Ecological Connectivity - R&D Projects - Revision history

Deutschl at 10:15, 27 February 2020

2020-02-27T10:15:15Z

← Older revision		Revision as of 10:15, 27 February 2020
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	[[de: Ökologische Durchgängigkeit - FuE-Projekte]]		[[de: Ökologische Durchgängigkeit - FuE-Projekte]]
	__NOAUTOLINKS__		__NOAUTOLINKS__
			BAW and BfG cooperate in Research & Development (R&D) regarding ecological connectivity. To answer questions pertaining to hydraulic and construction issues of fishways BAW and BfG set up projects, cooperate with universities and network with national and international research institutions.
			The research projects employ [https://www.baw.de/EN/wasserbau/methoden/methoden.html%7C physical models and numerical simulation processes] to examine hydraulic structures and systems. The BAW also operates a large flume in Karlsruhe to solve particular questions by conducting [https://www.baw.de/EN/wasserbau/themen/umwelt/ethohydraulik/ethohydraulik.html ethohydraulic tests].
			Findings of R&D will be extended to and reassessed at designated fishway [[Ecological Connectivity - Pilot Sites\|pilot sites]]. Results of R&D are integrated into design recommendations and [[Ecological Connectivity - Standardisation\|standardisation processes]] of fishways for the German Federal Waterways and Shipping Administration.

	The BfG/BAW research concept sets the frame for the institutions’ joint research activities.		The BfG/BAW research concept sets the frame for the institutions’ joint research activities.

Deutschl at 12:52, 26 February 2020

2020-02-26T12:52:55Z

← Older revision		Revision as of 12:52, 26 February 2020
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	==Research project "Downstream fish passage over weirs"==		==Research project "Downstream fish passage over weirs"==
	Besides upstream fish migration, downstream fish passage also plays a significant role in achieving the objectives of the European Water Framework Directive. While discussions have been focusing on fish protection and downstream migration at hydropower plants for some time now, the issue of downstream passage at weirs has increasingly gained importance. The project aims at developing a numerical model which represents the hydraulic processes occurring in a weir spillway as realistically as possible. Based on this model, the movements of passive floats (used as substitutes for fish) are examined to assess the risks of damages to the fish and better evaluate the related potentially harmful processes occurring during the fish’s descent over weirs. The project is a co-operation between the BAW’s Hydraulic Structures section and the Institute for Hydromechanics (IfH) at Karlsruhe Institute of Technology (KIT).		Besides upstream fish migration, downstream fish passage also plays a significant role in achieving the objectives of the European Water Framework Directive. While discussions have been focusing on fish protection and downstream migration at hydropower plants for some time now, the issue of downstream passage at weirs has increasingly gained importance. The project aims at developing a numerical model which represents the [https://www.baw.de/content/files/forschung_entwicklung/documents/B3953.01.04.70009.pdf hydraulic processes occurring in a weir spillway] as realistically as possible. Based on this model, the movements of passive floats (used as substitutes for fish) are examined to assess the risks of damages to the fish and better evaluate the related potentially harmful processes occurring during the fish’s descent over weirs. The project is a co-operation between the BAW’s Hydraulic Structures section and the [https://www.ifh.kit.edu/english/index.php Institute for Hydromechanics (IfH)] at Karlsruhe Institute of Technology (KIT).

	==Research project "Attraction of upstream fishways" (completed)==		==Research project "Attraction of upstream fishways" (completed)==
	In a co-operation with the Dieter-Thoma Laboratory and the Obernach Research Institute at the Technical University (TU) of Munich, the BAW conducted a research on the attraction of upstream fishways in the tailwater of hydropower plants. In addition to the development of parameters for the turbine outflow from hydropower plants and the modelling of the outflow in physical and numerical models, the assessment and definition of a good attraction flow to ensure attraction were relevant research topics. The project results provided the basis for dimensioning the attraction flow (recommendation in preparation) and planning the pilot facilities. The project data were also used as material for a ~~dissertation~~ prepared at the TU Munich.		In a co-operation with the [https://www.bgu.tum.de/en/wb/staff/dieter-thoma-laboratory/ Dieter-Thoma Laboratory] and the [https://www.bgu.tum.de/en/wb/staff/research-station-obernach/ Obernach Research Institute] at the Technical University (TU) of Munich, the BAW conducted a research on the attraction of upstream fishways in the tailwater of hydropower plants. In addition to the development of parameters for the turbine outflow from hydropower plants and the modelling of the outflow in physical and numerical models, the assessment and definition of a good attraction flow to ensure attraction were relevant research topics. The project results provided the basis for dimensioning the attraction flow (recommendation in preparation) and planning the [[Ecological Connectivity - Pilot Sites\|pilot facilities]]. The project data were also used as material for a [https://mediatum.ub.tum.de/doc/1473802/document.pdf doctoral thesis] prepared at the TU Munich.

