Monday, 5 December 2011
Wishing you all a Merry Christmas and a Happy New Year


We are looking forward to welcoming you to our Spring 2012 User Group Meeting on the 20th of March 2012, and Seminar Day on 21st of March 2012.

If you would like to present a paper at the User Group Meeting, the agenda is almost finalised but there are still a few slots available. Please contact Steve Flood on 01752 691723 or sjf@dhigroup.com for more details.

For the Seminar Day, we would welcome suggestions for training content. For inspiration please see our latest DHI Training Course catalogue here http://courses.dhigroup.com/catalogue2011/ and the MIKE by DHI Software catalogue here http://www.mike-by-dhi.com/

Online booking will be available shortly, and you will receive an e-mail with the link soon.


Together with you, we contribute to solving the world's challenges in water environments


We at DHI believe that knowledge of water is necessary to support peaceful and sustainable development of societies.

Besides sharing our knowledge with our clients and partners, we specifically support women in developing countries in advancing their career opportunities in the management of water resources.

Read about the Women's Water Fund, and meet future water leaders from Asia and Africa.

Season's Greetings and Best Wishes for 2012

NB: The main photograph above shows Burrator Reservoir partly frozen with a reflection of Down Tor.

For (even!) more information about Burrator Reservoir please visit http://www.devonheritage.org/Places/Sheepstor/BurratorReservoir.htm (includes photographs taken during the construction of the dam), http://www.plymouthdata.info/BurratorReservoir.htm and http://www.swlakestrust.org.uk/conservation/projects/burrator-historic-and-natural-environment

Photograph Copyright © 2010 Graham Nathan. For use on this blog, the photograph has been restricted to a maximum resolution of 600 x 400 pixels. For full usage details please visit Media Stock (Front to Back Media Ltd) at http://www.mediastock.co.uk/digital-stock-photos.aspx and http://www.mediastock.co.uk/agreements/terms-of-sale-and-use.aspx
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The 2012 MIKE by DHI UK User Group Meeting will be held on the 20th March 2012 at the Lion Quays Waterside Resort, Oswestry.

The User Group Meeting will include a mixture of presentations of forthcoming software features and technologies, as well as practical case studies and papers presented by UK users.

On the following day, 21st March 2012, training sessions and specialised seminars will be held at the same venue.

Participation in the User Group Meeting is free of charge. The Training Sessions are also free of charge to UGM participants and will include hand-outs, lunch and coffee.

The programme is already filling up but if you would like to present a paper please contact us without delay. The draft agenda will be published in the January 2012 Newsletter.

For more information please contact: -
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Tuesday, 25 October 2011
The influence of land cover roughness on the results of high resolution tsunami inundation modelling

At the MIKE by DHI User Group Meeting held in Hamburg, Germany over the 24th - 25th May 2011, Dr. Andreas Kortenhaus from the Leichtweiß Institute for Hydraulic Engineering and Water Resources (TU Braunschweig), Dept. of Hydromechanics and Coastal Engineering, kindly delivered a presentation based upon research into the influence of land cover roughness on the results of high resolution tsunami inundation modelling.

This study has now been published and is available via the following link: -
Source dhi-wasy.blogspot.com (7th October 2011).
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The latest MIKE by DHI NetWork newsletter has been published, and contains the following articles: -

Main Article
Product News
  • MIKE by DHI 2011 Service Pack 6
Hints & Tips
Application Examples
Events & Courses
  • Feed-back from UGMs, Conferences and Seminars in 2011
  • Upcoming Events
  • Training
  • Feedback from training courses in 2011
  • Upcoming MIKE by DHI Training Courses
The newsletter can be viewed online here, or downloaded by clicking here.

Update - Revamped Publications Section & DHI Scribd channel

Please visit our revamped Publications section here. We’ve enriched the content with lots of useful material such as case stories and solution flyers – which are now accessible through our new Scribd Channel.

Click here
Follow us on our new DHI Scribd channel, to easily access and share our publications. Scribd, the world's largest social reading and publishing site, ensures widespread access to our documents and offers easy sharing functionalities.

Other News

To subscribe to the newsletter(s), please visit http://www.graphicmail.com/rwcode/subscribe.aspx?SiteID=3526&Mode=subscribe
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Sunday, 23 October 2011
Comprehensive Overview of MIKE SHE


Comprehensive overview of MIKE SHE by Douglas Graham (Oct 2011).

MIKE SHE Questions & Answers


MIKE SHE questions and answers; an interview with Douglas Graham (Oct 2011).

For more videos / animations please visit the DHI Group, MIKE by DHI and FEFLOW YouTube channels: -
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Monday, 10 October 2011
Release 2011 Service Pack 6

Service Pack 6 for Release 2011 is now available. Simply download and run SP6 from here or, alternatively, via the DHI Software Updater. Please refer to the release notes for information on the corrections made in Service Packs 1-6. If you have questions, please do not hesitate to contact the DHI UK support centre at mikebydhi.uk@dhigroup.com

To download Release 2011 Service Pack 6 please click below: -

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Tuesday, 27 September 2011
Example MIKE 21 Coupled Model to investigate swell wave propagation in the English Channel

Introduction

In February this year (2011) a large storm in the North Atlantic caused swell waves with periods of 20-25 seconds to propagate into the English Channel. Whilst this is not unusual in itself (beaches along the south coast have historically been subject to similar storms), the combination with high water of these small wave height, long period waves led to a series of flooding “near misses” along the South Coast as swell waves led to damage and overtopping of some defences including natural barrier beaches.

