Model of risk assessment for agricultural drought based on two-layer soil computing model

Current assessment models for agricultural drought were discussed by this paper. Calculation model of water movement based on two-layer soil was established to describe the regulations of crop evapotranspiration variation, taking advantage of the theory of “soil-crop-atmosphere continuum”. On basis of the model, risk assessment static and dynamic models for agricultural drought were proposed by crop water production function, considering weight of each crop. Results showed that models could be used to evaluate uncertainly drought extent in any time scale in future, and provide information of production loss. It is significant to spread the risk assessment models.