Application of HBV Hydrological Model in Critical Surface Rainfall of Flood Disaster in Qiushui River Basin of Yangxian County

REN Yuan-xin;ZHOU Qi;SU Xie-wei;LEI Yang-na;College of geography and Environment,Baoji University of Arts and Sciences;Shaanxi Key Laboratory of Disaster Monitoring and Mechanism Simulation;Shaanxi Province Climate Center;

REN Yuan-xin%ZHOU Qi%SU Xie-wei%LEI Yang-na%College of geography and Environment,Baoji University of Arts and Sciences%Shaanxi Key Laboratory of Disaster Monitoring and Mechanism Simulation%Shaanxi Province Climate Center

Qiushui river in Yangxian;;HBV hydrological model;;Critical surface rainfall

Taking the Qiushui river basin in Yangxian county as an example,using the data of rainfall,water level,flow and temperature,this article built the rainfall-flow-water level relationship based on the HBV hydrological model. Setting"once every30 years","once every 50 years",and "once every 100 years"as the warning,guarantee,and overtopping standards of river water level design respectively,this paper determined the critical surface rainfall causing different levels of flood disaster. The parameters of HBV model were determined and verified by using the meteorological and hydrological data during 2004 ～ 2013,and these parameters were optimized according to the typical flood process. The determined and verified Nash coefficients were 0. 74 and 0.78 respectively,showing that the HBV model has a good application in this area. According to the determined critical surface rainfall indexes at different water levels in earlier period,the critical surface rainfall decreased as the water level in earlier period rose,revealing a non-linear response characteristic. Through the historical flood disaster verification,it is found that the HBV model can provide technical support for flood monitoring and early warning in the Qiushui river basin.