Abstract
High flow generates significant alterations in downstream river reaches, resulting in physical condition changes in the downstream regions of the river such as water depth, flow velocity, water temperature and river bed. These alterations will lead to change in fish habitat configuration in the river. This paper proposes a model system to evaluate the high flow effects on river velocity, water depth, substrates changes, temperature distribution and consequently assess the change in spawning and juvenile rainbow trout (Oncorhynchus mykiss) habitats in the downstream region of the Glen Canyon Dam. Firstly, based on the 2 dimensional (2D) depth-averaged CFD (Computational Fluid Dynamics) model and heat transfer equation applied for simulation, three indices were simulated, namely depth, flow velocity and temperature distribution. Then, the spawning and juvenile fish preference curves were obtained based on these three indices and substrates distribution. After that, the habitat model was proposed and used to simulate the high flow effects on juvenile and spawning rainbow trout habitat structure. Finally, the weighted usable area (WUA) and overall suitability index (OSI) of the spawning and juvenile fish species were quantitatively simulated to estimate the habitat sensitivity. The results illustrate that the high flow effect (HFE) increased the juvenile rainbow trout habitat quality but decreased the spawning rainbow trout habitat quality. The juvenile trout were mainly affected by the water depth while the spawning rainbow trout were dominated by the bed elevation.
Highlights
River environments are closely related to hydraulic flow velocity, water depth and river water temperature
The site of spawning and juvenile rainbow trout living in Colorado River—stretching from downstream of the Glen Canyon Dam to Lees Ferry—was analyzed to verify the high flow effects on flow velocity, water depth, temperature and substrates on the tail water of the dam and the habitat suitability quality
We can interpret that Effects prior toon the startBed of the high flow effect (HFE), the temperature distribution is mostly uniform in the
Summary
River environments are closely related to hydraulic flow velocity, water depth and river water temperature. The high flow situation in rivers, which is an important determinant of habitat distribution [4]. The inclusioninof high flow scour and temperature effects from could offer a more further improvement the evaluation of the impact of dam operation on reservoir, the surrounding fish habitats. Physical habitat models parameters have been this gives a detailed description of the flow velocity calculation, type study, modeling used as a tool for management since the. It is important to couple bothin sediment and heat flow scour and flowhydraulic temperature in characterizing the habitat quality rivers [14].transport. While considering transfer equations a habitat to model soboth as tosediment obtain a transport more precise to predict hydraulic indices, itwith is important couple and and heatreliable transfermodel equations with a river and fish habitat.
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