Three-dimensional experimental device for karst water movement and solute transport process under the influence of human activities

Abstract

The invention discloses a three-dimensional test device for karst water movement and a solute transport process under the influence of human activities. The three-dimensional test device includes a test tank, a rainfall recharge system, an upstream water supply tank and a data acquisition system. The test tank comprises a tank body and a water-containing medium filled in the tank body. The tank body is formed by splicing of module plates to form a karst area boundary, the upstream water supply tank supplies boundary flow to the water-containing medium, and the bottom of the tank body is provided with a plurality of mining / reinjection wells. The water-containing medium includes waterproof silica sand bricks and high permeability strips arranged on the silica sand bricks. No-filling groovesare dug inside the silica sand bricks, and the high permeability strips and the no-filling grooves together form a crack-pipeline network. The rainfall recharge system is used for providing planar rainfall to the water-containing medium. The three-dimensional test device can simulate karst water movement and a solute transport process under different research scales and different boundary conditions, also ensures that water flow is laminar and controllable, and takes the influence of human activities upon the karst water movement process into consideration.

Description

technical field [0001] The invention relates to a test device, in particular to a three-dimensional test device for karst water movement and solute migration process under the influence of human activities, and belongs to the field of karst water seepage and solute migration research devices. Background technique [0002] The karst water-bearing system is a multiple and complex system. The water-bearing medium is usually composed of multiple voids such as pipelines, underground rivers, large fissures, micro-cracks, and pores. It is highly heterogeneous and anisotropic, and the hydrodynamic parameters show a significant scale effect. The water flow includes pore Darcy flow, fissure flow, pipeline flow of underground river, etc. The water flow movement is extremely complex and has the characteristics of multiphase water flow mixing. At the same time, the pollution of karst water environment is intensifying, the conflict between social development and the environment is intens...

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Problems solved by technology

[0003] As an important method to study water flow and solute migration in karst water-bearing system, physical experiment has been widely used. At present, the physical experiment research on the law of karst water movement and solute migration mostly uses crack-pipelines constructed of plexiglass or rock blocks. As a medium, there are several deficiencies in the following aspects: the flow state in the fracture area is not easy to control under laboratory conditions; the determination of the fracture width is not uniform in academics; it cannot reflect the disturbance of human activities on the karst water-bearing system; it cannot reflect the conditions of different boundaries and different scales. Differences in karst water movement and solute transport processes

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