It is important to note that many of the beaches along the south coast are gravel/shingle dominated barriers which are typically considered reflective in morphological classifications (Short 1979). Greenwood (1984) noted that reflective beaches, which are already prone to sub-harmonic edge waves, can interact with longer period swell waves leading to an amplification of wave run up, a mechanism which leads to higher than anticipated overtopping and overwashing of the crest with consequent implications for barrier stability and hinterland flooding. With increasing emphasis from operating authorities being placed on beach management of such natural defences, it is important to understand the driving conditions in an event such as this to plan effective management.

With this in mind, DHI have developed a demonstration model of this event to show how the Flexible Mesh series of models allows you to take large scale North East Atlantic basin driving forces to understand the impact at a local scale. The coupled model developed makes use of the Spectral Wave and Hydrodynamic modules of the MIKE by DHI software and uses freely available data sources as inputs.

For this regionally focused modeling study, bathymetry data has been sourced from the GEBCO 08 Grid bathymetry data set which provides a 30 arc-second grid of the entire globe. Tidal data was obtained from the MIKE 21 toolbox to allow the flow model to be adequately resolved.

In addition the driving forces of the storm in the North East Atlantic needed to be represented. For this the NOAA/NCEP reanalysis data was used. This data set can provide driving wind fields and pressures for the entire globe and a temporal and spatial subset was utilized for this demonstration. The NOAA/NCEP reanalysis data is 6 hourly at a spatial resolution of 2.5 degrees. Available pressure charts from the UK Met Office provide a validation of the data set used as seen in Figure 1 below.


Figure 1 – Met office and NOAA/NCEP reanalysis data used as forcing conditions for the model.

The mesh used for the modelling was optimized to provide a suitable representation of the features of interest in the storm and whilst starting out as a mesh of the entire North Atlantic for the entire duration of the storm system, this was reduced to a smaller North-East Atlantic model for a period including 3 days prior to the storm striking the South coast of the UK. This was to enable the wave model to be run in fully spectral mode, the most suitable for allowing the wind/wave generation and transport process to take place and at a computational speed that would be achievable for operational forecasting models (~1-2 hour model run times for combined wave and flow conditions).
Monday, 26 September 2011
Hands on FEFLOW training 26th – 27th October 2011

ESI, in conjunction with DHI-WASY, have announced a 2 day FEFLOW training course in Shrewsbury on 26th and 27th October 2011 aimed at giving both an insight and training into the effective utilisation of FEFLOW simulation modelling software: -
  • Hands on introduction to modelling with FEFLOW: 26th October 2011
  • Focus on FEFLOW modelling for Ground Source Energy: 27th October 2011
FEFLOW is a finite element software package for modelling fluid flow and transport of dissolved constituents and/or heat transport processes in the ground. The finite element discretisation enables the user to build complex unstructured meshes that closely match natural structures.

More information and booking details: -
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Monday, 19 September 2011
Modelling to support the Water Framework Directive and integrated catchment management

15 November 2011, 10am – 4pm
The Geological Society, Burlington House, London

The Water Framework Directive is a key driver of environmental management with its fundamental objective to maintain, and prevent the deterioration of, surface water and groundwater quantitative and qualitative “high status”. This requires that EU Member States ensure that a co-ordinated approach to water management is adopted. As part of this, better conceptual and mathematical models are required to assess the impact of any proposed changes in catchment management on, for example, groundwater and surface water quality. Such modelling will inform catchment management and policy but is only likely to be effective if deemed to be valid by all of the relevant stakeholders.

Aims of the workshop

This workshop will explore these issues by considering what the current gaps in knowledge are, what existing methods and models are useful for integrated catchment management, what improvements in conceptual and numerical modelling are required, and how models can provide evidence to stakeholders to support changes in management practice. The meeting will focus on these challenges within the context of the DEFRA Demonstration Test Catchments initiative and agricultural diffuse water pollution.

Full details and booking form:
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Friday, 9 September 2011
Animated visualization of a 3D groundwater model for a flooded salt mine (Stereoscopic 3D)


To turn off stereoscopic 3D, click the red '3D' icon on the bottom navigation bar while the animation is running.

Objective of the project

Using the abandoned and flooded historical salt mine located near Staßfurt, Germany, as a case study, improve the general knowledge of the dynamics of naturally or intentionally flooded salt mines.

Approach

A regional three-dimensional mass-transport FEFLOW® model was built for the project area, including detailed 3D geometric schematizations of the mine workings.

In addition two-dimensional type-models were computed, for instance to study chemical reaction kinetics, where NaCl and MgCl2 represent the dominant salt species. Precipitation and dissolution are controlled by the amount of available MgCl2, due to this the bulk density is affected. Furthermore, permeability and porosity are also modified dynamically by precipitation and dissolution.

Benefit

Applying the FEFLOW® model it could be shown that the relevant processes in a flooded salt-mine can be modelled, precipitation and dissolution reactive processes for multi-species and multi-density processes can be modelled in type models, using the advanced visualisation possibilities of FEFLOW 6 the set-up of such a model can be speeded up, runtimes can be kept reasonably short by using parallelization.

Potential Applications

Mine flooding can not only alter underground hydrogeology, but also cause the collapse of mine workings (potentially exacerbating groundwater related flooding elsewhere), ground subsidence and damage to surface structures both in the mine and in the surrounding area. FEFLOW can be used to model the long term performance of flooding control measures, as well as dewatering works, in operational and abandoned mine workings - particularly important where rock formations are highly prone to chemical attack and erosion (e.g. gypsum mines). FEFLOW can also be used to validate remediation schemes for groundwater contaminated by mining activity.

