BP network model for soil water-salt movement with a shallow groundwater table

Aiming at some problems of modeling soil water-salt movement with a shallow groundwater table, a BP network model was introduced for modeling and forecasting field soil water-salt in the crop root region at the depth from 0 to 60 c m and from 0 to 100 cm. The BP network input factors are the mean values of soil water content and salinityin preliminary period, groundwater level and salinity, evaporation of water surface, rainfall(including the amount of irrigation) during the period, and the day series of crop growth duration, the output factors are the mean values of soil water content and salinity. The results show that BP network model may deal with the complex relation well between soil water-salt movement and its influencing factors. The model may forecast field soil water-salt movement accurately. This study offers an effective and feasible method for analyzing soil water-salt movement and is a supplement for the traditional dynamic study of soil water-salt movement.