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Hydraulic Resistance of Emergent Macroroughness at Large Froude Numbers: Design of Nature-Like Fishpasses

Cassan, Ludovic and Tran, Dung Tien and Courret, Dominique and Laurens, Pascale and Dartus, Denis Hydraulic Resistance of Emergent Macroroughness at Large Froude Numbers: Design of Nature-Like Fishpasses. (2014) Journal of Hydraulic Engineering, 140 (9). 1-9. ISSN 0733-9429

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Official URL: http://dx.doi.org/10.1061/(ASCE)HY.1943-7900.0000910

Abstract

The mean flow in a nature-like fishpass can be highly modified by the Froude number. It is important to understand this evolution to correctly design the structure. The studied configuration is an emergent staggered arrangement of obstacles. The hydraulic resistance of a fishpass is experimentally investigated that depends on several geometric parameters: block shape, ramp slope, block density, and bed roughness. An analytical model based on the balance momentum allows one to quantify the influence of each hydraulic parameter. The bed roughness has a weak influence, whereas the block shape and the Froude number are significant. The variation of the drag coefficient was analyzed to improve the stage-discharge relationship. To this end, a correlation with the block diameter and water level is proposed. The maximal velocity reached in the fishpass can also be estimated. These results have to be compared with the fish swimming ability to assess the fishpass passability.

Item Type:Article
Additional Information:Thanks to American Society of Civil Engineers editor. The definitive version is available at http://cedb.asce.org The original PDF of the article can be found at American Society of Civil Engineers website : http://ascelibrary.org/doi/10.1061/%28ASCE%29HY.1943-7900.0000910 This papers appears in Volume 140: Journal of Hydraulic Engineering. ISSN: 0733-9429. This article is under ASCM copyright.
HAL Id:hal-01166268
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > Office national de l'eau et des milieux aquatiques - ONEMA (FRANCE)
Other partners > Thuy Loi University - TLU (VIETNAM)
Laboratory name:
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Deposited By: Ludovic CASSAN
Deposited On:22 Jun 2015 12:29

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