Higher-order Velocity Moments, Turbulence Scales and Energy Dissipation Rate around a Boulder in a Rock-ramp Fish Passage

Sustainability

Amir Golpira¹  AbulBM Baki¹  DavidZ. Zhu² 

[1] Civil and Environmental Engineering Department, Clarkson University, Potsdam, NY 13699, USA;Department of Civil and Environmental Engineering, University of Alberta, Edmonton, AB, T6G 2W2, CANADA;

关键词: boulders;    energy dissipation rate;    higher-order moments;    integral length and time scale;    rock-ramp fish passage.;   

DOI  :  10.3390/su12135385

来源: DOAJ

【 摘 要 】

This experimental study investigated the higher-order velocity moments, turbulence time and length scales, and energy dissipation rates around an intermediately submerged boulder within a wake-interference flow regime in a rock-ramp fish passage. The results show a noticeable variation in the studied parameters in the wake of the boulder, as well as near the bed and boulder crest. The higher-order velocity moments show the presence of infrequent strong ejections downstream of the boulder, which may lead to higher sediment deposition and vertical mixing. The eddy length scales and the volumetric energy dissipation in this experimental model were discussed in relation to fish behavior for both the experimental model and a prototype. Relationships were proposed to roughly estimate integral length scales and energy dissipation rates around the boulder over the flow depth. The findings of this study may improve the design of rock-ramp fish passages considering the effects of turbulence on fish swimming performance and sediment transport.

【 授权许可】

Unknown