	==<span id="Passierbarkeit">Research project "Passability of vertical slot fishways" (completed)</span>==		==<span id="Passierbarkeit">Research project "Passability of vertical slot fishways" (completed)</span>==
	In a co-operation with the Institute for Water and River Basin Management at Karlsruhe Institute of Technology, researchers looked into the hydraulics of vertical slot passes for upstream fish migration. An important part of the research co-operation involved describing the temporal fluctuations of the flow fields in the fishway and whether they can be anticipated by the animals. This subproject was concluded with a doctoral thesis. Another subproject investigated how the time-averaged flow fields manifest themselves in different flow patterns in the fishway pools. The flow patterns have an effect on the pools’ energy balance and the degree of passability. Additional tests were made to analyse the energy dissipation in the pools, e.g. regarding flow velocities and roughness values, and to develop specific approaches for determining discharge. The data collected were also used for developing physical and numerical modelling.		In a co-operation with the Institute for Water and River Basin Management at Karlsruhe Institute of Technology, researchers looked into the hydraulics of vertical slot passes for upstream fish migration. An important part of the research co-operation involved describing the temporal fluctuations of the flow fields in the fishway and whether they can be anticipated by the animals. This subproject was concluded with a [https://henry.baw.de/handle/20.500.11970/105137 doctoral thesis]. Another subproject investigated how the time-averaged flow fields manifest themselves in different [https://hdl.handle.net/20.500.11970/102425 flow patterns] in the fishway pools. The flow patterns have an effect on the pools’ energy balance and the degree of passability. Additional tests were made to analyse the energy dissipation in the pools, e.g. regarding flow velocities and roughness values, and to develop specific approaches for determining discharge. The data collected were also used for developing physical and numerical modelling.

	==<span id="ELAM-DE">Research project "ELAM-de" (completed)</span>==		==<span id="ELAM-DE">Research project "ELAM-de" (completed)</span>==
	An important criterion for the assessment of a fishway is its efficiency, which is, however, difficult and time-consuming to determine in the field or laboratory. A numerical model for simulating fish behaviour on spatial and temporal scales of decimetres and seconds, respectively, can support planning decisions and contribute to scientific understanding of the performance of competing fishway designs. Based on the "Eulerian-Lagrangian-agent method" (ELAM), a new individual-based model ("ELAM-de") was developed. The model was fed with three-dimensional flow data calculated with OpenFOAM® on arbitrary polyhedral meshes. It was designed, calibrated and validated based on behavioural patterns derived from the movements of live brown trout. The project was concluded with a doctoral thesis (in co-operation with the Bundeswehr University Munich).		An important criterion for the assessment of a fishway is its efficiency, which is, however, difficult and time-consuming to determine in the field or laboratory. A numerical model for simulating fish behaviour on spatial and temporal scales of decimetres and seconds, respectively, can support planning decisions and contribute to scientific understanding of the performance of competing fishway designs. Based on the "Eulerian-Lagrangian-agent method" (ELAM), a new individual-based model ("ELAM-de") was developed. The model was fed with three-dimensional flow data calculated with OpenFOAM® on arbitrary polyhedral meshes. It was designed, calibrated and validated based on behavioural patterns [https://www.baw.de/EN/wasserbau/themen/umwelt/ethohydraulik/ethohydraulik.html derived from the movements of live brown trout]. The project was concluded with a [https://henry.baw.de/handle/20.500.11970/105158 doctoral thesis] (in co-operation with the [https://www.unibw.de/wasserwesen-en/hydro-en/hydro Bundeswehr University Munich]).

