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Determination method of water diffusivity in unsaturated soil based on completely nonlinear flow process response

A technology of flow process and soil moisture, applied in liquid dispersion analysis, particle and sedimentation analysis, suspension and porous material analysis, etc., to achieve efficient utilization

Active Publication Date: 2020-05-12
WUHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Compared with existing methods, the advanced nature of the present invention lies in that the proposed test mechanism can fully reflect the physical properties of D(θ), and solve the problem of linearizing the nonlinear process of soil unsaturated flow in traditional methods. Major Test Mechanism Issues

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  • Determination method of water diffusivity in unsaturated soil based on completely nonlinear flow process response
  • Determination method of water diffusivity in unsaturated soil based on completely nonlinear flow process response
  • Determination method of water diffusivity in unsaturated soil based on completely nonlinear flow process response

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Embodiment Construction

[0169] In order to facilitate those of ordinary skill in the art to understand and implement the present invention, the present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the implementation examples described here are only used to illustrate and explain the present invention, and are not intended to limit this invention. 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.

[0170]

[0171] This experiment elaborates the scheme of the present invention through two kinds of realization methods, and specific implementation steps are as follows:

[0172] ① Prepare soil samples and fill soil columns, and prepare enough samples (air-dried moisture content). Fill the soil column according to a certain density, ...

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Abstract

The invention discloses an unsaturated soil moisture diffusivity measuring method based on perfect nonlinear flow process response. The method includes the steps: measuring moisture diffusivity in the horizontal infiltration absorption process, and measuring moisture diffusivity in the horizontal penetrating process; measuring total water infiltration amount and water contents at horizontal positions in a horizontal soil column in the infiltration absorption process; drawing a theta-eta relationship curve, and amending the theta-eta relationship curve based on measured values; dividing the theta-eta relationship curve according to a certain theta value, and solving a D (theta) value by a graphic analysis method before boundary effluent is formed; transforming the horizontal infiltration absorption process into the horizontal penetrating process, measuring soil matrix potentials at different positions and right boundary fluxes, and determining a diffusion coefficient after the boundary effluent is formed. The measuring method solves the problem that the testing principle of an existing testing method needs to control approximate linearization of an unsaturated moisture diffusivity D (theta)-theta non-linear relationship and measuring errors, information is clear and visual, and the measuring method has originality in the field.

Description

technical field [0001] The invention relates to the technical field of soil moisture movement research, in particular to a method for measuring the diffusivity of unsaturated soil moisture. Background technique [0002] With the progress of society and the rapid development of economy, the contradictions and problems related to water resources are becoming more and more acute, which further increases the pressure of water shortage in the sustainable development of economy and society. How to maintain the sustainable development of agriculture and the effective use of water resources rate has become an urgent problem to be solved. The study of soil moisture movement and comprehensive utilization has become an important topic in social development. Soil water movement is a complex process, which is closely related to many factors such as irrigation methods, soil conditions and external environment. Soil moisture diffusivity is an important parameter of the soil moisture moti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/08
CPCG01N15/082G01N2015/0034
Inventor 王康李立张梦颖余翠龙凡
Owner WUHAN UNIV
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