Analysis of Characteristics of Temporal-spatial Drought Distribution in Anhui Province Based on Cloud Model
Based on the daily rainfall data of the 14 typical rainfall sites from 1962 to 2013 in Anhui Province,precipitation anomaly percentage was used to analyze the characteristics of the spatial and temporal distribution of drought.Then the cloud model was introduced to analyze the characteristics of the spatial and temporal distribution of drought,and the indices of homogeneity and stability were used for reflecting characteristics of temporal-spatial distribution of drought.The characteristics of the spatial distribution of drought at annual and seasonal time scale were analyzed with ArcGIS software by the inverse distance weighting method.The results show that the annual variation of drought has a fluctuation and decreasing tendency in Anhui Province.The homogeneity of the annual drought is the best and spring is the worst.The stability of drought in summer is the best,followed by annual and spring drought,and the worst is autumn and winter.Seeing the difference characteristics in the space using the homogeneity,we find that the drought of Wanbei area is the worst and Wannan area is the best.But the stability of drought in Wanbei area is the best and Wannan area is the worst.Generally,the frequency of drought in Anhui Province descends from north to south.
characteristics of temporal-spatial distribution of droughtprecipitation anomaly percentagehomogeneitystabilitycloud modelAnhui Province
NETL
NSTL
万方数据
维普