			[https://henry.baw.de/handle/20.500.11970/106572 Link to final report]

	----		----

Deutschl at 14:23, 25 February 2020

2020-02-25T14:23:21Z

← Older revision		Revision as of 14:23, 25 February 2020
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	[[de: Ökologische Durchgängigkeit - ~~F+E~~-Projekte]]		[[de: Ökologische Durchgängigkeit - FuE-Projekte]]
	~~To solve connectivity questions regarding dimensions of stuctures and hydraulical topics~~ BAW ~~Section W1 and BfG Section U4~~		__NOAUTOLINKS__
	~~pursue their own~~ research ~~and development projects (R&D). These include several projects at BAW and/or BfG, cooperations with universities and a close network with national and international~~ research ~~institutions~~.		The BfG/BAW research concept sets the frame for the institutions’ joint research activities.

	~~Physical and hydronumerical modelling~~ are ~~employed~~. ~~Ethohydraulical trials are executed~~ in ~~a relatively large research~~ [~~[channel]]~~. ~~The scientific findings of R&D projects will be more thoroughly investigated~~ at ~~projected pilot sites. R&D serve to assess~~ the ~~necessary dimensions~~ of ~~fish passes and to councel~~ the ~~German Waterways~~ and ~~Shipping Administration~~ in ~~their aim to achieve river connectivity~~. ~~Results will be published~~ in:		==Research project "Special fishway structures"==
			On large inland waterways it is often necessary to discharge auxiliary water in addition to the operating flow in order to produce an attraction flow which ensures that the fishway can be located. The quantity of auxiliary water needed is often substantial, requiring special structures for which no specific design recommendations are available. The BAW is dealing with this topic in two subprojects, one of which is conducted in co-operation with the [https://www.tu-braunschweig.de/en/lwi/wasserbau Leichtweiß Institute for Hydraulic Engineering and Water Resources at Technische Universität Braunschweig], addressing the issue of providing the auxiliary water as well as calming and homogenisation of flow in the auxiliary water inflow. In a second subproject, design solutions for the entrance pool into which the auxiliary water is injected are developed. Here, research is focusing on the unhindered passage of fish into the fishway, with a particular emphasis on conducting preliminary studies for specific construction elements with scale models before testing these elements in [https://www.baw.de/EN/wasserbau/themen/umwelt/ethohydraulik/ethohydraulik.html ethohydraulic trials].

	* [http://www.baw.de/EN/service_wissen/publikationen/forschung_xpress/forschung_xpress.html?highlight=~~xpress%7C\| BAW Forschung Xpress]~~		==Research project "Time-dependent flow processes"==
	* [http://www.~~baw~~.~~de/EN/wasserbau/forschung_entwicklung/forschung_entwicklung.html%7C~~\| ~~Research and Development~~]		The hydraulics in fish passes is usually evaluated based on time-averaged flow velocities. In turbulent flows in and at fish passes, however, the temporal flow velocity changes and their structure play an important role in how fish sense the flow. In a [[Ecological Connectivity - R&D Projects#Passierbarkeit\|previous project]], a methodology for describing dynamic processes in flow fields has been developed based on PIV measurements in a vertical-slot fish pass. The aim of the present project is to adapt this methodology to further relevant scales. In order to gain a better understanding of the effects of hydraulics on fish behaviour and to verify the previously developed methodology, fish behaviour experiments are performed in the ethohydraulic flume of the BAW.
	* [http://www.~~baw~~.~~de/EN/wasserbau/methoden/methoden~~.~~html\| Methods]~~

	===~~Terminated~~ R&D ~~project===~~		==Research project "ELAM attraction"==
			Based on [[Ecological Connectivity - R&D Projects#ELAM-DE\|previous research]] a model is being [https://www.baw.de/content/files/forschung_entwicklung/documents/B3953.01.04.70010.pdf developed] to evaluate the attraction of fishways in the tailwater of hydropower plants. The method primarily applied is individual-based modelling using the "Eulerian-Lagrangian-agent method" (ELAM). For the model's development, data from extensive fish observations carried out by BfG by means of acoustic telemetric field investigations in the tailwater of the [[Ecological Connectivity - Pilot Sites\|pilot facility in Eddersheim]] are used. To simulate the flow field in the tailwater of hydropower plants, the BAW uses [https://www.baw.de/EN/wasserbau/methoden/numerische_simulationen/numerische_simulationen.html three-dimensional numerical models] which are developed in OpenFOAM®. The ELAM combines their results with a behavioural model.

