Evaluation of Hydraulics and Downstream Fish Migration at Run-of-River Hydropower Plants with Horizontal Bar Rack Bypass Systems by Using CFD
Anthropogenic structures often block or delay the downstream migration of fish in rivers, thereby affecting their populations. A potential solution at run-of-river hydropower plants (HPPs) is the construction of a fish guidance structure in combination with a bypass system located at its downstream...
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| Language: | English |
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MDPI AG
2023-03-01
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| Series: | Water |
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| Online Access: | https://www.mdpi.com/2073-4441/15/6/1042 |
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| author | Hannes Zöschg Wolfgang Dobler Markus Aufleger Bernhard Zeiringer |
| author_facet | Hannes Zöschg Wolfgang Dobler Markus Aufleger Bernhard Zeiringer |
| author_sort | Hannes Zöschg |
| collection | DOAJ |
| description | Anthropogenic structures often block or delay the downstream migration of fish in rivers, thereby affecting their populations. A potential solution at run-of-river hydropower plants (HPPs) is the construction of a fish guidance structure in combination with a bypass system located at its downstream end. Crucial to fish guidance efficiency and thus to fish behavior are the hydraulic flow conditions in front of the fish guidance structure and upstream of the bypass entrance, which have not thus far been investigated in depth. The present study aims to extend the knowledge about the flow conditions at these structures. Based on the results of 3D numerical simulations of two idealized block-type HPPs with horizontal bar rack bypass systems, the flow conditions were examined, and the fish guidance efficiency was predicted. Herein, a new method was used to represent the fish guidance structure in the numerical model. The results show that the approach flow to fish guidance structures at block-type HPPs varies significantly along their length, and areas with unfavorable flow conditions for downstream fish migration frequently occur according to common guidelines. Subsequently, eight variations were performed to investigate the effect of key components on the flow field, e.g., the bypass discharge. Finally, the results were compared with literature data and discussed. |
| first_indexed | 2024-03-11T05:45:38Z |
| format | Article |
| id | doaj.art-42d45c49b60241d79e9c0195475218c9 |
| institution | Directory Open Access Journal |
| issn | 2073-4441 |
| language | English |
| last_indexed | 2024-03-11T05:45:38Z |
| publishDate | 2023-03-01 |
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| record_format | Article |
| series | Water |
| spelling | doaj.art-42d45c49b60241d79e9c0195475218c92023-11-17T14:25:36ZengMDPI AGWater2073-44412023-03-01156104210.3390/w15061042Evaluation of Hydraulics and Downstream Fish Migration at Run-of-River Hydropower Plants with Horizontal Bar Rack Bypass Systems by Using CFDHannes Zöschg0Wolfgang Dobler1Markus Aufleger2Bernhard Zeiringer3Unit of Hydraulic Engineering, Department of Infrastructure, University of Innsbruck, 6020 Innsbruck, AustriaUnit of Hydraulic Engineering, Department of Infrastructure, University of Innsbruck, 6020 Innsbruck, AustriaUnit of Hydraulic Engineering, Department of Infrastructure, University of Innsbruck, 6020 Innsbruck, AustriaInstitute of Hydrobiology and Aquatic Ecosystem Management, University of Natural Resources and Life Sciences, 1180 Vienna, AustriaAnthropogenic structures often block or delay the downstream migration of fish in rivers, thereby affecting their populations. A potential solution at run-of-river hydropower plants (HPPs) is the construction of a fish guidance structure in combination with a bypass system located at its downstream end. Crucial to fish guidance efficiency and thus to fish behavior are the hydraulic flow conditions in front of the fish guidance structure and upstream of the bypass entrance, which have not thus far been investigated in depth. The present study aims to extend the knowledge about the flow conditions at these structures. Based on the results of 3D numerical simulations of two idealized block-type HPPs with horizontal bar rack bypass systems, the flow conditions were examined, and the fish guidance efficiency was predicted. Herein, a new method was used to represent the fish guidance structure in the numerical model. The results show that the approach flow to fish guidance structures at block-type HPPs varies significantly along their length, and areas with unfavorable flow conditions for downstream fish migration frequently occur according to common guidelines. Subsequently, eight variations were performed to investigate the effect of key components on the flow field, e.g., the bypass discharge. Finally, the results were compared with literature data and discussed.https://www.mdpi.com/2073-4441/15/6/10423D numerical modellingcomputational fluid dynamicsdownstream fish migrationfish guidance structuresfish protectionflow field |
| spellingShingle | Hannes Zöschg Wolfgang Dobler Markus Aufleger Bernhard Zeiringer Evaluation of Hydraulics and Downstream Fish Migration at Run-of-River Hydropower Plants with Horizontal Bar Rack Bypass Systems by Using CFD Water 3D numerical modelling computational fluid dynamics downstream fish migration fish guidance structures fish protection flow field |
| title | Evaluation of Hydraulics and Downstream Fish Migration at Run-of-River Hydropower Plants with Horizontal Bar Rack Bypass Systems by Using CFD |
| title_full | Evaluation of Hydraulics and Downstream Fish Migration at Run-of-River Hydropower Plants with Horizontal Bar Rack Bypass Systems by Using CFD |
| title_fullStr | Evaluation of Hydraulics and Downstream Fish Migration at Run-of-River Hydropower Plants with Horizontal Bar Rack Bypass Systems by Using CFD |
| title_full_unstemmed | Evaluation of Hydraulics and Downstream Fish Migration at Run-of-River Hydropower Plants with Horizontal Bar Rack Bypass Systems by Using CFD |
| title_short | Evaluation of Hydraulics and Downstream Fish Migration at Run-of-River Hydropower Plants with Horizontal Bar Rack Bypass Systems by Using CFD |
| title_sort | evaluation of hydraulics and downstream fish migration at run of river hydropower plants with horizontal bar rack bypass systems by using cfd |
| topic | 3D numerical modelling computational fluid dynamics downstream fish migration fish guidance structures fish protection flow field |
| url | https://www.mdpi.com/2073-4441/15/6/1042 |
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