Method and device for determining turbulent kinetic coefficients of unsaturated soil

A technology of mechanical coefficients and measurement methods, applied in measuring devices, soil material testing, scientific instruments, etc., can solve problems such as the reduction of parameter applicability, and achieve the effect of accurate mechanism

Inactive Publication Date: 2017-09-15
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

Method used

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  • Method and device for determining turbulent kinetic coefficients of unsaturated soil
  • Method and device for determining turbulent kinetic coefficients of unsaturated soil
  • Method and device for determining turbulent kinetic coefficients of unsaturated soil

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Embodiment Construction

[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 a device for determining turbulent kinetic coefficients of unsaturated soil. The method comprises the following steps: conducting filling of soil samples; arranging monitoring sites at regular intervals, arranging a soil matric potential monitoring system and a soil tracing solute concentration monitoring system at each monitoring site for continuous monitoring of changes in soil water content and changes in tracing solute concentration in soil at each monitoring site; dividing sections, and determining soil matric potential of upper and lower boundaries of each section for determination of the water potential difference and water movement flux of each section; calculating average section water flux at any time t based on the water movement flux of each section; converting soil negative pressure into the soil water content, further coupling the determined average section water flux, and calculating the turbulent kinetic coefficient of solute migration by a formula finally. The method has the advantages that a mathematical model is built, operation is facilitated, measurement precision is high, an experimental model is easy to build, conditions are easy to realize, the samples are rich and varied, and results are visual.

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...

Claims

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Application Information

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IPC IPC(8): G01N33/24
CPCG01N33/24G01N33/246G01N2033/245
Inventor 王康李立龙凡余翠张原
Owner WUHAN UNIV
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