	~~[[File: Physikal-Modell-Lauffen~~.~~png\|thumb\|Physical~~ model. ~~Power plant tailwater Lauffen~~ (~~River Neckar~~)]]		==Research project "Downstream fish passage over weirs"==
	~~[[File: Geschwvert_Lauffen~~.~~png\|thumb\|Velocity distribution in~~ the ~~physical model. Power plant tailwater Lauffen~~ (~~River Neckar~~)]]		Besides upstream fish migration, downstream fish passage also plays a significant role in achieving the objectives of the European Water Framework Directive. While discussions have been focusing on fish protection and downstream migration at hydropower plants for some time now, the issue of downstream passage at weirs has increasingly gained importance. The project aims at developing a numerical model which represents the hydraulic processes occurring in a weir spillway as realistically as possible. Based on this model, the movements of passive floats (used as substitutes for fish) are examined to assess the risks of damages to the fish and better evaluate the related potentially harmful processes occurring during the fish’s descent over weirs. The project is a co-operation between the BAW’s Hydraulic Structures section and the Institute for Hydromechanics (IfH) at Karlsruhe Institute of Technology (KIT).

	~~A [[model]]~~ of the tailwater of ~~a power plant~~ to the ~~scale 1:10 was built~~, ~~to help determine~~ the ~~[[attraction]]~~ of a ~~fishway located close~~ to the ~~hydro-electric plant~~. ~~A location that is easily found by~~ the ~~fish is~~ the ~~first step towards~~ the ~~functioning~~ of an upstream [[fish ~~pass]] facility, but is probably also~~ the ~~most complex. The~~ flow ~~from~~ the ~~fish pass competes~~ with ~~that of~~ the ~~hydro~~-~~electric plant~~. The ~~objective~~ of the ~~investigations was~~ to ~~create a migration corridor suitable~~ for ~~a wide range of fish species~~. ~~This migration corridor should on average be existent 300 days per year under fluctuating discharges~~ and ~~tailwater levels~~. ~~For attraction~~ of ~~fish~~ in the ~~corridor flow velocities are a crucial factor~~. ~~The~~ fish ~~must be able~~ to ~~perceive~~ the ~~[[attraction~~ flow]], ~~but it must not fatigue them.~~		==Research project "Attraction of upstream fishways" (completed)==
	~~Various discharges~~ and ~~different geometries~~ of the ~~entrance structure were studied to find an optimized configuration regarding the migration corridor~~.		In a co-operation with the Dieter-Thoma Laboratory and the Obernach Research Institute at the Technical University (TU) of Munich, the BAW conducted a research on the attraction of upstream fishways in the tailwater of hydropower plants. In addition to the development of parameters for the turbine outflow from hydropower plants and the modelling of the outflow in physical and numerical models, the assessment and definition of a good attraction flow to ensure attraction were relevant research topics. The project results provided the basis for dimensioning the attraction flow (recommendation in preparation) and planning the pilot facilities. The project data were also used as material for a dissertation prepared at the TU Munich.

			==<span id="Passierbarkeit">Research project "Passability of vertical slot fishways" (completed)</span>==
			In a co-operation with the Institute for Water and River Basin Management at Karlsruhe Institute of Technology, researchers looked into the hydraulics of vertical slot passes for upstream fish migration. An important part of the research co-operation involved describing the temporal fluctuations of the flow fields in the fishway and whether they can be anticipated by the animals. This subproject was concluded with a doctoral thesis. Another subproject investigated how the time-averaged flow fields manifest themselves in different flow patterns in the fishway pools. The flow patterns have an effect on the pools’ energy balance and the degree of passability. Additional tests were made to analyse the energy dissipation in the pools, e.g. regarding flow velocities and roughness values, and to develop specific approaches for determining discharge. The data collected were also used for developing physical and numerical modelling.