For more information, please visit http://www.feflow.info/
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Thursday, 8 September 2011
WEST – Modelling Wastewater Treatment Plants

WEST is a powerful and user-friendly tool for dynamic modelling and simulation of wastewater treatment plants. The extensive state-of-the art model and process library of WEST allows users to model and evaluate almost any kind of modern wastewater treatment plant. WEST is specifically designed for engineers and professionals who want to simulate processes where physical, biological or chemical processes are interlinked to test different scenarios and to assess the treatment efficiency as well as operational cost.

Following the recent bankruptcy of MOSTforWATER, DHI has taken over selected assets from the estate - including all rights to WEST. DHI sees WEST as an important addition to the MIKE by DHI family – an addition which complements our product family in an important and growing market area.

DHI continues the on-going development of WEST as planned and will continue to offer WEST users high quality technical support and training similar to any other MIKE product.

The upcoming release of WEST is planned for October 2011 and will include significant new features and improvements, such as: -
  • Faster and more user-friendly interactive layout editing
  • New model editor providing: syntax-aware MSL model editing, Gujer matrix editing, and model library browser
  • 5 new experiment types: uncertainty analysis, scenario analysis, local sensitivity analysis, global sensitivity analysis, and parameter estimation
After the release in October 2011 WEST releases will be synchronized with the general MIKE release schedule, implying that the following release is scheduled for end of Q2 2012.

As the leading provider of advanced software tools for the industry DHI is convinced that WEST provides a valuable expansion to the MIKE by DHI product line to the benefit of both MIKE and WEST users who now can look forward to further integration and broader service offerings from DHI.

DHI will provide customer support and training for WEST users through its current global network of offices and network.

For more information, please contact Morten Rungø by e-mail at mor@dhigroup.com, or visit http://www.mikebydhi.com/Products/Cities/WEST.aspx
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Sunday, 14 August 2011
Safe embrace: Supporting local fisheries with innovative harbour design

What’s a fisherman without a safe harbour to come home to? In Hvide Sande on Denmark’s western coast, the local fishermen are facing a problem: their harbour entrance is not only too shallow for modern fishing vessels but regularly obstructed by sediment, some times for weeks at a time. DHI applied its modelling tools for a new design of the harbour’s entrance and to plan the accompanying dredging activities.

Aerial view of Hvide Sande Harbour with the
current harbour design.
Hvide Sande is a picturesque fishing village on Denmark’s exposed North Sea coast with little more than 3000 inhabitants and approximately 60 fisheries vessels. Fishing is a major source of income, for the fishermen themselves and the associated processing industry as well as a major attractor for the tourism sector.

However, Hvide Sande Harbour faces some problems. The natural depth of the sand bars bypassing the harbour is only 2.5 metres, not sufficient to accommodate today’s fishing vessels that require a minimum depth of 6.0 metres. Moreover, heavy sedimentation in the harbour’s access channel, especially following storm events, hampers the safe passage of vessels and ships. Therefore, the authorities wished to increase navigation depth in front of the harbour while at the same time reducing sedimentation in the access channel.

In an innovative approach, DHI managed to solve all these problems in one go. DHI’s concept consists of a combination of new protective breakwaters, embracing the harbour entrance, and capital dredging of the coastline north of the harbour, where the deposited sediment usually originates. The streamlined breakwaters result in an increased flow velocity past the harbour mouth, thereby reducing sediment deposition in that area. Dredging of the coastline in the updrift area further helps to maintain the required water depth. The approach builds on a combination of DHI’s advanced morphological modelling tools and a large set of field data: Hourly wave, wind and water level measurements, as well as weekly soundings of the harbour access channel, allowed for a thorough calibration and validation of the models.

As a result, Hvide Sande Harbour is spared double trouble. DHI’s solution significantly reduces dredging requirements as well as downtime due to inaccessibility of the harbour. The effect is far-ranging: In the new harbour, fish can be landed during all weather-conditions, guaranteeing the supply of local fresh fish. Fishermen do not need to find another harbour to land their fish, saving them precious time and money. All in all, the new harbour, under construction as of June 2011 and scheduled to be completed by fall 2012, will help to maintain a small fishing community in a rural environment, receiving the local fishermen in its safe embrace.

Compare the old and the new harbour design, and see the resulting changes in the navigation channel: -



The layout of an old breakwater results in blocking of the access channel by a sediment bypass bar with a crest at a depth of 2.5 m. Maintenance dredging of the bar is required to ensure a safe navigation depth of 4.5 m (Long-term morphological modeling performed with MIKE by DHI software).



A new breakwater layout 'designed by DHI' results in a 2 m increased depth of the sediment bypass bar and an improved natural bypass of sediment transport. Maintenance dredging of the bar is no longer required to ensure a safe and sustainable navigation depth of 4.5 m (Long-term morphological modeling performed with MIKE by DHI software).

Article taken from www.dhigroup.com
For more information, please contact Nicholas Grunnet by e-mail at ngr@dhigroup.com
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Tuesday, 9 August 2011
3D Visualisation of a Regional Groundwater Model in FEFLOW


Stereoscopic animation of a three-dimensional regional groundwater model in FEFLOW (www.feflow.info).

NB: To turn off stereoscopic 3D, click the red '3D' icon on the bottom navigation bar while the animation is running.

Visualisation of Contaminant Transport in FEFLOW


Animation of flow and contaminant transport simulation in FEFLOW (www.feflow.info).

