This paper analyzed the runoff and sediment composition in the Dahuangjiangkou-Wuzhou Reach of the Xijiang River, and used the non-uniformity coefficient to analyze their annual change, studied on the relationship between the precipitation, annual runoff and sediment, analyzed the influence of the human activities on the runoff and sediment using double cumulative curve; used Morlet Wavelet to analyze the mutation of the annual runoff and annual sediment at the Wuzhou Station, and quantitatively analyzed the effect of the precipitation and human activities on the runoff and sediment changes by using hydrological analysis method. The results show that the distribution of the runoff and sediment obviously changed after the Changzhou key water control project working in 2006, the annual runoff and annual sediment distribution has non-uniformity, climate variation is one of the main reasons for annual runoff and annual sediment changing, the annual sediment change of the Xijiang River is the results of the human activities effecting onbasin erosion producing sand when there is not precipitation change effecting.%分析了西江大湟江口-梧州段水沙组成,并采用不均匀系数分析其年内变化;通过相关分析研究降水与年径流量及年输沙量的关系;利用双累积曲线分析人类活动对水沙的影响;利用Morlet小波对梧州站年径流量及年输沙量进行突变分析;采用水文分析法量化降水与人类活动对水沙变化的影响.结果表明:2006年长洲水利枢纽正式运行导致地区水沙分布发生明显变化;年径流量和年输沙量年内分配具有一定的不均匀性;气候因素的变化只是西江年径流量和年输沙量变化的主要原因之一;在不受降水变化影响的情况下,西江年输沙量的变化,主要是人类活动影响流域侵蚀产沙的结果.
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