Deciphering the effect of variation in slope on flow characteristics in a vertical slot fishway

湍流动能 湍流 涡度 地质学 流量(数学) 机械 消散 动能 涡流 气象学 数学 几何学 物理 经典力学 热力学
作者
Hao Yuan,Boyu Chen,Qian Sun,Chunhang Xie,Xiaolong He
出处
期刊:Journal of Hydro-environment Research [Elsevier BV]
卷期号:54: 1-12 被引量:1
标识
DOI:10.1016/j.jher.2024.02.005
摘要

The effects of a vertical slot fishway slope (with slope values from 1.5% to 6%) on a flow field are numerically investigated, using a re-normalization group k – ε model. The distribution of the velocity, turbulence kinetic energy (TKE), average energy dissipation rate per unit volume (E), and vorticity for different slopes are systemically explored. The results indicate that, with an increase in slope, the appearance of downward flow in conjunction with an increase in vertical velocity results in three-dimensional flow characteristics. The recirculation region in Hs, at a 6.0% slope, was 20.9% less than that at a 1.5% slope. Meanwhile, the flow velocity in the vertical slot region grew with increasing slope, which would limit the passage of fish with burst speed lower than the velocity in the vertical slot region. The TKE and E may locally exceed the threshold at larger slopes. Furthermore, vorticity distribution shows little variability with increasing slope, but may interfere with the equilibrium of the fish in the vertical slot region. In addition, the change in water level has little effect on the flow field, which is changed by the increase in slope. These findings can aid vertical slot fishway designs especially in terms of the efficiency of fish passage.
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