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Two-dimensional soil moisture motion parameter estimation method under ponding infiltration condition

A soil moisture and motion parameter technology, applied in the field of agricultural irrigation, can solve the problems of labor-intensive, time-consuming experiment, complicated parameter estimation method, etc., and achieve the effect of simple and effective determination.

Active Publication Date: 2021-03-05
XIAN UNIV OF TECH
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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for estimating two-dimensional soil moisture movement parameters under the condition of ponding water infiltration, which solves the complexity of parameter estimation methods in the prior art, and the problems of time-consuming, manpower and material resources for a large number of tests

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  • Two-dimensional soil moisture motion parameter estimation method under ponding infiltration condition
  • Two-dimensional soil moisture motion parameter estimation method under ponding infiltration condition
  • Two-dimensional soil moisture motion parameter estimation method under ponding infiltration condition

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Embodiment

[0042] As shown in Table 1, the comparison result of the actual soil moisture movement parameter α and the α obtained by the parameter estimation expression and its relative error estimation, the relative error expression is where X i is the estimated value of parameter α, x i is the value of the alpha parameter provided by the Hydrus-3D software.

[0043] Table 1

[0044]

[0045]

[0046] The relative error analysis shows that the relative error of parameter α of all soils is not more than 15%, so the parameter α can be well estimated by this parameter estimation expression.

[0047] As shown in Table 2, the n values ​​of the soil moisture movement parameters provided by the Hydrus-3D software and the parameter estimation expressions of the nine kinds of soils The comparison results of the obtained n values ​​and their relative error estimates.

[0048] Table 2

[0049]

[0050] Through relative error analysis, the relative errors of 9 kinds of soils are all ...

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Abstract

The invention discloses a method for estimating a two-dimensional soil moisture motion parameter under a ponding infiltration condition. The method comprises a step of estimating soil moisture motionparameters alpha, n and Ks, wherein alpha is a parameter related to air intake suction hd, n is a shape parameter, and Ks is saturated water conductivity, specifically, the estimation is performed according to a formula shown in the specification, k is a proportionality coefficient of the horizontal wetting front distance xf and the vertical wetting front distance zf; N is a shape coefficient; [theta]s is the saturated water content, [theta]r represents the retention water content, hd is the air inlet suction force, n is the shape parameter, and A3 is the power function coefficient of the fitting expression of the horizontal wetting sharp distance xf and the time t. According to the invention, the problems of complexity of a parameter estimation method, time consumption of a large number of tests and consumption of manpower and material resources in the prior art are solved.

Description

technical field [0001] The invention belongs to the technical field of agricultural irrigation and relates to a method for estimating two-dimensional soil water movement parameters under the condition of accumulated water infiltration. Background technique [0002] The soil moisture movement parameters are closely related to the soil moisture movement process, and their accurate description is the key to the simulation of the hydrological process in the watershed, and can also provide important references for farmland irrigation and ecological environment construction. At present, people often use tensiometers, centrifuges, sand core funnels and other physical experimental devices to measure the soil moisture characteristic curve, and then fit the measured data to determine the water movement parameters, or based on the soil moisture characteristic curve or water content. Establishing a parameter mathematical model and using mathematical algorithms such as genetic algorithm ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20G06F30/28G01N33/24G06F113/08G06F119/14
CPCG06F30/20G06F30/28G01N33/24G06F2113/08G06F2119/14G01N33/245
Inventor 苏李君郝卫艳周蓓蓓单鱼洋
Owner XIAN UNIV OF TECH
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