Method and device for measuring dynamic coefficient of unsaturated soil turbulence
A technology of mechanical coefficients and measurement methods, which is applied in the direction of measuring devices, soil testing, scientific instruments, etc., can solve the problems of reduced applicability of parameters, and achieve the effect of accurate mechanism
Inactive Publication Date: 2020-02-14
WUHAN UNIV
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Problems solved by technology
For the equivalent parameters, it is only suitable to use the parameters to describe the solute migration in the soil under similar conditions to the test conditions, and when the actual soil conditions are quite different from the test conditions, the applicability of the parameters is significantly reduced
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[0036]The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments. The following examples will help those skilled in the art to further understand and implement the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.
[0037] Step 1: Carry out soil sample filling, the experimental device is as attached figure 1 As shown, during the experimental filling, through the control of initial soil moisture content, bulk density control and unsaturated permeability control, the phenomenon of layering and unevenness of each section caused by the strong spatial variability and anisotropy of the soil structure can be eliminated. :
[0038] 1.1, Soil initial moisture content control: After t...
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Abstract
The invention provides a method and device for measuring the turbulence dynamics coefficient of unsaturated soil. The method includes the following steps: filling soil samples; arranging monitoring sites at certain intervals, and each monitoring site is equipped with a soil matrix potential monitoring system and a soil indicator. The tracer solute concentration monitoring system is used to continuously monitor the changes in soil moisture content and tracer solute concentration in the soil at each monitoring site; divide the sections, measure the soil matrix potential on the upper and lower boundaries of each section, determine the water potential difference and the concentration of each section Water movement flux; calculate any moment based on the water movement flux at each section t The average cross-section moisture flux; the soil negative pressure is converted into soil moisture content, and the measured average cross-section moisture flux is further coupled, and finally the turbulent kinetic coefficient of solute migration at each test site is obtained through the formula. The method establishes a mathematical model that is easy to operate and has high measurement accuracy. The experimental model is easy to build, the conditions are easy to implement, the samples are rich and diverse, and the results are intuitive.
Description
technical field [0001] The invention belongs to the technical field of soil quality detection, in particular to a method and device for measuring the dynamic coefficient of unsaturated soil turbulence. Background technique [0002] With the development of agricultural production and the improvement of scientific and technological level, it is required to rationally fertilize farmland, economic irrigation and effective prediction and control of soil salinization, prevention and control of soil and groundwater pollution caused by pesticides, chemical fertilizers and wastewater irrigation, and soil solutes with surface runoff Migration, causing water pollution and soil productivity reduction, has become a common concern in the world today. This research involves the study of soil solutes. The most extensive research on soil solutes is the use of mathematical models to simulate soil solute movement, in which the hydrodynamic diffusion coefficient is one of the indispensable par...
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IPC IPC(8): G01N33/24
CPCG01N33/24G01N33/246G01N33/245
Inventor 王康李立龙凡余翠张原
Owner WUHAN UNIV