For more videos / animations please visit the MIKE by DHI and FEFLOW YouTube channels: -
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Monday, 11 July 2011
MIKE FLOOD Mass Balance Check

Periodically, it is useful to perform a mass balance verification to make sure that the total volume of water entering and leaving the model at the upstream and downstream boundaries balances the quantity of water remaining in the model domain at the end of a simulation.

The calculation of mass balance is quite simple in MIKE 11 (1D only) and MIKE 21 (2D only) but a number of steps are currently required to perform the calculation in MIKE FLOOD (1D / 2D). An automated MIKE FLOOD water balance calculation (that sums the mass balance contributions from MIKE 11, MIKE URBAN and MIKE 21) is currently in development for the 2012 Release.

Several methods / tools can be used to calculate mass balance. The examples below showcase lesser known features of MIKE View and the MIKE Zero Grid Series Editor.

Assuming ∑Q_in = ∑Q_out + ΔM11_vol + ΔM21_vol

Calculate ∑Q_in and ∑Q_out using MIKE View

Launch the standard MIKE 11 results file (*.res11) in MIKE View. Choose the 'Select Gridpoints' icon or 'Plot > TS in Grid Points...'. Select 'Discharge' as the Data Type, then click 'OK'. Choose the Q-points nearest the inflow boundary to generate a Time Series Discharge plot. Right click anywhere within the plot, choose 'Accumulated Values...', then click 'Calculate'. Make a note of the accumulated discharge (m3).

Repeat for all remaining inflow / outflow boundaries.

Calculate ΔM11_vol using MIKE View

NB: Add 'Volume' results to the 'Add. Output' tab of the MIKE 11 HD Parameter file prior to running the MIKE FLOOD simulation.

Launch the additional MIKE 11 results file (*HDAdd.res11) in MIKE View. Choose 'Plot > TS of System Data...'. Select 'Volume' as the Data Type, then click 'List'. Select 'Volume, Total Volume', the click 'Show Values'. Make a note of the volumes at the start and end of the simulation.

ΔM11_vol = M11_endvol - M11_initialvol

Calculate ΔM21_vol using MIKE Zero Grid Series Editor (MIKE FLOOD 'Classic')

Launch the H,P,Q MIKE 21 results file (*.dfs2) in the Grid Series Editor (right click the results file in the Project Explorer and select 'Open With...'). Choose 'Tools > Calculate Statistics...'. Select 'Sub-Set' and navigate to the end of the simulation, then click 'Select Current'. Select the 'Statistics' tab, then make a note of the Mean Value (average water depth), the Number of Points and the model resolution (Grid spacing).

M21_endvol = H_mean * N_wetpoints * Δx * Δy

Repeat for initial volumes if applicable.

ΔM21_vol = M21_endvol - M21_initialvol

Open MIKE 21 boundaries add complexity but can be considered using the MIKE 21 Tool for Discharge Calculation (New File > MIKE 21 > MIKE 21 Toolbox > Hydrodynamics > Discharge Calculation).

For more information, please see the document 'MIKE 21 FLOW MODEL: HINTS AND RECOMMENDATIONS IN APPLICATIONS WITH SIGNIFICANT FLOODING AND DRYING' here http://www.mikebydhi.com/upload/dhisoftwarearchive/papersanddocs/hydrodynamics/MIKE21SignificantFlodryGuidelines.pdf

As a general rule of thumb, mass errors should be less than 2%. If the mass error is greater than 2%, the cause and location of the mass error within the model schematisation should be identified and the consequence of this error assessed and improvements to the model considered. If the mass error is greater than 5%, then it suggests that the model schematisation is not robust and needs to be reviewed (Ref: Fluvial Design Guide).
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Thursday, 23 June 2011
Innovative use of MIKE by DHI for morphological evolution of coastal defences

Introduction

For many years numerical models have been able to accurately represent the flood water inundation, and associated flooding risk, resulting from the failure of flood defences. Such failures are often simply described within numerical models as static ‘openings’ in defences, with little or no consideration given to morphological change and the development of a breach over time as a result of various natural processes.

In the UK, funding for new flood and coastal defences is becoming harder to attain. As such, an increasing reliance on natural defences is highly likely, augmented by the optimisation of existing flood defence structures and innovative low impact solutions that work with our natural environment.

DHI is committed to delivering a range of tools that consider the morphological evolution of coastal defenses acted upon by natural processes of storms, waves and tides, exacerbated by our changing climate. The examples below present upcoming new features in MIKE 21/3, as well as recent projects.

MIKE FLOOD (our complete 1D-2D integrated flood modelling package) is already able to represent changes to levees over time and, coupled with the new MIKE FLOOD Dynamic Hazard Mapping module, the new features and technologies presented below will further enhance the MIKE by DHI total solution capability.

Wave Overtopping and Erosion of Sandy Barriers

Work is progressing to adapt DHI's classic Boussinesq type wave model (MIKE 21 BW) to consider the overtopping and erosion of sandy barriers; linking wave run-up, overtopping and lee side down-rush to the morphological evolution and potential breaching of coastal defences.


Overtopping of a uniform alongshore barrier

The present animation (above) shows results from an in-house version of MIKE 21 BW that is currently being developed under the research programme COADAPT funded by the Danish Strategic Research Council.

The animation shows that bathymetric irregularity can have a significant effect on the rates and location of overtopping; in this case, a depression / channel within a submerged off-shore sand bar predicts higher risk of wave overtopping of the barrier just shoreward of the depression.

The model can be used to predict the risk of flooding, as well as the vulnerability of softer defences, to the impacts of climate change and to guide prevention against flooding in a cost effective way.