			==<span id="ELAM-DE">Research project "ELAM-de" (completed)</span>==
			An important criterion for the assessment of a fishway is its efficiency, which is, however, difficult and time-consuming to determine in the field or laboratory. A numerical model for simulating fish behaviour on spatial and temporal scales of decimetres and seconds, respectively, can support planning decisions and contribute to scientific understanding of the performance of competing fishway designs. Based on the "Eulerian-Lagrangian-agent method" (ELAM), a new individual-based model ("ELAM-de") was developed. The model was fed with three-dimensional flow data calculated with OpenFOAM® on arbitrary polyhedral meshes. It was designed, calibrated and validated based on behavioural patterns derived from the movements of live brown trout. The project was concluded with a doctoral thesis (in co-operation with the Bundeswehr University Munich).

	For interested members of the general public, a 3-D real time simulation was commissioned by the BAW to enable visualisation of the topic of upstream fish migration. This virtual fish pass has already been used successfully at public events.
	----		----
	Back to: [[Ecological Connectivity]]		Back to: [[Ecological Connectivity]]
	----		----
	[[Overview]]		[[Overview]]

imported>Kampker Anne at 10:21, 13 December 2017

2017-12-13T10:21:37Z

← Older revision		Revision as of 10:21, 13 December 2017
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	[[de: Ökologische Durchgängigkeit - F+E-Projekte]]		[[de: Ökologische Durchgängigkeit - F+E-Projekte]]
	~~In the BAW’s experimental halls~~, ~~two physical models have been set up, which~~ are to ~~help in solving open questions on~~ the ~~planning and construction~~ of ~~an upstream~~ fish ~~pass facility regarding both, a particular location~~ and ~~general principles~~.		To solve connectivity questions regarding dimensions of stuctures and hydraulical topics BAW Section W1 and BfG Section U4
			pursue their own research and development projects (R&D). These include several projects at BAW and/or BfG, cooperations with universities and a close network with national and international research institutions.

			Physical and hydronumerical modelling are employed. Ethohydraulical trials are executed in a relatively large research [[channel]]. The scientific findings of R&D projects will be more thoroughly investigated at projected pilot sites. R&D serve to assess the necessary dimensions of fish passes and to councel the German Waterways and Shipping Administration in their aim to achieve river connectivity. Results will be published in:

			* [http://www.baw.de/EN/service_wissen/publikationen/forschung_xpress/forschung_xpress.html?highlight=xpress%7C\| BAW Forschung Xpress]
			* [http://www.baw.de/EN/wasserbau/forschung_entwicklung/forschung_entwicklung.html%7C\| Research and Development]
			* [http://www.baw.de/EN/wasserbau/methoden/methoden.html\| Methods]

			===Terminated R&D project===

	[[File: Physikal-Modell-Lauffen.png\|thumb\|Physical model. Power plant tailwater Lauffen (River Neckar)]]		[[File: Physikal-Modell-Lauffen.png\|thumb\|Physical model. Power plant tailwater Lauffen (River Neckar)]]
	The first is a model of the tailwater of a power plant to the scale 1:10, to help determine how easy or difficult it is for fish to locate the upstream fish pass facility. A location that is easily found by the fish is the first step towards the functioning of an upstream fish pass facility, but is probably also the most complex. The flow from the fish pass competes with that of the hydro-electric plant. The objective is to produce a migration corridor that is suitable for a wide range of fish species. This migration corridor should be existent on 300 days of the year under fluctuating tailwater levels. For the “attractiveness” of the corridor flow velocities are a critical factor. The flow must be perceptible for the fish, but must not be too strong for them. The model can be used to study various discharges and different geometries of the entrance structure to find an optimized configuration regarding the migration corridor.
	[[File: Geschwvert_Lauffen.png\|thumb\|Velocity distribution in the physical model. Power plant tailwater Lauffen (River Neckar)]]		[[File: Geschwvert_Lauffen.png\|thumb\|Velocity distribution in the physical model. Power plant tailwater Lauffen (River Neckar)]]
	~~The second is a~~ model of a ~~vertical slot pass~~, ~~which is intended~~ to help ~~with research into questions~~ of ~~passability~~ of upstream fish pass ~~facilities. Here studies of the hydraulic aspects of passability~~, ~~such as~~ the ~~relationship between slot geometry, maximum~~ flow ~~velocity and turbulence are~~ the ~~main points under consideration.~~
	~~The model includes nine successive basins so~~ that ~~the effects~~ of the ~~hydraulic conditions of subsequent basins can be determined~~.		A [[model]] of the tailwater of a power plant to the scale 1:10 was built, to help determine the [[attraction]] of a fishway located close to the hydro-electric plant. A location that is easily found by the fish is the first step towards the functioning of an upstream [[fish pass]] facility, but is probably also the most complex. The flow from the fish pass competes with that of the hydro-electric plant. The objective of the investigations was to create a migration corridor suitable for a wide range of fish species. This migration corridor should on average be existent 300 days per year under fluctuating discharges and tailwater levels. For attraction of fish in the corridor flow velocities are a crucial factor. The fish must be able to perceive the [[attraction flow]], but it must not fatigue them.
	The ~~size~~ of the ~~basins~~ of ~~the model permit studies for various~~ fish ~~pass facilities~~ on a ~~scale between 1:3~~ and ~~1:4~~.		Various discharges and different geometries of the entrance structure were studied to find an optimized configuration regarding the migration corridor.

