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Simulation system and method for on-site simulation of frozen soil environment

A technology of simulation system and soil, applied in the field of simulation system, to achieve the effect of avoiding serious errors

Pending Publication Date: 2021-11-02
NORTHWEST INST OF ECO-ENVIRONMENT & RESOURCES CAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In order to solve the problems existing in the measurement of the frozen soil area by the existing lysimeter technology, the present invention proposes a simulation system and method for simulating the frozen soil environment on site

Method used

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  • Simulation system and method for on-site simulation of frozen soil environment
  • Simulation system and method for on-site simulation of frozen soil environment
  • Simulation system and method for on-site simulation of frozen soil environment

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Experimental program
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Embodiment 1

[0046] This embodiment is a simulation system for simulating the frozen soil environment on site, such as figure 1 shown. This embodiment includes: a protective box ( figure 1 The protective box is not drawn in the middle) and the sampling box 1, the cylindrical container 2 that holds the soil column is arranged in the described sampling box, the bottom of the cylindrical container is provided with a weighing device 3, and the upper part of the soil column is It is undisturbed undisturbed soil 201, the lower part of the soil column is a boundary control layer 202 filled with prepared soil, and a plurality of water potential sensors 4 are evenly distributed in different depths in the soil column and in the environmental soil outside the sampling box ( figure 1 Indicated by small squares), moisture sensor 5 ( figure 1 Indicated by a small circle), the infiltration pipe 6 and the temperature regulation pipe 7 are evenly distributed in the prepared soil, the infiltration pipe is...

Embodiment 2

[0062] This embodiment is an improvement of the first embodiment, and is a refinement of the cylindrical container in the first embodiment. The bottom of the cylindrical container described in this embodiment is closed, the upper end is open, the cylinder wall is made of non-thermal conductive material, and the inner wall is provided with a porous corrugated coating.

[0063] The cylindrical container is a key component for loading experimental samples, and hard engineering plastics such as PVC can be used. The inner wall of the cylindrical container is provided with a porous corrugated coating to fix the soil sample.

Embodiment 3

[0065] This embodiment is an improvement of the above embodiment, and is a refinement of the above embodiment regarding the boundary control layer. The boundary control layer described in this embodiment includes: hard enclosure, filled with the soil moisture freeze-thaw characteristic curve and gradation of the environmental soil in the hard maintenance, the top and bottom of the hard enclosure Separately set the insulating wire mesh.

[0066] The boundary control layer is an important part of the simulation. Its core is to make the soil moisture freeze-thaw characteristic curve of the experimental soil column consistent with the soil moisture freeze-thaw characteristic curve of the environmental soil. The method to keep the two consistent is to change the particle size of the prepared soil Grading, through repeated freezing and thawing experiments, the soil can be prepared consistent with the soil moisture freezing and thawing characteristic curve of the environmental soil. ...

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Abstract

The invention relates to a simulation system and method for on-site simulation of a frozen soil environment. The system comprises a cylindrical container for containing a soil column, the bottom of the cylindrical container is provided with a weighing sensor, the upper part of the soil column is undisturbed undisturbed soil, and the lower part of the soil column is a boundary control layer filled with prepared soil; a plurality of water potential sensors and moisture sensors are uniformly distributed in the soil column and environmental soil outside a collecting box at different depths, and percolation pipes and temperature adjusting pipes are uniformly distributed in the prepared soil. The soil temperature and the soil water content in the frozen soil freezing and thawing process are physically controlled, the soil column boundary hydrothermal state the same as that of the environmental soil is achieved by controlling and monitoring the hydrothermal balance of the soil column, the specially-prepared boundary control layer provides the hydrothermal transmission condition consistent with that of the environmental soil for the soil evaporation and permeation process of the soil column, the control of the unsaturated hydraulic conductivity in the monitored soil column is realized, so that the analog simulation of the field frozen soil environment is realized.

Description

technical field [0001] The invention relates to a simulation system and method for simulating frozen soil environment on site, is a system and method for hydrological measurement, and is an experimental system and method for testing evapotranspiration of the underlying surface of frozen soil in cold regions. Background technique [0002] The difference between frozen soil and farmland soil lies in its complex multiphase and multicomponent system. It is a complex heterogeneous system composed of solid, liquid and gas three-phase substances. Its basic components are mineral framework or organic framework, ice, Unfrozen water and gas. During the freezing process of soil, there will be a phase transition process from water to ice, and the existence of ice will greatly change the hydraulic and thermodynamic parameters of the soil. The main reason is that the thermal conductivity of ice is about 4 times that of water, and the heat conduction of the frozen soil layer is gradually ...

Claims

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Application Information

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IPC IPC(8): G01N33/24G01N25/20G01D21/02
CPCG01N33/24G01N25/20G01D21/02
Inventor 何晓波丁永建汪少勇谭昌海洪晓峰覃小林
Owner NORTHWEST INST OF ECO-ENVIRONMENT & RESOURCES CAS
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