Abstract:

Ahai Hydropower Station is one of hydropower stations in the middle Jinshajiang River.Ahai Reservoir is very deep and inclined to form temperature stratification，which will change the water temperature significantly and bring disadvantage to the water environment.The temperature distribution of Ahai Reservoir in dry year was predicted by a 3D numerical model，which was verified through stratified current experimental data.The result shows：（1）the head area is in weak stratification state in winter and spring because of the low temperature of upstream flow.The maximal vertical temperature difference is 459℃ in April.（2）the temperature process of released water is lagged behind the natural process.The temperature will be lower between Feb.and Mar.but it will be higher between Sep.and Jan.the next year.（3）The minimal water temperature is increased after the reservoir stores water.The differences are 230 and 209℃ in Nov.and Dec.respectively.