Discontinuous unsaturation soil rainfall infiltration physical simulation system and measuring method

Abstract

The invention provides a discontinuous unsaturation soil rainfall infiltration physical simulation system and a measuring method. The discontinuous unsaturation soil rainfall infiltration physical simulation system comprises a testing soil groove, a bleed-and-feed system and a measuring system, the measuring system comprises a soil water potential measuring unit, a soil moisture measuring unit, awater head measuring unit, a soil temperature measuring unit, a soil moisture diffusion measuring unit, a data acquisition instrument and a data storage computer. According to the discontinuous unsaturation soil rainfall infiltration physical simulation system and the measuring method, a researcher can be helped to better understand related conception of unsaturated zone unsaturation seepage experiment and unsaturated zone rainfall infiltration preferential flow under the condition of understanding a discontinuous medium, permeability coefficients, soil matrix potential, soil moisture horizontal diffusion speed and the like of soil can be measured in practical application, the diffusion rate, an infiltration curve and a motion equation of unsaturation soil moisture are studied by using a measuring result, and stable data support is provided for studying the influence of soil characteristics at different collapse stages on unsaturated zone moisture displacement.

Description

technical field [0001] The invention relates to the field of hydrogeological research, in particular to a physical simulation system and a measurement method for non-continuous and non-saturated soil rainfall infiltration. Background technique [0002] The infiltration of the vadose zone is an important process of the hydrological cycle, which affects the distribution relationship among rainfall, runoff, infiltration, evapotranspiration and groundwater recharge, and the soil moisture content is the key factor affecting these hydrological processes; A large number of cracks and fissures are generated, which cause changes in the physical properties of the soil in the vadose zone. The cracks and fissures change the rainfall infiltration process, resulting in changes in the vertical infiltration and water diffusion process in the vadose zone. Mining subsidence causes changes in the soil structure of the vadose zone. The soil matric potential changes accordingly. On the one hand,...

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Problems solved by technology

[0003] As the main research method for this kind of problem, indoor physical simulation has many advantages. In recent years, a large number of indoor devices for infiltration simulation of vadose zone have emerged at home and abroad, such as indoor soil column test, but this instrument can only simulate one-dimensional Water movement; such as seepage troughs, but it focuses on the change of soil water content and solute migration, without considering the discontinuity of the soil medium in the vadose zone, the impact of collapse cracks on the matrix potential of the vadose zone, and the collapse situation cannot be achieved The function of simultaneous online monitoring of various parameters of the aerated zone soil cannot comprehensively measure the rainfall infiltration in the aerated zone. Therefore, the present invention proposes a physical simulation system and measurement method for the rainfall infiltration of discontinuous and unsaturated soil. To solve the deficiencies in the existing technology

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