Method for calculating suction of infiltration wetting front of soil and spurt volume of rainfall

Abstract

The invention provides a method for calculating the suction of infiltration wetting front of soil and the spurt volume of rainfall. The method comprises the following steps: measuring and recording changes of the volume of water supply with infiltration time by using a double-loop infiltration experiment and calculating an infiltration amount accumulated in real time; fitting necessary parameters according to the infiltration time and the infiltration amount accumulated in real time; calculating the suction of the infiltration wetting front based on the fitted parameters and fixed infiltration water head height; calculating saturated hydraulic conductivity of soil based on the fitted parameters, initial water content of soil and soil porosity; and calculating the spurt volume of rainfall on the basis of the suction of the infiltration wetting front, the saturated hydraulic conductivity of soil, rainfall intensity, initial water content of soil and soil porosity.

Description

Technical field [0001] The present disclosure relates to the determination of soil parameters of a hydrological rainfall runoff generation model, and particularly relates to a method for calculating soil infiltration wet peak suction and initial rainfall loss based on double loop infiltration. Background technique [0002] my country is one of the countries with the most frequent storms and floods, and timely and accurate forecasting and warning of flood disasters is very important to reduce disaster losses. One of the key issues in flood disaster forecasting and early warning is to accurately simulate the rainfall runoff process. The Green-Ampt model is a runoff model with a clear physical mechanism. However, it is difficult to determine the fixed suction parameters of the wet peak, which severely limits the application of this model. The traditional double-loop infiltration experiment can only test the saturated hydraulic conductivity of the soil, and cannot determine the fixe...

AI Technical Summary

Problems solved by technology

The Green-Ampt model is a runoff model with a clear physical mechanism, but it is difficult to determine the fixed suction parameters of the wet peak, which severely limits the application of the model

The traditional double-ring infiltration test can only test the soil saturated hydraulic conductivity, and cannot determine the fixed suction parameters of the wet peak in the Green-Ampt model, which is difficult to meet the soil parameter requirements of the Green-Ampt model applied to watershed hydrology.

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