Test device and method for simulating unsaturated zone transient flow-steady flow transformation mechanism
A test device, steady-state flow technology, applied in measurement devices, suspension and porous material analysis, instruments, etc., can solve the problems of cumbersome models, difficult to flexibly control infiltration conditions, and unintuitive indoor simulation, to achieve operability High, overcome the effect of unsustainable water supply
Active Publication Date: 2018-04-24
CHANGAN UNIV
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[0005] In order to solve the problems of cumbersome theoretical models, unintuitive indoor simulation, and difficulty in flexibly controlling infiltration conditions, the present invention provides a test device and simulation method for simulating the transition mechanism of transient flow to steady flow in unsaturated zones
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[0034] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0035] The flow of water in soil is affected by soil type, particle size characteristics, pore size and distribution, etc. There are countless studies on the influence of these factors on water flow, and a simple and clear explanation cannot be given. The present invention considers that, no matter there are various control factors, the flow of water in soil can be simplified as the transfer of water in a container that can accommodate a certain amount of water, and this transfer changes from wave transfer to In the end, the entire transfer system presents a stable state that conforms to the laws of mechanics, which is completely consistent with the flow characteristics of water in unsaturated soil, specifically in three stages (assuming no surface runoff is formed and all water infiltrates ), the first stage is the infiltration stage, at this ...
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Abstract
The invention discloses a test device and a test method for simulating unsaturated zone transient flow-steady flow transformation mechanism. The test device comprises an open glass bottle for simulating a soil body and a water supply device arranged above the open glass bottle; an outlet is formed in the bottom of the water supply device and is over against a water outlet pipe at the bottom of theglass bottle; a flow speed control valve is arranged on the water outlet valve; a glass bottle water outlet is formed in the bottom of the glass bottle; a rubber plug is arranged at the glass bottlewater outlet; a water discharge pipe and a water inlet pipe are arranged at the bottom of the water supply device; the top end of the water discharge pipe extends into an accommodating cavity of the water supply device; the water inlet pipe is connected between a water gate and the water supply device; flowing of water in unsaturated soil is generalized as a one-dimensional flow model of flowing of the water in an open hole container arranged vertically under the gravity action, hydraulic calculation and deduction are conducted by utilizing a water balance principle and a bernoulli equation toobtain the relation between the flow speed and the water level of any container units at any time, the model is verified through a test, and the result accords with the theoretical assumption and also conforms to an unsaturated soil seepage rule.
Description
technical field [0001] The invention relates to the technical fields of hydrogeology and engineering geology, in particular to a test device and method for simulating the transition mechanism of transient flow to steady flow in an unsaturated zone. Background technique [0002] The unsaturated zone is the necessary channel for groundwater to exchange with atmospheric precipitation and surface water, and is the link connecting surface water and groundwater. The unsaturated zone plays a pivotal role in groundwater science, environmental science, agriculture, forestry, water conservancy projects, and geological disaster prevention In addition, in the arid and semi-arid regions of Northwest my country, desertification and soil erosion are serious, and the ecological environment is extremely fragile. Therefore, the research on the law of water migration in the unsaturated zone is carried out, the quantitative evaluation of groundwater resources in this area, and the ecological effe...
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IPC IPC(8): G01N13/04G01N15/08
CPCG01N13/04G01N15/08
Inventor 王宇郭剑江睿君张亚国付昱凯张辉范江文李强沈月强乔志甜
Owner CHANGAN UNIV
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