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Method for measuring and calculating soil wetting front suction

A soil moistening and suction technology, applied in the field of soil physics, can solve problems such as lengthy calculation process, variation and complexity of soil volume moisture content, achieve the effects of improving calculation efficiency, saving measurement time and corresponding equipment investment, and reducing measurement links

Inactive Publication Date: 2012-01-11
LUDONG UNIVERSITY
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Problems solved by technology

[0008] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art, and provide a method for measuring and calculating the soil wetting frontal suction, which mainly solves the problems that the existing method needs to measure the change of soil volume moisture content before and after infiltration and the calculation process is long and complicated.

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  • Method for measuring and calculating soil wetting front suction
  • Method for measuring and calculating soil wetting front suction
  • Method for measuring and calculating soil wetting front suction

Examples

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Embodiment 1

[0024] Example 1: In the first step, the quantitative relationship between the soil wetting frontal suction parameter Ψ and the corresponding characteristic parameter value of the infiltration time data is measured. Use the Philip-Dunne infiltration method at several test points in the area to be tested, and use the Philip-Dunne infiltration instrument, that is, a transparent plastic straight pipe with a diameter of about 5cm and a length of about 35cm (but longer than 30cm). The Dunne infiltration instrument is inserted at a depth of about 10cm below the soil surface, and the soil in the tube is taken out, and the precipitation head multi-dimensional infiltration experiment is carried out at multiple test points outdoors on the fields that need to measure the soil moisture front suction. The initial water head of the Philip-Dunne infiltrator is kept at 30cm, and the initial value of the soil volume moisture content before and after the experiment is measured by the TDR soil mo...

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Abstract

The invention provides a method for measuring and calculating soil wetting front suction, comprising the step of establishing a quantitative relationship between the soil wetting front suction and infiltration time data characteristic parameters (the deflection, the peakedness and variation coefficient) on the basis of Philip-Dunne infiltration data analysis under the condition of three soil texture conditions of clay, loam and sandy soil. The change of water content of front and rear infiltrated soil is not need to consider and only accumulated infiltration times corresponding to different water levels in a Philip-Dunne infiltration instrument need to be observed when the method is used for measuring and calculating the soil wetting front suction, thereby simplifying the calculation process of the soil wetting front suction and improving the measuring efficiency.

Description

Technical field: [0001] The invention relates to the field of soil physics, in particular to a method for measuring soil wet frontal suction. Background technique: [0002] The wetting front suction Ψ is an important parameter of the Green-Ampt infiltration model, which is used to represent the suction of the dry soil below the wetting front to the moisture in the humid area. In 1911, Green and Ampt proposed a one-dimensional vertical water infiltration model based on the capillary theory. Because the model is simple to calculate and has a certain physical basis, it has been widely used in the study of infiltration problems for a long time. The solution and the cause of the error have been studied and improved in many aspects, so that the Green-Ampt infiltration model has been continuously supplemented and developed. [0003] Soil wetting frontal suction is one of the important physical parameters of soil. It is an important soil parameter for estimating soil unsaturated ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N13/00G01N15/08
Inventor 张振华杨润亚任尚岗潘英华何福红
Owner LUDONG UNIVERSITY
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