Kohei HIROTA
Development of a Simplified Infiltration Model Considering the Soil Moisture Redistribution within a Soil Column
Minjiao LU
For run-off analysis, it is very important to know infiltration process of soil moisture to get more accurate representation. Usually, infiltration process can be computed by solving the Richards equation. Because this equation is strongly non-linear, the solving process of Richards equation is very time consuming. This study focuses on the soil moisture redistribution, and intends to develop a simplified infiltration model. In this study, moisture movement within a soil column is computed by numerically solving Richards equation. The results were then analyzed to know how suspended water (SW[L]) and moisture content change with time as result of soil moisture redistribution. Here, SW is defined as water that lie at up part of the soil column and will finally move downward to form hydrostatic soil moisture profile while capillary force and gravity balanced. As a result, it is found that decrease processes of SW and soil surface moisture can be represented by soil parameters of van Genuchten model. On the basis of these, the recession equation derived so far in this study, the soil moisture redistribution model including deficit of water within a soil column is constructed. This model can compute soil surface moisture, evaporation efficiency, SW and soil moisture deficit (SMD[L]) clearly faster than Richards”Ēs equation. It is shown that the values computed by this model represent with by Richards model very well. And the effects of various potential evaporation rates are also shown
Please use "previous botton" to return the previous page