Research of complex stochastic water environmental risk model

Based on the Shastry non-linear water quality model, this paper introduces the concept of stochastic force and establishes stochastic differential equation, then preliminarily investigates the influences on water environmental risk. The relation between the time and exceedance possibilities of the concentration can be obtained through solving this model. Then the influences of stochastic force are compared between the linear and non-linear system. And then the results show that a small force can greatly change the fate of non-linear system.