Flood season partition and flood limit water level determination for cascade reservoirs downstream jinshajiang river

Abstract

The internal contradiction between flood risk and power generation benefit can be alleviated by studying the flood season and flood limit level of reservoir.It is of great significance to adjust the floodwater storage in flood season. In this paper, based on the normal distribution theory improved fuzzy set analysis method, according to the inflow flood of cascade reservoirs downstream Jinshajiang River, the flood season is divided into stages. The flood limit water level of cascade reservoir is determined by the mapping relationship between subordinate degree and flood control storage capacity.A intertemporal sampling method is proposed to correct the staging results and flood limit water level. The research results show that the end of the pre-flood season of cascade reservoirs downstream Jinshajiang River is July 15, and the beginning of the post-flood season is September 16, and the reasonable flood limit water levels of the four reservoirs from upstream to downstream are 962m, 800m, 575m and 374m respectively. The rationality of the stage flood limit water level is tested by the flood process with different typical flood magnification. The results of the lower stages of the Jinshajiang River and the stage water level of each reservoir can improve the economic benefits such as reservoir power generation and improve the utilization ratio of flood resources in flood season to a certain extent.