Rainfall infiltration soil column simulation system and unsatured hydraulic conductivity determination method

Abstract

The invention provides a rainfall infiltration soil column simulation system and an unsatured hydraulic conductivity determination method. The simulation system comprises a bottom structural element, one or several soil column experiment standardized structural elements which are connected to the bottom element and are connected in series connection, and an apparatus for simulating rainfalls of a plurality of forms at the top of the soil column experiment standardized structural elements; soil containing structural elements of the simulation system comprise a plurality of standard structural elements and are automatically controlled by a computer, and determination of rainfall infiltration coefficient and unsatured hydraulic conductivity can be realized based on the system; determination steps and computing methods are provided, undistributed soil column of large diameter is used for laboratory experiment during determination, devices for simulating rainfall of a plurality forms are used for simulating four kinds of hydraulic power boundary conditions, which comprise a low intensity rainfall full infiltration boundary condition, a middle intensity rainfall infiltration with runoff boundary condition, a high intensity rainfall stable infiltration boundary condition, and a snow melt infiltration boundary condition. The system and the method have the characteristics of good practicality, good usage effects, as well as promotion and usage convenience.

Description

technical field [0001] The invention belongs to the technical field of unsaturated soil, in particular to a precipitation infiltration soil column simulation system and a method for measuring unsaturated permeability coefficient. Background technique [0002] Precipitation mainly refers to rainfall and snowfall. Moisture reaches the ground from the atmosphere in various forms. Other forms of precipitation include dew, frost, hail, etc. Precipitation is an important part of the hydrological cycle and the basic source of water for human beings. Precipitation data is the basis for analyzing reasonable flood and drought conditions and basin drought conditions, and is also the basis for the planning, design, management and application of water resources development and utilization, such as flood control, power generation, irrigation, etc. The process of precipitation infiltration to recharge groundwater is one of the most basic links in the "three waters" mutual conversion relat...

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Problems solved by technology

No matter what kind of soil column is used for the test, there are still the following problems: ① The length of the single section of the soil-loading component in the soil column experiment is large, and the convenience is poor, so that the installation of the soil column is difficult, which causes inconvenience to the cleaning of the instrument; ② The installation of monitoring equipment is cumbersome and requires Drill holes in the soil column to destroy its structure; ③The monitoring equipment is generally manual observation, which makes the experiment accuracy low and artificial

However, due to the differences in the composition, structure and environment of unsaturated soil, it is difficult for the small specimens used in indoor experiments to represent the actual situation of the real soil.

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