	For interested members of the general public, a 3-D real time simulation was commissioned by the BAW to enable visualisation of the topic of upstream fish migration. This virtual fish pass has already been used successfully at public events.		For interested members of the general public, a 3-D real time simulation was commissioned by the BAW to enable visualisation of the topic of upstream fish migration. This virtual fish pass has already been used successfully at public events.

imported>Mueller-hagedorn at 10:44, 19 December 2011

2011-12-19T10:44:52Z

← Older revision		Revision as of 10:44, 19 December 2011
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	[[File: Physikal-Modell-Lauffen.png\|thumb\|Physical model. Power plant tailwater Lauffen (River Neckar)]]		[[File: Physikal-Modell-Lauffen.png\|thumb\|Physical model. Power plant tailwater Lauffen (River Neckar)]]
	The first is a model of the tailwater of a power plant to the scale 1:10, to help determine how easy or difficult it is for fish to locate the upstream fish pass facility. A location that is easily found by the fish is the first step towards the functioning of an upstream fish pass facility, but is probably also the most complex. The flow from the fish pass competes with that of the hydro-electric plant. The objective is to produce a migration corridor that is suitable for a wide range of fish species. This migration corridor should be existent on 300 days of the year under fluctuating tailwater levels. For the “attractiveness” of the corridor flow velocities are a critical factor. The flow must be perceptible for the fish, but must not be too strong for them. The model can be used to study various discharges and different geometries of the entrance structure to find an optimized configuration regarding the migration corridor.		The first is a model of the tailwater of a power plant to the scale 1:10, to help determine how easy or difficult it is for fish to locate the upstream fish pass facility. A location that is easily found by the fish is the first step towards the functioning of an upstream fish pass facility, but is probably also the most complex. The flow from the fish pass competes with that of the hydro-electric plant. The objective is to produce a migration corridor that is suitable for a wide range of fish species. This migration corridor should be existent on 300 days of the year under fluctuating tailwater levels. For the “attractiveness” of the corridor flow velocities are a critical factor. The flow must be perceptible for the fish, but must not be too strong for them. The model can be used to study various discharges and different geometries of the entrance structure to find an optimized configuration regarding the migration corridor.
			[[File: Geschwvert_Lauffen.png\|thumb\|Velocity distribution in the physical model. Power plant tailwater Lauffen (River Neckar)]]
	The second is a model of a vertical slot pass, which is intended to help with research into questions of passability of upstream fish pass facilities. Here studies of the hydraulic aspects of passability, such as the relationship between slot geometry, maximum flow velocity and turbulence are the main points under consideration.		The second is a model of a vertical slot pass, which is intended to help with research into questions of passability of upstream fish pass facilities. Here studies of the hydraulic aspects of passability, such as the relationship between slot geometry, maximum flow velocity and turbulence are the main points under consideration.
	The model includes nine successive basins so that the effects of the hydraulic conditions of subsequent basins can be determined.		The model includes nine successive basins so that the effects of the hydraulic conditions of subsequent basins can be determined.

