Method for obtaining Van Genchten model parameters of soil moisture characteristic curve

A technology of model parameters and characteristic curves, applied in special data processing applications, soil material testing, electrical digital data processing, etc., can solve the problems of expensive measuring instruments and long measuring cycles, and achieve the effect of shortening the experimental time.

Inactive Publication Date: 2014-12-03
TARIM UNIV
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  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of obtaining the soil moisture characteristic curve van Genuchten equation by the method of actual measurement, which has

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  • Method for obtaining Van Genchten model parameters of soil moisture characteristic curve
  • Method for obtaining Van Genchten model parameters of soil moisture characteristic curve
  • Method for obtaining Van Genchten model parameters of soil moisture characteristic curve

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specific Embodiment approach 1

[0021] Specific implementation mode one: the following combination figure 1 Illustrate the present embodiment, the method for obtaining the soil moisture characteristic curve Van Genchten model parameter described in the present embodiment, the method may further comprise the steps:

[0022] Step 1, pass the air-dried soil sample through a 2mm sieve, and divide it into five parts;

[0023] Step 2. Use the first soil sample to measure field water holding capacity θ fc ;

[0024] Step 3. Use the second soil sample to measure the capillary water holding capacity θ mc ;

[0025] Step 4. Use the third soil sample to measure the soil water suction h corresponding to the capillary water holding capacity of the soil mc ;

[0026] Step 5. Use the fourth soil sample to measure the residual water content θ r ;

[0027] Step 6. Use the fifth soil sample to measure the soil water suction h corresponding to the field water holding capacity fc ;

[0028] Step 7. According to the par...

specific Embodiment approach 2

[0053] Specific embodiment two: present embodiment provides a specific embodiment, and soil sample adopts sandy soil, and the basic data that application method of the present invention measures is as table 2, obtains the parameter α, m, n of soil moisture characteristic curve van Genuchten model as table 3.

[0054] Table 2 The data measured by the method of the present invention

[0055] θ mc (cm 3 cm -3 )

[0056] Table 3 Parameters α, m, n of van Genuchten model of soil moisture characteristic curve

[0057]

[0058] The error of the parameters measured by the method of the invention and the traditional actual measurement method is very small, the relative error of the parameter α is 1.61%, the relative error of the parameter n is 0.97%, and the relative error of the parameter m is 0.77%.

specific Embodiment approach 3

[0059] Specific embodiment three: present embodiment provides a specific embodiment, and soil sample adopts loam, application method of the present invention measures basic data as table 4, obtains the parameter α, m, n of soil moisture characteristic curve van Genuchten model as table 5.

[0060] Table 4 The data measured by the method of the present invention

[0061] θ mc (cm 3 cm -3 )

[0062] Table 5 Parameters α, m, n of van Genuchten model of soil moisture characteristic curve

[0063]

[0064] The parameter errors measured by the method of the invention and the traditional actual measurement method are very small, the relative error of the parameter α is 1.37%, the relative error of the parameter n is 0.91%, and the relative error of the parameter m is 1.06%.

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Abstract

The invention relates to model parameter solution methods, particularly to a method for obtaining Van Genchten model parameters of a soil moisture characteristic curve. The method aims at solving the problems that measuring instruments are expensive and the measurement period is long when a soil moisture characteristic curve Van Genchten equation is obtained by an actual measurement method. The method comprises the following steps of sieving a dried soil sample through a 2mm sieve and dividing the dried soil sample into five equal parts; measuring the field moisture capacity theta fc, the capillary moisture capacity theta mc, the soil moisture suction hmc which is corresponding to the soil capillary moisture capacity, the residual moisture content theta r and the soil moisture suction hfc which is corresponding to the field moisture capacity through the five equal parts respectively; obtaining the parameter m according to the formula; obtaining the parameter alpha according to the formula; obtaining the parameter n according to the formula to achieve the obtaining of the Van Genchten model parameters.

Description

technical field [0001] The invention relates to a method for solving model parameters and belongs to the field of soil characteristic research. Background technique [0002] The soil water matrix potential or soil water suction varies with the soil water content, and its relationship curve is called the soil moisture characteristic curve. The abscissa indicates the soil water matrix potential or soil water suction, and the ordinate indicates the soil water content. The characteristic curve of soil moisture reflects the relationship between the energy and quantity of soil water. It is involved in the study of soil moisture retention and movement and reflects the basic properties of soil moisture. It has important practical value. First of all, the soil moisture characteristic curve can be used to convert between soil matric potential or soil water suction and water content, so it can reflect the amount of water that soil can hold or release in different ranges of matric poten...

Claims

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Application Information

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IPC IPC(8): G06F19/00G01N33/24
Inventor 迟春明
Owner TARIM UNIV
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