Method for evaluating matrix flow and preferential flow degrees of earth and stone binary medium

Abstract

The invention relates to a method for evaluating matrix flow and preferential flow degrees of an earth and stone binary medium and belongs to the field of soil hydrodynamics. An actual flow mode of water infiltration is characterized with brilliant blue and potassium iodide. Researches show that, water transfer is mainly completed by virtue of actions of matrix flow, preferential flow, matrix-preferential mixed flow and water diffusion, while under the earth and stone binary medium condition, the water diffusion action has less influence and can be neglected. Therefore, a preferential flow water transfer mode is characterized by a Blue-FCF staining profile, a matrix flow-preferential flow mixed transfer mode is characterized by a potassium iodide staining profile, and then the potassium iodide staining area except the Blue-FCF staining part is considered as a matrix flow dominant area. Based on the principle, by virtue of an image processing technology, the invention provides a methodfor calculating a matrix / preferential flow contribution ratio (respectively represented by CR matrix flow and CR preferential flow) and a matrix / preferential flow infiltration path relative quantity ratio, thereby evaluating the matrix / preferential flow degree of the earth and stone binary medium.

Description

technical field [0001] The invention relates to a method for evaluating the degree of matrix flow and preferential flow in soil-rock binary medium, belonging to the field of soil hydrodynamics. Background technique [0002] The water cycle process is affected by the soil medium mainly in the configuration of the soil medium to the water cycle flux. Under the condition of soil-rock binary medium in mountainous areas, the water flux process has dual characteristics of matrix flow and preferential flow. These two soil water redistribution processes mainly depend on the hydrological structure characteristics such as the area of ​​matrix flow and preferential flow dominant area, the number of infiltration paths, etc. parameter. At present, there are two main methods for evaluating the degree of matrix flow and preferential flow: direct method and indirect method. The direct method generally adopts the dyeing and tracing technology based on image processing methods. The water fl...

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Problems solved by technology

At present, there are two main methods for evaluating the degree of matrix flow and preferential flow: direct method and indirect method. The direct method generally adopts the dyeing and tracing technology based on image processing methods. The water flow migration mode represented is limited, so it is difficult to distinguish the matrix flow from the preferential flow in the soil-rock binary medium; the indirect method often uses numerical simulation, and uses different mathematical models to analyze the water flow in the seepage medium. Carry out simulation analysis, and then evaluate the contribution of matrix flow and preferential flow to the water infiltration process, but the model simulation requires many parameters, and most of the parameters are difficult to obtain

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