河流输沙量是指一定时段内通过河道某断面的泥沙数量称为该时段的输沙量，单位为千克或吨。河流输沙量的大小主要决定于水量的丰枯和含沙量大小。
河流输沙量的变化受流域降水和下垫面影响很大。
The variation of river sediment load is considerably affected by rainfall and underlying surface.
当支沟泥石流输入主河的泥沙量小于主河的输沙量时，主河河床将下切，并逐渐恢复山区性河流的特征。
The main channel bed will scour if sediment amount from tributary debris is less than that the main stream can carry and the river evolution exhibits the characteristic of mountainous rivers.
结果表明：泾河流域近50年来的输沙量略有下降，而径流量减少比较显著；
Results show that sediment yield decrease slightly but runoff yield increase obviously of Jinghe watershed nearly 50 years;
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