柏叶口水库控制流域1952-2021年径流特征

Runoff Characteristics of the Controlled Watershed of Baiyekou Reservoir from 1952 to 2021

本文利用多种指标对柏叶口水库控制流域1952-2021年(70 a)的径流资料进行年内年际变化特征分析。采用线性相关检验法、Mann-Kendall检验法、Spearman秩次相关检验法对柏叶口水库径流量变化趋势分析,利用Mann-Kendall突变检验对柏叶口水库径流量进行变异分析,采用小波变换对柏叶口水库径流量进行周期性分析。结果表明:柏叶口水库径流年内分配极不均匀,径流主要集中在7-9月,多数年份径流量峰值出现在8月,少数年份径流量峰值出现在7月、9月,极个别年份径流量峰值出现在10月。70 a来,柏叶口水库年径流量总体上呈现较为显著的下降趋势,突变年份为1970年,主要周期为4 a、7 a和37 a,在37 a的时间尺度下,2019年以后柏叶口水库入库径流偏少。

This article uses multiple indicators to analyze the interannual variation characteristics of runoff data in the control basin of Baiyekou Reservoir from 1952 to 2021 for 70 years.Linear correlation test,Mann Kendall test and Spearman rank correlation test are used to analyze the variation trend of runoff of Baiyekou reservoir,The Mann Kendall mutation test is used to analyze the variation of runoff of Baiyekou reservoir,At the same time,wavelet transform is used to analyze the periodicity of runoff in Baiyekou Reservoir.The results showed that:The runoff of Baiyekou reservoir is unevenly distributed throughout the year.The runoff is mainly concentrated from July to September.The peak value of runoff in most years occurs in August,the peak value of runoff in a few years occurs in July and September,and the peak value of runoff in a few years occurs in October,The annual runoff of Baiyekou reservoir generally shows a significant downward trend in the past decade.The mutation point year is 1970,and the main cycle is 4 years,7 years and 37 years.On a time scale of 37 years,the inflow runoff of the Baiyekou Reservoir will be relatively low after 2019.