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Calculation method of unfrozen water content in permafrost based on ion concentration gradient of clay diffusion layer

A technology of ion concentration and calculation method, which is applied in the direction of soil material testing, measuring devices, instruments, etc., can solve the problems of increasing error in results, difficult application of unfrozen water model, and limitation of unfrozen water model application, etc., to achieve input parameters Less, simple expression, accurate calculation effect

Active Publication Date: 2022-03-22
NORTHWEST INST OF ECO ENVIRONMENT & RESOURCES CAS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, some seemingly simple unfrozen water models are difficult to apply in practice, that is, the input parameters of these models need to be re-run unfrozen water experiments in new locations
In addition, in the range of -1.5~0℃, the error of most semi-empirical unfrozen water models increases significantly
In summary, these factors limit the application of the unfrozen water model in cold regions.

Method used

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  • Calculation method of unfrozen water content in permafrost based on ion concentration gradient of clay diffusion layer
  • Calculation method of unfrozen water content in permafrost based on ion concentration gradient of clay diffusion layer
  • Calculation method of unfrozen water content in permafrost based on ion concentration gradient of clay diffusion layer

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Embodiment Construction

[0025] The method for calculating the unfrozen water content of frozen soil based on the ion concentration gradient of the clay diffusion layer includes the following steps:

[0026] (1) Collect soil samples, measure soil particle size distribution and humidity at room temperature, determine the mass percentage of clay, silt, and sand in the soil; and use the measured soil moisture as the initial water content w 0 .

[0027] Among them: the particle size of sand is greater than 0.05 mm; the particle size of silt is between 0.002 mm and 0.05 mm; the particle size of clay is less than 0.002 mm.

[0028] (2) Bring the mass percentage of clay, silt and sand in the soil into the specific surface area estimation model to obtain the specific surface area of ​​the soil A S . specific surface area of ​​soil A S It can also be replaced by direct measurement.

[0029] In many soil databases and laboratories, soil particle size distribution information is easier to obtain and measu...

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Abstract

The invention relates to a method for calculating the unfrozen water content of frozen soil based on the ion concentration gradient of the clay diffusion layer. The mass percentage of soil and sand; and the measured soil moisture as the initial water content w 0 ; (2) Bring the mass percentage of clay, silt and sand in the soil into the specific surface area estimation model to obtain the specific surface area of ​​the soil A S ; The specific surface area estimation model refers to A S =0.042+4.23 <base:italic / > Clay %+1.12 Silt %‑1.16 sand %, where: Clay %, Silt %, sand % are the mass percentages of clay, silt and sand respectively; (3) establish the following unfrozen water content model and calculate the unfrozen water content w u . The model expression of the invention is simple and the calculation is accurate.

Description

technical field [0001] The invention relates to frozen soil engineering, in particular to a method for calculating the unfrozen water content of frozen soil based on the ion concentration gradient of the clay diffusion layer. Background technique [0002] Changes in unfrozen water content affect the freeze-thaw cycle and hydrological cycle of permafrost in cold regions, the water and energy exchange between land and air, vegetation growth, and the structure and strength of permafrost soil. Due to inconvenient transportation and sparsely populated areas in cold regions (such as the Qinghai-Tibet Plateau, Siberia, the Arctic, etc.), it is difficult to obtain unfrozen water data on a wide range of spatial scales and long-term scales by deploying instruments. Therefore, the unfrozen water content calculated by the unfrozen water model is It is the main means of obtaining unfrozen water data in the fields of natural science and cold area engineering. [0003] Since engineers can...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/24
CPCG01N33/24G01N33/246
Inventor 靳潇杨文高晓清
Owner NORTHWEST INST OF ECO ENVIRONMENT & RESOURCES CAS