Comprehensive evaluation index on temporospatial analysis of drought in Weihe River Basin
Taking the Weihe River Basin as the research object and based on the monthly rainfall, runoff and evaporation data at 21 meteorological and 5 hydrological stations from 1961 to 2010,considered meteorological drought (precipitation anomaly percentage, standardized precipitation index and revise Palmer index) and hydrological drought index (river inflow anomaly percentage),a comprehensive drought index (CDI) is built to compute the monthly CDI with fuzzy comprehensive evaluation method; and then the reliability of CDI is verified. Based on comprehensive drought index, the trend of temporospatial variation in Weihe River Basin is analyzed. The results show that the districts of drought from heavy to light are the midstream of Weihe River, Jinghe River, the upstream of Weihe River, the downstream of Weihe River, Beiluo River. Timescale,1990s is rapidly increased and severe drought is 1986,1995 and 1997. The basin arid is mainly concentrated in the spring, autumn and April,November. The research results can provide a reference for the prevention of the extreme drought events in Weihe River.
Weihe River Basincomprehensive drought evaluation indexfuzzy comprehensive methoddistricts of droughtdrought trend
NETL
NSTL
万方数据
维普
