Soil hydraulic property prediction method based on cutting ring soil sample infiltration process

Abstract

The invention relates to a soil hydraulic property prediction method based on a cutting ring soil sample infiltration process, which adopts a brand new design method and is based on an inverse process of homogeneous dry soil one-dimensional moisture infiltration analytical solution under a constant water head boundary condition. By recording data of the accumulated infiltration amount and time in the upward infiltration process of the cutting ring soil sample and the time for a wetting front to reach the upper surface of the soil sample, the saturated hydraulic conductivity of the soil sample is measured, and the hydraulic characteristics of the soil are rapidly obtained, so that the problems of long time consumption, low efficiency, unsuitability for large-area rapid field acquisition and the like in the prior art for measuring the hydraulic characteristics of the soil are solved; the problems of multiple solutions, non-convergence and the like of parameters are avoided, the acquisition efficiency of the hydraulic characteristics of the soil is improved, and an effective means is provided for large-area investigation of the hydraulic characteristics of the soil in the field.

Description

technical field [0001] The invention relates to a method for predicting soil hydraulic characteristics based on the infiltration process of a ring knife soil sample, and belongs to the technical fields of soil physics and soil hydrology. Background technique [0002] The soil moisture characteristic curve is the quantification and characterization of the soil pore structure, and the imbibition rate is the measure of the soil pore structure's ability to absorb and deabsorb liquid. How to obtain soil hydraulic characteristic parameters (soil moisture characteristic curve, saturated / unsaturated hydraulic conductivity, infiltration rate) accurately, quickly and at low cost is the key to help us understand the movement of soil water and fertilizer in the vadose zone. Ring knife sampling and indoor analysis are currently the most effective methods to obtain complete soil hydraulic characteristics parameters, but traditional measurement methods require the use of expensive equipmen...

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Problems solved by technology

However, due to the limitations of current inversion techniques in terms of theoretical methods, it is difficult to meet the immediate and efficient survey needs of large-scale soil surveys.

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