Development and Application on Water Balance Model of Grass-covered Soil Slope

Soil water balance models are especially important in the prediction of flood runoff,calculation of soil moisture content,design and management of irrigation and simulation of climate impact.An example of the development and application of soil water balance model used for a grass-covered soil slope in Newbury,UK,was introduced.Daily measured climate data are used to calculate potential evapotranspiration amount with FAO Penman-Monteith Equation.The model was calibrated and soil moisture change is consistent with time domain reflectrometry(TDR) data.The impacts of climate on potential evapotranspiration and soil water content under 2080's climatic condition were simulated with the model.The result shows that daily average potential evapotranspiration amount and soil moisture consumption will increase by(10.7%) and(16.8 mm) respectively in 2080.