Study of Dam-Break Flow Over a Vegetated Channel With and Without a Drop

WATER RESOURCES MANAGEMENT(2023)

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摘要
The effects of a drop in a vegetated channel on the flow characteristics during a dam failure were investigated using a numerical approach. A CFD package was used for all dam failure simulations. After performing validation tests, the model was used to predict the flow characteristics during a dam failure over a vegetated channel with positive, negative, or no drop. A positive drop resulted in a backflow into the reservoir with a negative discharge of Q backflow = − 0.01 m 3 /s. Even in the channel with no drop, backflow into the reservoir occurred in the last stage due to the drag effect of the vegetation. The maximum discharge occurred at the peak time t peak = 2.5 s above the drop for all models. The peak discharge decreased from Q peak = 0.037 m 3 /s to Q peak = 0.032 m 3 /s with increasing positive drop height. However, a negative drop had no significant effect on peak discharge values. In most cases, the maximum flow velocity was around u m = 2 m/s. The maximum eddy values decreased by Δ ω max = 500 1/s for the positive drops and increased by Δ ω max = 700 1/s for negative drops at the middle stage.
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关键词
Dam-break modelling,Topography,Bed elevation,Vegetation effect,CFD
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