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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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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