Dynamic Dam / Dune Break & Morphological Seabed Change

We will soon be introducing a new feature into our MIKE 21/3 Flexible Mesh Series models enabling the dynamic update of a model bathymetry during a simulation (the feature works on element based topography; i.e. dfsu files).

In this example, the new MIKE 21/3 Dynamic Bathymetry Update feature has been employed to consider a breach through an alongshore dune.

Model set-up of dune break through


Flood water inundation resulting from dune break through

The animation above shows a dune break during a 40 hour storm, and the resulting inland flooding as a consequence of the failure.


Section through a breach in the direction of flow

The animation above shows morphological change during the critical erosion phase of a levee failure, and the consequential change in water level.

The model can be used to generate flood inundation and flood hazard maps, to inform emergency planning and evacuation procedures (including early warning systems), and to develop the design of remedial or preventative measures.

Erosion of Soft Cliffs

DHI’s work on the Femern Belt project (a 20 km long connection between Denmark and Germany) includes the design of 2.3km2 artificial landscape with beaches, bays, lagoons and active cliffs; created from material reclaimed from dredging operations for the preferred tunnel option.

The artificial cliffs will be established with the purpose of slowly releasing loose material to the down drift eroding coast line. The first estimates of expected retreat rates have been based on observed retreat rates at similar but natural cliffs.

Femern Belt project (Design group: Rambøll/DK, Arup/UK and TEC/NL, with DHI and Schønherr/DK as sub-consultants)

Cliff erosion is typically connected to events of high water levels and severe wave action. However, depending on the porosity of the cliff, the content of water in the cliff may also provoke collapse. Empirical methods are generally employed for the quantification of cliff erosion. However, the use of MIKE 21/3 for hind casting of waves and water levels could be relevant to assist in an analysis of erosion rates compared to the exposure.

For more information, please visit http://bit.ly/iOyVUr and http://www.femern.com/

Potential Applications for the Above Examples
  • River embankment breach and evolution
  • Dam embankment breach and evolution
  • Reliability of and failure consequences for soft coastal defences
  • Application to soft cliff erosion
  • Managed realignment schemes and removal of hard defences
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Wednesday, 22 June 2011
Release 2011 Service Pack 4

Service Pack 4 for Release 2011 (NB: Service Pack 5 for MIKE GIS 2011) is now available. Simply download and run SP4 from here or, alternatively, via the DHI Software Updater. Please refer to the release notes for information on the corrections made in Service Packs 1-4. If you have questions, please do not hesitate to contact the DHI UK support centre at mikebydhi.uk@dhigroup.com

To download Release 2011 Service Pack 4 please click below: -

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Breach Modelling in Bermondsey, London, UK by RPS

RPS is an international consultancy providing advice on the development of natural resources, land and property, the management of the environment and the health and safety of people.

RPS offices across the UK utilise the MIKE by DHI software on a daily basis for a variety of projects. In this example, the Bristol office was engaged to undertake breach modelling at the site of a proposed residential development in the Bermondsey area of London. The SFRA (Strategic Flood Risk Assessment) for the area gave a highly conservative breach flood extent and flood water level. A more realistic level was required to inform the minimum elevation at which residential development could take place. A detailed breach model was constructed in MIKE 21 to establish the 1 in 200-year tidal flood level at the site.

Five breach locations were selected along an adjacent stretch of the River Thames, each breach was 20m wide (in accordance with current guidance for a tidal river with hard defences), as shown below.

Breach Locations

A 24 hour tidal cycle was run through each breach based upon the 1 in 200-year peak tidal level. The following animation shows the final, predicted breach flood extents. None of the modelled breaches impacted the site permitting residential development at ground floor level, significantly increasing the profitability of the site.


Maximum Flood Depths (m)

The Environment Agency reviewed and accepted the findings of the MIKE 21 breach modelling, and deemed it conservative enough to offset any model uncertainties. The model findings have subsequently been used by other developers to the same effect; clearing other sites in the area from flooding as a result of a breach in the defences and allowing the sites to be developed for residential development at all levels.

RPS has also carried out more detailed modelling on the Isle of Dogs that is to be used in a similar fashion. Additionally, RPS regularly utilises MIKE 21 and MIKE FLOOD for local overland flow modelling for large and small scale developments as well as for coastal defence failure / overtopping scenarios.

For more information, please contact Daniel McLeish at RPS by phone on +44 (0)1454 853 000, e-mail daniel.mcleish@rpsgroup.com, or visit http://www.rpsgroup.com/

Maps and animations contain Ordnance Survey data (C) Crown Copyright and Database Right 2011
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Blog Update

A new static page has been added - accessed via the top menu bar - providing full contact details for UK 'Support Desk' enquiries. Please use our new mikebydhi.uk@dhigroup.com e-mail address for all UK specific support questions. Thank you.

Note: The image here is a photograph of Smeaton's Tower, The Hoe, Plymouth, Devon, UK. For information, please see: -
1) http://en.wikipedia.org/wiki/Smeaton's_Tower
2) www.plymouth.gov.uk/homepage/creativityandculture/museums/museumsmeatonstower.htm
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Tuesday, 3 May 2011
Applications of MIKE FLOOD in the UK by Waterco

Waterco are experienced MIKE 11 and MIKE FLOOD users, and strong advocates of the MIKE by DHI suite of integrated water modelling software tools. Waterco have been successfully employing both MIKE 11 and MIKE FLOOD, for more than five years, to undertake the modelling and assessment of flood risk in England and Wales. The animations below showcase the use of MIKE Animator to effectively communicate flood risk, from a number of different sources, to both Local Planning Authority and private clients: -
  • Coastal breach assessment
  • Integrated 1D / 2D fluvial floodplain model
  • Urban flooding due to blocked culvert
  • Integrated 1D / 2D river model
  • Pluvial / surface water flooding


