Simulation Model Of Soil Moisture In A Field

Experiments were conducted to study the change of soil moisture in a field whose soil is thin and sandy , Erqisi River basin. From 2002 to 2003,based on the observed data of irrigation, soil moisture and depth of underground water level, we analysed the change of soil moisture and groundwater level which were caused by irrigation in growing period of crop, in order to study the change law of soil moisture. Based on physical concept and hydrology model,the simulation model of soil moisture was constructed. The model is an use of the hydrology model and simulate the change of soil moisture, simulating infiltration and evaportranspiration in a field scale. We simulated the everyday change of soil moisture, inputing irrigation, meterological data and prophase soil moisture in 2003. Contrasted the spot observation data of soil moisture with simulation result, showed that they had a similar tendency by irrigation, and the simulation model of soil moisture had a good effect. By simulating the change of soil moisture, we could verify and improve the crop irrigation schedule. According crop water requirement, the depth of irrigation plan and the condition of soil moisture, we could forecast irrigation water demand and irrigation time .