Ryo ISHIZAKI
The Soil Moisture Redistribution in the Soil and Soil Surface Using the Numerical Solution of Dimensionless Richards Equation
Minjiao LU
Soil moisture is an important hydrological values. It affects inflow, outflow, groundwater recharge and amount of evaporation. And Soil infiltration make a big change by soil water profile to be formed by soil water redistribution just before, and it decide flow quantity in dry season to influence groundwater cultivation. So it must consider physical quantity in highly precise runoff analysis and a flood prediction. The soil infiltration analysis generally uses the Richards¡Ç equation, the governing rule equation of the unsaturated water movement, but Richards¡Ç equation is highly non-linear, getting general solution is very difficult. Because calculation time becomes enormous to solve the Richards equation on a basin scale in high spatial and temporal resolution.
Therefore, this research designs dimensionless for simplification of the analysis, and examine of the usefulness. There is an advantage to decrease soil parameter to examine no dimension in the case of modeling by becoming it. Soil infiltration model of Richards¡Ç equation made dimensionless construct, examine the water movement for 12 kinds of soil. Here examined about transition amount of moisture in the soil moisture redistribution and soil surface, using soil infiltration model, and evaluate it using a suspended water and soil moisture deficit for an index of the soil moisture redistribution. By the numerical value solution which was provided from soil infiltration model, analyze each index quantitatively and considered redistribution and the relations with the soil parameter by the numerical value solution which was provided than a model.
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