Study on Watershed Routing Based on Stochastic Theory

摘要

Hydrologic model parameters which are certain randomness were optimized by analyzed measured data. Nash model was based on the application of stochastic theory to study watershed routing for model parameters of stochastic problem. Parameter K as a random variable was introduced to the Nash model, set up a watershed routing model with random coefficient and derived a random expression of S curve in the situation of model parameters separately for the normal distribution and gamma distribution. I t was better result, the model was applied calculation of Yandu river basin, it was better result simulated rainfall runoff process with application of stochastic theory to give a mean and variance of process flow. It reflect the flow of a stochastic process influence of model parameters.