Project animations prepared by Waterco using: -

For more information, please contact Chris Lewis at Waterco by phone on 01824 702220, e-mail Chris.Lewis@waterco.co.uk, or visit http://www.waterco.co.uk/

UPDATE: For more examples of MIKE 11, MIKE 21 and MIKE FLOOD applications please see Waterco's YouTube channel here http://www.youtube.com/WatercoLtd
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Release 2011 Service Pack 3

Service Pack 3 for Release 2011 now is available. Simply download and run SP3 from here or, alternatively, via the DHI Software Updater. Please refer to the release notes for information on the corrections made in Service Packs 1-3. If you have questions, please do not hesitate to contact the DHI UK support centre at mikebydhi.uk@dhigroup.com

To download Release 2011 Service Pack 3 please click below: -

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Tuesday, 12 April 2011
Blog Updates

A new static page has been added - conveniently accessed via a new top menu bar - to serve as a record of the successful 2011 DHI UK User Group Meeting. If you presented a paper at the UGM and would like to make your presentation available for download though this dedicated page, please e-mail a PDF version to sjf@dhigroup.com

'Follow me' buttons have been added to the right sidebar to enable you to join DHI on Facebook, Twitter and YouTube.

Note: The main header image is a photograph of Burrator Reservoir, Dartmoor, Devon, UK. For information, please see: -
1) www.swlakestrust.org.uk/conservation/projects/burrator-historic-and-natural-environment
2) www.plymouthdata.info/BurratorReservoir.htm

Testimonials / Success Stories

If you would like to have your MIKE project to be showcased on the Blog, and considered for inclusion on the main MIKE by DHI website as a Success Story, please contact Steve Flood on 01752 691723 or sjf@dhigroup.com
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Tuesday, 22 March 2011
A MIKE 21C Concept Demonstration: Is it Possible to Model the Impact on Flood Risk due to the Morphological and Planform Change of a River over the Lifetime of a Development?

Introduction

In the UK, flood risk and where necessary mitigation must be considered throughout the design life of the development. For the purpose of this example, a design life of 100 years (i.e. minimum lifetime of a residential development from PPS25) has been used.

‘For practical reasons it is difficult to define the lifetime of development as each development will have different characteristics. For guidance, residential development should be considered for a minimum of 100 years, unless there is specific justification for considering a shorter period. An example of this would be if the development was controlled by a time limited planning condition.’ (PPS25 Practice Guide)

The primary long term factor affecting river hydrodynamics, and flood risk, is climate change. However, the consideration of other factors may also be critical.

While it is commonplace to model the physical changes to a watercourse or flood plain as a result of urbanisation (e.g. introduction of culverts, flood defences, etc), morphological change is usually limited to the consideration of scour or silting (e.g. blockages) at structures, and to develop river maintenance schemes. Generally, for flood modelling, river bed and channel form are fixed (excepting the development of breaches).

What is MIKE 21C?

MIKE 21C is a special module of MIKE 21 based on a curvilinear (boundary-fitted) grid, which makes it suitable for detailed simulation of rivers and channels, where an accurate description of bank lines is required. MIKE21C is particular suited for river morphological studies and includes modules to describe: -
  • Flow hydrodynamics
  • Helical flow (3D secondary currents)
  • Sediment transport
  • Alluvial resistance due to bed material and bed forms
  • Scour and Deposition
  • Bank erosion and planform changes
The bank erosion is computed from a formula relating near-bank conditions to bank erosion rates. The accumulated bank erosion can be used for updating the bank lines, and for updating the curvilinear grid (extent of the modelling area) at every time-step. The bank erosion products can be included in the sediment budget for the adjacent riverbed, or it can be disregarded depending on the composition of the bank material.

The modules can run interactively, incorporating feedback from variations in the alluvial resistance, bed topography and bank line geometry to the flow hydrodynamics and sediment transport.

Notes on the Model Set Up

Grid (see right for extract).

HD: Constant representative inflow, constant downstream water level and constant resistance (i.e. the only factor affecting hydrodynamics is morphological change).

ST: Single sediment component (grain size ~ coarse sand). Meyer-Peter and Muller transport theory employed.

Morphological Update: Single layer model (initial bathymetry comprises a uniform bed with sloping banks).

Planform: Erosion = Constant * (V – Vmean). Two eroding banks, the bank erosion model uses Erosion – Accretion = 0 (other models are available).

Model Results


Development of point bars and bend scour is clearly evident (above).

Results can be used to assess the impact on flood inundation modelling. If necessary, it is possible to ‘burn’ the original and updated channel grids into the bathymetry of a MIKE FLOOD / MIKE 21 model, in order to consider changes in flood depths and velocities in the wider floodplain. This is particularly important where water levels in the channel indicate that flood waters may find future overland flow routes that were previously dry (i.e. outflanking of existing defences).

Results can be used to inform the design of any flood defences or bank stability assessments, and to assess the effectiveness and impact of erosion control structures (hard / soft engineered) on future habitats (e.g. fish spawning grounds).


Sudden morphological change (as a result of significant flood event, dambreak, etc) is also possible.

Important considerations

Morphology introduces another level of uncertainty. The undertaking of sensitivity checks / range of scenarios is extremely important; particularly when attempting to predict long term morphological and planform change of a river.

Many more layers (representing varying soil parameters) will likely be required in the morphological model, and detailed geotechnical investigations of the bank and bed materials will be required. Such investigations should, as a minimum, be informed by river / walkover surveys.

