Method and device for determining turbulent kinetic coefficients of unsaturated soil

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...

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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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