枕头坝——沙坪二级河段流量延时时间分析

Analysis on the Flow Delay Time of the Second Class Reach from Zhentouba to Shaping

研究区域选定为枕头坝一级电站下游至沙坪二级电站上游河段全长28 km的大渡河干流河段,由于研究区域现有的水文资料有限,沙坪二级电站缺乏入库流量监测设备,给水动力参数的演变规律研究带来了很大的困难。本研究根据实测的水位、流量、河道地形资料,使用HEC-RAS建立枕头坝一级水电站—沙坪二级水电站一维水动力模型,精细描述水流在区间河道的演进过程,探究在模型运行中河道糙率与流量的关系以及延时时间与流量的关系,为水电站短期水位预测模型和实时调控策略提供重要依据。

This paper selects the 28 km main stream of the Daduhe River from the downstream of the Zhentouba I Hydropower Station to the upstream of the Shaping II Hydropower Station as the study area. Due to the limited existing hydrological data of this area as well as the lack of incoming flow monitoring equipment in the Shaping II Hydropower Station,big difficulties have been brought to the study of the evolution of hydrodynamic parameters. This study uses HEC-RAS to establish a one-dimensional hydrodynamic model of the Zhentouba I Hydropower Station-Shaping II Hydropower Station based on the measured water level,flow and river topography data,and to finely describe the evolution process of the water flow in the interval of the river. The relationship between river roughness and flow and the relationship between delay time and flow in the operation of the model provide is analyzed which can provide an important basis for the short-term water level prediction model and real-time control strategy of hydropower stations.