Study on the Model of Soil Water Resources Quantity in Baoding Plain

摘要

The soil water resources has special properties, independent of surface water resources and groundwater resources. The relationship between soil water resources and soil water, the concept and characteristics of soil water resources have been analyzed and the model calculating the soil water resources quantity under the natural condition has been put forward based on the principle of water balance principle in this study. The model parameters have been focused on. Firstly, the daily precipitation has been determined based on typical year. Secondly, the surface runoff has been applied on the basis of the hydrological model of runoff yield in excess of infiltration. Thirdly, canopy interception rainfall has been concluded according to canopy interception model. Fourthly, the water quantity of infiltrated out of the assessment layer has been calculated based on the hydrological model of runoff yield at natural storage. The model has been applied to the work of soil water resources assessment of Qingyuan county in Baoding plain and the result has showed that the soil water resources quantity in mean precipitation year is 301.1485 million m~3 and its temporal distribution is consistent with the distribution of rainfall of the year.