基于信息熵理论的流域瞬时单位线

Watershed instantaneous unit hydrograph based on information entropy theory

基于流域汇流是一种受确定性和随机性因素影响的随机现象 ,从流域的瞬时单位线等价于水质点在流域内流达时间的概率密度函数入手 ,引入信息熵理论 ,提出了一种流域瞬时单位线。这种模型的数学表达式形同于Nash瞬时单位线 ,具有概念清楚 ,计算简单等优点 ,并且计算精度等同于Nash瞬时单位线 。

The confluence in a watershed is a random phenomenon affected by certain and random factors.Starting with the Watershed instantaneous unit hydrograph being equivalent to the probability density function of the reaching time of water particles in the watershed and based on the information extropy theory,a watershed instantaneous unit hydrograph model is established.The mathematical expression of this model is the same as Nash's instantaneous unit hydrograph in form,and has advantages of clear concept,simple computation,etc.,with its accuracy of computation equivalent to that of Nash's instantaneous unit hydrograph.This method can also be used for confluence computation in areas short of hydrological data.