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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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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