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河道输沙同流域的产流、产沙特性紧密相联．受流域内植被、土壤、地质、土地利用状况及人类活动等因素的影响。流域产流面积的空间变化对其产沙、供沙的时空输入特性具有制约作用。不同的河段位置．河道的水力几何形态，非恒定的洪水波运动将直接影响到河道的输沙特性。水沙关系的基本经验模式为：Ｑｇ＝ＡＱｓｂ受其气候环境、区域环境及季节变化的影响，模拟及预报的精度受到限制。需从多因素、分散型模型应用的角度考虑加以改进。
The runoff and sediment production in the same river basin is closely linked. Affected by factors such as vegetation, soil, geology, land use and human activities in the basin. The spatial variation of the runoff area in a river basin has a constraining effect on the time-space input characteristics of sand production and sand supply. Different sections of the river. The hydraulic geometry of the channel and the unsteady flood wave movement will directly affect the sediment transport characteristics of the channel. The basic empirical mode of water-sand relationship is: Qg = AQsb The accuracy of simulation and prediction is limited by its climate, regional environment and seasonal variation. It needs to be improved from the perspective of multi-factor and decentralized model application.