imported>Mueller-hagedorn at 10:43, 19 December 2011

2011-12-19T10:43:15Z

← Older revision		Revision as of 10:43, 19 December 2011
Line 1:		Line 1:
	[[de: Ökologische Durchgängigkeit - F+E-Projekte]]		[[de: Ökologische Durchgängigkeit - F+E-Projekte]]
	In the BAW’s experimental halls, two physical models have been set up, which are to help in solving open questions on the planning and construction of an upstream fish pass facility regarding both, a particular location and general principles.		In the BAW’s experimental halls, two physical models have been set up, which are to help in solving open questions on the planning and construction of an upstream fish pass facility regarding both, a particular location and general principles.
			[[File: Physikal-Modell-Lauffen.png\|thumb\|Physical model. Power plant tailwater Lauffen (River Neckar)]]
	The first is a model of the tailwater of a power plant to the scale 1:10, to help determine how easy or difficult it is for fish to locate the upstream fish pass facility. A location that is easily found by the fish is the first step towards the functioning of an upstream fish pass facility, but is probably also the most complex. The flow from the fish pass competes with that of the hydro-electric plant. The objective is to produce a migration corridor that is suitable for a wide range of fish species. This migration corridor should be existent on 300 days of the year under fluctuating tailwater levels. For the “attractiveness” of the corridor flow velocities are a critical factor. The flow must be perceptible for the fish, but must not be too strong for them. The model can be used to study various discharges and different geometries of the entrance structure to find an optimized configuration regarding the migration corridor.		The first is a model of the tailwater of a power plant to the scale 1:10, to help determine how easy or difficult it is for fish to locate the upstream fish pass facility. A location that is easily found by the fish is the first step towards the functioning of an upstream fish pass facility, but is probably also the most complex. The flow from the fish pass competes with that of the hydro-electric plant. The objective is to produce a migration corridor that is suitable for a wide range of fish species. This migration corridor should be existent on 300 days of the year under fluctuating tailwater levels. For the “attractiveness” of the corridor flow velocities are a critical factor. The flow must be perceptible for the fish, but must not be too strong for them. The model can be used to study various discharges and different geometries of the entrance structure to find an optimized configuration regarding the migration corridor.

imported>Mueller-hagedorn: Created page with 'de: Ökologische Durchgängigkeit - F+E-Projekte In the BAW’s experimental halls, two physical models have been set up, which are to help in solving open questions on the p…'

2011-12-19T10:37:01Z

Created page with 'de: Ökologische Durchgängigkeit - F+E-Projekte In the BAW’s experimental halls, two physical models have been set up, which are to help in solving open questions on the p…'

New page

[[de: Ökologische Durchgängigkeit - F+E-Projekte]]
In the BAW’s experimental halls, two physical models have been set up, which are to help in solving open questions on the planning and construction of an upstream fish pass facility regarding both, a particular location and general principles.

The first is a model of the tailwater of a power plant to the scale 1:10, to help determine how easy or difficult it is for fish to locate the upstream fish pass facility. A location that is easily found by the fish is the first step towards the functioning of an upstream fish pass facility, but is probably also the most complex. The flow from the fish pass competes with that of the hydro-electric plant. The objective is to produce a migration corridor that is suitable for a wide range of fish species. This migration corridor should be existent on 300 days of the year under fluctuating tailwater levels. For the “attractiveness” of the corridor flow velocities are a critical factor. The flow must be perceptible for the fish, but must not be too strong for them. The model can be used to study various discharges and different geometries of the entrance structure to find an optimized configuration regarding the migration corridor.

The second is a model of a vertical slot pass, which is intended to help with research into questions of passability of upstream fish pass facilities. Here studies of the hydraulic aspects of passability, such as the relationship between slot geometry, maximum flow velocity and turbulence are the main points under consideration.
The model includes nine successive basins so that the effects of the hydraulic conditions of subsequent basins can be determined.
The size of the basins of the model permit studies for various fish pass facilities on a scale between 1:3 and 1:4.

For interested members of the general public, a 3-D real time simulation was commissioned by the BAW to enable visualisation of the topic of upstream fish migration. This virtual fish pass has already been used successfully at public events.
----
Back to: [[Ecological Connectivity]]
----
[[Overview]]