【摘要】 采用Sen’s斜率估计法、Mann-Kendal趋势分析法、M-K突变检验法和Morlet小波变换对1951—2015年桂林市降雨侵蚀力进行特征分析、趋势估计、突变检验和周期分析。结果表明:近65年桂林市降雨侵蚀力呈不显著增大趋势,年际变差系数为0. 19,为中等程度变异; 20世纪90年代侵蚀力最强,80年代侵蚀力最小;年降雨侵蚀力自1968年以后呈增大趋势,分别在1968、2002和2015年发生了三次突变;雨季侵蚀力控制着年降雨侵蚀力的趋势;降雨侵蚀力存在34 a、56 a、12 a和3 a左右的周期。更多还原

【Abstract】 In this study,Sen’s slope estimation method,Mann-Kendal trend analysis method,M-K catastrophe test method and Morlet wavelet transform were used to analyze the characteristics,trend estimation,MK catastrophe test and periodic analysis of rainfall erosivity in Guilin from 1951 to 2015.The results show that the rainfall erosivity in Guilin has not increased significantly in the past 65 years,and the annual variation coefficient is 0. 19,which is a moderate variation. The erosivity in 1990 s is the strongest,and the erosivity in 1980 s is the smallest. The annual rainfall erosivity has increased since 1968,with three abrupt changes in 1968,2002 and 2015. The annual rainfall erosivity is controlled by the erosivity in the rainy season. The annual rainfall erosivity has a period of 34 a,56 a,12 a and 3 a.更多还原