漓江流域上游径流变化分析

利用桂林水文站、大溶江水文站、灵渠水文站的多年实测径流资料,采用统计分析法、Mann-Kendall非参数检验法,分析漓江流域上游径流年内分配和年际变化特征。计算结果表明:漓江流域上游径流年内分配极不均匀,不均匀系数C_n的范围为0.73~0.78;径流年际变化相对比较均匀,且均匀程度相似,变差系数C_V值的范围为0.19~0.21,年极值比K的范围为2.53~2.69;1954~2016年漓江流域上游径流量整体呈现上升趋势;桂林水文站在1991年前后发生突变,大溶江水文站在1958,1963年等年份发生突变,灵渠水文站在1968年等年份发生突变。

Variation characteristics of runoff in upper reaches of Lijiang River Basin

Based on the measured runoff data of Guilin, Darongjiang and Lingqu hydrological stations in the upper reaches of the Lijiang River basin, this paper analyzes the annual and inter-annual runoff variation using statistical analysis method and Mann-Kendall nonparametric test. The results show that the annual distribution of runoff in the upper reaches of the Lijiang River basin is uneven, and the non-uniformity coefficient ranges 0.73 ~ 0.78. The inter-annual variation of runoff is relatively uniform, and the uniformity of the three stations is similar, the variation coefficient ranges 0.19 ~ 0.21, and the annual extreme ratio ranges 2.53 ~ 2.69. The runoff of the upper reaches of the Lijiang River basin has an increasing trend from 1954 to 2016 as a whole and the runoff at Guilin hydrological station mutated in 1991, Darongjiang hydrological station in 1958 and 1963, and Lingqu hydrological station in 1968.