Event Title

Session E1: Hydrodynamics within a Fish Migration River Between Saline and Fresh Water

Location

Groningen, The Netherlands

Event Website

http://fishpassage.umass.edu/

Start Date

22-6-2015 11:40 AM

End Date

22-6-2015 11:55 AM

Description

Abstract:

The presentation addresses the preliminary design of a fish migration river between the saline Dutch Waddensea and the fresh water lake IJsselmeer. An important constraint is that there should be no leakage of saline water from the Waddensea to lake IJsselmeer since this lake serves a fresh water reservoir for the northern part of the Netherlands. However, the fish migration river should provide a sufficient lure stream, increased levels of fresh water odeurs, in the Waddensea allowing fish to find the entrance of the fish migration river. In addition, the tidal range within the fish migration river should preferably allow for the development of brackish inter tidal areas

In our study we used a 1-dimensional hydrodynamic model (SOBEK) in combination with a 3-dimensional hydrodynamic model (Delft3D-Flow) of the fish migration river. These models compute water levels, flow velocities and salinities within a schematized fish migration river. The 1-dimensional model, due to its limited computational time, served as a “quick-scan”

model allowing many iterations (scenario simulations). The 3-dimensional model, requiring much more computational effort, was only used for a small number of selected scenarios and mainly served to examine the salinity structure within the fish migration river.

The mean water level in the Waddensea is higher than the mean water level in lake IJsselmeer. Therefore, without additional measures, regardless of its length a fish migration river level will result in a leakage of salt. Hence, a valve temporarily closing the migration river during flood is necessary. Main finding of our study is that, applying a valve, the fish migration river will not leak salt and will provide sufficient lure stream.

Comments

Presenting Author Bio:

Mr. Van der Kaaij graduated in 1988 at Delft University of Technology in coastal engineering. After fulfilling his military service, he joined the Dutch Ministry of Public Works where he was involved in numerical modelling of wind driven currents in shallow lakes. He joined WL | Delft Hydraulics in January 1990. Mr. Van der Kaaij is an expert on hydrodynamics, stratification, salinity intrusion and spreading of waste loads and cooling water. He is one of the early developers of the Delft3D modelling suite. His experience covers both the development of the modelling suite, the use of numerical models in practical applications as well as teaching how to apply these models in numerous countries.

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Jun 22nd, 11:40 AM Jun 22nd, 11:55 AM

Session E1: Hydrodynamics within a Fish Migration River Between Saline and Fresh Water

Groningen, The Netherlands

Abstract:

The presentation addresses the preliminary design of a fish migration river between the saline Dutch Waddensea and the fresh water lake IJsselmeer. An important constraint is that there should be no leakage of saline water from the Waddensea to lake IJsselmeer since this lake serves a fresh water reservoir for the northern part of the Netherlands. However, the fish migration river should provide a sufficient lure stream, increased levels of fresh water odeurs, in the Waddensea allowing fish to find the entrance of the fish migration river. In addition, the tidal range within the fish migration river should preferably allow for the development of brackish inter tidal areas

In our study we used a 1-dimensional hydrodynamic model (SOBEK) in combination with a 3-dimensional hydrodynamic model (Delft3D-Flow) of the fish migration river. These models compute water levels, flow velocities and salinities within a schematized fish migration river. The 1-dimensional model, due to its limited computational time, served as a “quick-scan”

model allowing many iterations (scenario simulations). The 3-dimensional model, requiring much more computational effort, was only used for a small number of selected scenarios and mainly served to examine the salinity structure within the fish migration river.

The mean water level in the Waddensea is higher than the mean water level in lake IJsselmeer. Therefore, without additional measures, regardless of its length a fish migration river level will result in a leakage of salt. Hence, a valve temporarily closing the migration river during flood is necessary. Main finding of our study is that, applying a valve, the fish migration river will not leak salt and will provide sufficient lure stream.

https://scholarworks.umass.edu/fishpassage_conference/2015/June22/2