Calibration is critical!
  • Gauged river flows and meteorological data (for long range flow forecasting and performance monitoring)
  • Historic maps & aerial photos (for preliminary assessment of river movement)
  • Topographic survey data and spatial monitoring points (ongoing morphological monitoring)

MIKE 21C is generally used in larger rivers (possible scaling issues).

MIKE 11 or MIKE 21 FM will be suitable for most usual riverine sediment transport applications but planform change can only be modelled using MIKE 21C.
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Sunday, 6 March 2011
The 12th MIKE by DHI UK User Group Meeting at the Lion Quays Conference Centre
Tuesday 8th and Wednesday 9th March 2011

The User Group Meeting is now just a few days away. It is NOT too late to join us for this exciting FREE event!

The UGM is free of charge and open to both users and potential users alike. If you would like to find out what the DHI e-Community are doing, and what DHI are planning for the future, please join us on the 8th March.

There is 'something for everyone' in the Agenda.

Thursday, 17 February 2011
Release 2011

MIKE by DHI 2011 - Better than ever

The 2011 version of MIKE by DHI software is now officially released! Release 2011 is continuing our efforts toward greater usability, flexibility and seamless integration.Yet again many new important features have been added and likewise significant performance improvements have been made, which will further help our users and inevitably push the boundaries of modelling even further. Release 2011 will undoubtedly help the MIKE by DHI users win and complete even more projects successfully.

For more information - including Release flyers - please click here

To download Release 2011 please click below: -

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Tuesday, 8 February 2011
The 12th MIKE by DHI UK User Group Meeting at the Lion Quays Conference Centre
Tuesday 8th and Wednesday 9th March 2011

DRAFT AGENDA – UGM Tuesday 8th March

In addition to the user presentations, we will be detailing the new features and technologies available to you in MIKE by DHI Release 2011, as well as outlining our future plans for the software portfolio.

We will divide into two 'Tracks' for the different Product Area 'Technical' Sessions and re-join for a 3rd 'Common Interest' Track on Environmental Issues.

On the following 'Training Day' there is a choice of three separate Tracks with a choice of three different 'inset' sessions which can be mixed and matched according to your requirements…

Example tidal inundation model at Sutton Harbour, Plymouth using standard structures available within MIKE 21 Flexible Mesh

Introduction

The Sutton Harbour area of Plymouth is defended against tidal flooding primarily by a system of lock gates at the entrance to the inner harbour. It is understood that the defended level afforded by the lock gates is 4.03m A.O.D (although a number of openings in the parapet wall of the southern harbour wall may slightly compromise the level of defence). This example investigates the suitability of the existing defences to accommodate a 1 in 200-year tidal event plus an allowance for climate change.

Additional notes: It is assumed that all surface water outfalls into the inner harbour have been bypassed; hence, flooding from urban drainage has been ignored. No assessment of wave height has been included within this example. The aerial photograph above was obtained from the Channel Coastal Observatory Data Catalogue (see below).
LIDAR data, for use in the model, was obtained from the Channel Coastal Observatory Data Catalogue here http://www.channelcoast.org/. Downloading data and reports from the Channel Coastal Observatory Data Catalogue is currently free of charge (registration is required).

Additional notes: CCO LIDAR data was verified by comparison with EA LIDAR data and augmented by additional depth values.
Thursday, 3 February 2011
Cities

Release 2011 of MIKE URBAN is another significant milestone. Important new features have been added that further support the work flow, increase your productivity and set new standards for what can be done in urban water modelling.

Water distribution

Release 2011 is another need-to-have release for water distribution modellers. A range of new features to enhance the usability have been implemented such as:

1 Pressure dependent demands
Traditionally, water demands are defined prior to the simulation and thus independent of the actual pressure. With Release 2011, the Wagner equation can be used to adjust the node demands based on the available pressure. This makes it possible to simulate system shutdown, maintenance and intermittent water supply systems.

2 Reliability analysis
The Reliability Analysis Tool allows you to analyse hydraulic and water quality results of any steady state or extended period analysis and to investigate the reliability in terms of exceeded maximum and/or minimum values of pressures, flows, water quality, or any other result item.

Simplification tool

The simplification tool has been enhanced to include:
  • The choice of what not to simplify
  • Change in flow direction as a new pipe-merge criteria
  • Easy comparison of results from detailed and simplified models
  • Detailed summary reporting on what has been merged and removed
  • Saving simplification settings in a file
  • Batch execution of multiple simplifications based on several settings files
Tools for Building and Maintaining Models

Release 2011 of MIKE URBAN includes three new tools to increase your efficiency when building and maintaining models:

1 Database comparison and redoing modifications
This tool will report on differences between two MIKE URBAN databases. Records that are different will be reported as changed, deleted or added. For records which have changed, the attributes that are different will be highlighted. The differences can be saved to a file, which can be used to automatically redo the changes at a later stage, eg when redoing modifications after import.

2 Combining detailed and simplified models
This tool can be used to combine a detailed and a simplified model into a mixed model with both detailed and simplified areas.

3 Comparing results between models
With this tool you can compare two sets of model results at selected locations in batch mode.

Boundary Display in Map View

Boundary conditions are displayed in the map view including: discharge and water level boundaries in MOUSE and SWMM models, rainfall, temperature, evapotranspiration in catchments, as well as water demands in WD models.

Generic Features

Amongst the new generic features in 2011 in particular the climate change tool adds value for MIKE URBAN users. This tool provides climate model output (approved by IPCC) and applies these to make climate change assessment through automated modification of boundary conditions.
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Tuesday, 1 February 2011
The 2011 DHI UK User Group Meeting will be held over the 8th and 9th March 2011 at the Lion Quays Waterside Resort, Oswestry...

