Analysis of distribution characteristic of drought in Sichuan hilly area based on drought index and cloud model
Z index, an effective way for meteorological drought evaluation, adopts precipitation as a main index. However, the precipitation does not strictly follow normal distribution, and also the drought grade evaluated by Z index is under subjective influ-ence, so the simple value comparison can not reveal the drought distribution law objectively. For this reason, the cloud model theory with fuzzy membership analysis is combined with Z index analysis to reveal the spatial and temporal distribution of drought. The practical analysis results from drought change in 22 sites of Sichuan hilly area for nearly 60 years show that the drought type proportion, time series distribution and Z index series trend analysis can accurately depict the actual drought variation in the study area. The research method is feasible, which provides a better reference for the future evaluation of meteorological drought.
drought indexcloud modelSichuan hilly areatemporal and spatial distribution of drought
国家科技期刊平台
NSTL
万方数据
维普
