Spatiotemporal Distribution of Precipitation in Xihe Basin over the Last 50 Years
Based on the precipitation observation data of 5 precipitation stations in Xihe basin in recent 50 years (1966-2015 years),linear trend method,moving average method and cumulative anomaly analysis were used to analyze the variation trend of precipitation for reasonably utilizing regional precipitation resources.And then the abrupt change of precipitation was analyzed by the Mann-Kendall method.Finally,the characteristics of spatial distribution were analyzed by using spatial interpolation method.We found that the precipitation in Xihe Basin mainly concentrated in the summer,and it accounts for 83％ of the annual precipitation;for the seasonal variation trend,5 stations is different in the four seasons change trend,but most of stations show upward trend in winter;according to the Mann-Kendall test,average precipitation Z values in Xihe basin is 0.659,precipitation appear upward trend with time,and five stations have sudden change point;the spatial distribution is uneven,overall it decreases from southeast to northwest.The results provide a scientific basis for management of precipitation in this area.
Xihe riverprecipitationvariation trendspatial distribution
NETL
NSTL
万方数据
维普
