Abstract
Continual runoff events in flooding season affect hydraulic structure and nutrient circulation strongly in reservoirs. The phenomenon of turbid current intrusion and water clarity decreasing was observed in flooding season in Liuxihe reservoir, Guangdong, south China. Numerical simulation techniques are used to study the hydrodynamic processes of runoff events. According to 2 years’ monthly measurements, daily inflow turbidity is estimated by inflow volume and precipitation. Then, a 1-D hydrodynamic coupled with water quality model is applied to simulate the thermal stratification and vertical turbidity distribution during the period with high turbid runoff events. The results show good performance in reproducing the reservoir thermal structure, the magnitude and distribution of turbidity in the reservoir. Based on these, 4 simulation cases are introduced to examine the effects of different reservoir management measures (e.g. different outflow volume and withdrawal depth) on suspended matters’ concentration (turbidity) and distribution in water column. The results can be the basis of water quality management measures of the reservoir administration and local government.
Published Version
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