The full agenda for the User Group Meeting, on the Tuesday, is currently being finalised (please see http://www.mikebydhi.com/Events/UKUGM12.aspx for up to date details). Confirmed user presentations / papers currently include: -
  • '3D modelling of Southampton Water' by URS-Scott Wilson
  • 'Ground Source Energy Schemes in London' by ESI
  • 'The future of modelling at the UK Environment Agency' by the Environment Agency
  • 'Tywyn Coastal Process Assessment: Application of detailed numerical modelling tools for design optimisation' by Atkins
  • 'Water Environmental Modelling Using Mike 21 – to assist engineering design' by Arup
  • 'Real-Time Surface Water-Groundwater Modeling in the Big Cypress Basin, Florida' by DHI Inc
Also planned are user presentations covering Estuarine Modelling, Fluvial Geomorphology and Ecology, Flood Defence Techniques, and Hazard Mapping. The programme is almost full but, if you would like to present a paper, please contact us without delay.

In addition to the above user presentations, Jørgen Bo Nielsen (Managing Director of DHI Software Products) will deliver a keynote speech entitled 'DHI - Product Evolution & Innovation'. We will also be detailing the new features and technologies available to you within the forthcoming MIKE by DHI Release 2011, as well as outlining future plans for our software.

It is envisaged that, on the Wednesday, the training sessions will cover: -
  • Coast & Sea: Extended news and selected features, plus Tips & Tricks and Examples.
  • Flooding: Preparation of MIKE 11 river models for use in MIKE FLOOD, plus Tips & Tricks (e.g. MIKE 11 Structures) and Application examples (e.g. NAM).
  • Water Resources: Integrated Hydrology and Groundwater Modelling Introduction, and Application Examples.
There is still time to include other topics if required! Please let us know if you have any requests and we will endeavour to accommodate them.

A ‘drop by’ room is planned which would include a short MIKE FLOOD modelling introduction seminar, together with demonstrations of other new technologies. We are also planning to arrange 'meetings' for those delegates arriving on Monday afternoon (7th March), more on this to follow.

For further details and to book your place online please click below: -


You MUST confirm & pay for your overnight room requirements direct with the Lion Quays. Please book you hotel requirements before 14th February to guarantee your room. This year we have an 'economy option' of a room at a nearby hotel, but with breakfast and lunch at the Lion Quays.
For more information please contact: -
Thursday, 20 January 2011
Coast & Sea

LITPACK Redesign

Release 2011 includes a complete redesign of LITPACK, the modelling package for coastal sediment transport and morphology. The redesign includes:
  • A new user interface
  • Common setup file for all LITPACK modules
  • Flexible definition of input values (constant/time varying/spatially varying)
  • User specification of output parameters
  • Graphical view of setup in georeferenced domain
  • Additional functionality, e.g. calculation of Q-Alpha curves
  • Improved Rose Plot: 3rd item defines duration of event
  • Improved Profile Editor: Georeferenced line series data
  • Improved Project Map: Line series display included

The redesign is a step towards integration in the coupled MIKE 21 FM.

Cyclone Tool

The MIKE 21 toolbox includes a tool for computing wind and pressure fields generated by a cyclone, hurricane or typhoon.

The old Cyclone Tool uses a parametric model developed in the early 1980s that in some cases overpredicts winds.

In Release 2011, several newer parametric models of the cyclone process have been added.

MIKE 21 SW

The Spectral Wave module includes numerous improvements:
  • Significant performance improvement by domain decomposition
  • Improved convergence of quasi-steady component
  • Output of wave power
  • Improved description of structures

MIKE 21/3 FM Improvements

Apart from the significant speed improvements, several other new features are included in Release 2011:
  • Dynamic update of bathymetries (for dam/dune breaks, morphological seabed changes)
  • Improved description of velocity profiles in river simulations

Particle Tracking and New Oil Spill in FM

Release 2011 also includes an improved Particle Tracking module for the FM series. The module includes added features and larger flexibility in terms of output and functionality.

Now the FM series also includes an oil spill module with the same backbone as the Particle Tracking module.

Mesh Generator Enhancements

The new version of the Mesh Generator tool includes several major enhancements including:
  • Handling of large scatter data,
  • Performance improvement for editing and interpolation in large scatter data sets, and
  • Prioritisation of scatter data
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Welcome to DHI UK

DHI is an independent, international consulting and research organisation with the global objective of advancing technological development and competence with respect to water, in all of its environments.

Worldwide, we offer a wide range of consulting services and leading edge technologies, software tools, environmental laboratories, and physical model test facilities, as well as field surveys and monitoring programmes. Designated as a not-for-profit organisation, DHI is able to invest a considerable portion of its resources in research and development. Today we co-operate with many Universities, and research organisations, and are recognised globally for our innovation and expertise.

In the UK, DHI offers niche or specialist consultancy services in the water and environment market to government agencies, commercial entities and selected research organisations. We fulfil a research based specialist advisor role; a ‘Consultant to the Consultants’. We also supply and support the renowned MIKE by DHI suite of integrated water modelling tools.

MIKE by DHI software is the result of years of experience and dedicated development and has, in many regions, become the standard modelling tool. It transforms our science into practice and gives you the competitive edge and, through the DHI Academy, you can rest assured that there is a local team of highly skilled experts committed to train and support you every step of the way.

MIKE by DHI truly models the world of water - from mountain streams to the ocean and from drinking water to treatment plant and beyond.

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