鸭绿江流域水沙输运的“源-汇”特征及其影响因素的集成分析

以鸭绿江流域为尺度，对鸭绿江流域上中下游水沙数据进行综合性分析。结果显示：鸭绿江流域径流量中游比上游年径流量增加一倍左右，下游比上游的年径流量增加倍数为一个数量级以上；大部分年份下游的年输沙量小于上游；随着中下游水利工程等人类活动的加剧，鸭绿江下游径流量和输沙量都有阶段性的减少，年际径流量和年际输沙量差异幅度逐渐增大，且输沙量减小的幅度和年际差异幅度比径流量更大，尤其是自20世纪60年代中期以来人类活动对输沙量影响比较显著。结合ENSO事件特征，指出气候变化引起的降雨量的减少是直接影响流域径流量减少的主要原因，也一定程度上造成了流域输沙量的减少。

An integrated study of "source to sink" process for runoff and sediment discharge of the Yalu River drainage and influence factors

Taking the drainage basin of the Yalu river as a whole, this paper makes an integrated study of water and sediment discharges for the upstream, midstream and downstream of the river respectively. Results show that the annual runoff of the midstream is about two times higher than that of the upstream, and the annual runoff of the downstream is in an order of magnitude higher than that of the upstream. In most of the years, the amount of sediment in the downstream is less than that in the upstream. With the effects of the human activities such as the construction of water conservation projects in the middle and lower reaches, the downstream runoff and sediment transport of the Yalu river are stepwisely reducing. The difference between annual runoff and inter-annual sediment yield increases gradually, and the decrease and annual difference of sediment transport volume is greater than that of runoff. Especially since the mid-1960s, human activities have become stronger and rendered significant impacts on sediment transport. According to the characteristics of ENSO event, the decrease in rainfall influenced by climate change is the main cause of the decrease in runoff, and to some extent, effecting the decrease in sediment transport.