Abstract:

Based on the four meteorological station (Badong,Lvcongpo,Enshi,Laifeng) and the surrounding three station (Wanzhou,Fengjie,Wufeng) nearly 54 years of precipitation data,using the climate trend rate analysis,ARCGIS of spatial analysis,Wavelet analysis and MannKendall Mutation analysis,the temporal and spatial variation,periodic variation and mutation of precipitation were analyzed.The result showed that the precipitation in Enshi since recent 54 years appeared downtrend and the trend was much more obvious after 1990s. From the temporal change,the amount of precipitation decrease in 1970s and 1990s was more than the amount of precipitation increase in the other times.Precipitation in winter showed obviously increasing trend,while the precipitation in other three seasons showed decreasing trends.From the spatial change,the rainfall mainly focused on the Lvcongpo area,and the precipitation is the least in the northeast of Badong and the part area of northwest of Lichuan,forming “a top two low” and the trend of decreasing from northeast to west area