Passage Performance of Potamodromous Cyprinids over an Experimental Low-Head Ramped Weir: The Effect of Ramp Length and Slope

Sustainability

AntónioNascimento Pinheiro¹  SusanaDias Amaral²  JoséMaria Santos²  Paulo Branco²  MariaTeresa Ferreira²  Christos Katopodis³ 

[1] CERIS—Civil Engineering for Research and Innovation for Sustainability, Técnico, University of Lisbon, Avenida Rovisco Pais, 1049-001 Lisboa, Portugal;Forest Research Centre, School of Agriculture, University of Lisbon, Tapada da Ajuda, 1349-017 Lisboa, Portugal;Katopodis Ecohydraulics Ltd., 122 Valence Avenue, Winnipeg, MB R3T 3W7, Canada;

关键词: potamodromous cyprinid species;    low-head ramped weirs;    upstream migration;    ecohydraulics;   

DOI  :  10.3390/su11051456

来源: DOAJ

【 摘 要 】

Low-head ramped weirs are a common instream obstacle to fish movements. Fish passability of these structures, where water passes over but does not generate a waterfall, is primarily related to ramp length and slope, but their relative contribution has seldom been considered. This study aims to assess the passage performance of a potamodromous cyprinid, the Iberian barbel (Luciobarbus bocagei), negotiating an experimental ramped weir with varying ramp length (L) and slope (S). Four configurations were tested, with a constant discharge of 110 L∙s−1. Results suggest that both factors influenced passage performance of fish. Attraction efficiency (AE) increased with increasing L and S, whereas the number of successes (N) and passage efficiency (PE) decreased upon increasing L. For S, it was found that both N and PE peaked at the intermediate level (20%). These results suggest that configurations with the lowest slopes may not necessarily be the best option because they may be less attractive for the fish and their demand for space is higher. Higher slopes (but not excessive) could be more attractive to fish, less space-demanding, and therefore, more cost-effective. Future studies should investigate how discharge and boulder placement influence fish passage across ramped weirs, to improve habitat connectivity.

【 授权许可】

Unknown