漓江上游小溶江水库流域降雨变化分析

Analysis of river basin precipitation change for Xiaorongjiang Reservoir on upper reach of Lijiang River

采用线性趋势法、Mann-Kendall分析法和小波分析法对漓江上游小溶江水库流域金石、砚田、塔边雨量站1979-2018年共40年的降雨资料的趋势变化、突变特征及周期特征进行分析。结果表明:过去40年,漓江上游小溶江水库流域内,金石站降雨呈不显著的下降趋势,砚田站降雨呈不显著的上升趋势,塔边站降雨呈显著的上升趋势;金石、砚田、塔边雨量站的降雨序列分别在2000、2011和1989年发生突变;金石站降雨存在23 a、8 a的2个主周期,砚田站降雨存在19 a、5 a主周期,塔边站降雨存在22 a、17 a、6 a的3个主周期。

Three precipitation stations of Jinshi,Yantian and Tabian are within the Xiaorongjiang Reservoir basin on the upper reach of Lijiang River.Their precipitation records of 40 years from 1979 to 2018 were analyzed by linear tendency method,Mann-Kendall analysis method and Wavelet analysis method to study he change tendency,mutation and cycle features of precipitation.The results of analysis demonstrate in the past 40 years,rainfall show an insignificant downward trend at Jinshi station,an insignificant upward trend at Yantian station,an significant upward trend at Tabian station.Mutation of precipitation series occurred in 2000,2011 and 1989 for Jinshi,Yantian and Tabian respectively.There are two precipitation principal periods of 23 a and 8 a for Jinshi station.Rainfall at Yantian station has two principal periods of 19 a and 5 a.There are three principal periods of 22 a,17 a and 6 a for Tabian station.