Study on Dynamic Variation of Soil Moisture in Rainwater Seepage
GAO Yan1,2, HU Xiao-lei1, LIU Ran3
1.Beijing Key Laboratory of Heating and Gas Supply Ventilation and Air Conditioning Engineering, Beijing University of Architecture; 2.Beijing Advanced Design Center for Advanced Urban Design; 3.Tsinghua University Architectural Design and Research Institute Co., Ltd.
Abstract：
The use of soil for the storage and infiltration of rainwater can reduce the peak runoff of urban drainage and can supplement groundwater. Based on the soil saturated-unsaturated infiltration theory, the dynamic variation of soil water content along depth and time is simulated under the condition of constant infiltration in the vertical direction. The moisture equation is used to establish the mathematical equations of water motion. The water-heat-force is added to the water equation through the moisture diffusion coefficient to perform iterative calculations. The soil column experiment is used to verify the simulation results. The results show that the model calculation results the measured results are highly consistent with a maximum error of 4.5%, indicating that this model can better describe the dynamic process of rainfall infiltration.
