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Device and method for measuring moisture characteristic curve in soil dehumidification and moisture absorption processes

A characteristic curve and soil technology, which is applied in the direction of measuring devices, weighing and analyzing materials by removing certain components, can solve the problem of not being able to measure the moisture characteristic curve of the soil moisture absorption process, etc.

Active Publication Date: 2018-07-17
CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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  • Abstract
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Problems solved by technology

[0005] The existing ku-pf unsaturated hydraulic conductivity measurement system can only measure the moisture characteristic curve of the soil dehumidification process, but cannot measure the moisture characteristic curve of the soil moisture absorption process

Method used

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  • Device and method for measuring moisture characteristic curve in soil dehumidification and moisture absorption processes
  • Device and method for measuring moisture characteristic curve in soil dehumidification and moisture absorption processes
  • Device and method for measuring moisture characteristic curve in soil dehumidification and moisture absorption processes

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Embodiment Construction

[0051] In order to make the technical solutions and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0052] An embodiment of the present invention provides a device for measuring the moisture characteristic curve of the soil dehumidification and moisture absorption process, including a ring knife 1, two tensiometers 2, a measuring instrument 3, a clay plate 4 and a first vessel 5, wherein,

[0053] The side wall of ring knife 1 is provided with two openings (not shown with reference numeral among the figure, is positioned at tensiometer 2 places), and two openings are positioned at the different heights of the side wall of ring knife 1, and ring knife 1 configured to be nested outside the soil to be measured;

[0054] The two tensiometers 2 are configured to be respectively adapted to be inserted into the soil through the two openings and measure the ...

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Abstract

The invention provides a device and a method for measuring a moisture characteristic curve in the soil dehumidification and moisture absorption processes. The device comprises a cutting ring, two tension meters, a measuring instrument, a ceramic plate and a first vessel, wherein two open pores positioned at different heights of the side wall are formed in the side wall of the cutting ring, and thecutting ring sleeves the exterior of soil to be measured; the two tension meters are configured to be applicable for being inserted into soil through the two open pores respectively and measuring thetension of soil; the ceramic plate is placed in the first vessel for supporting the cutting ring; the first vessel is configured to keep water inside the first vessel and the upper end face of the ceramic plate to be at the same height all the time when the moisture characteristic curve in the soil dehumidification and moisture absorption processes is measured; the measuring instrument is configured to measure and record the weight of the cutting ring and the weight of soil corresponding to a plurality of preset moments, or the weight of the cutting ring, the weight of the first vessel, the weight of the ceramic plate and the weight of the soil, and record the displayed numbers of the two tension meters corresponding to the preset moments. The device and the method can be used for measuring the moisture characteristic curve corresponding to the soil dehumidification and moisture absorption processes.

Description

technical field [0001] The invention relates to the technical field of farmland water conservancy scientific research instruments, in particular to a device and method for measuring moisture characteristic curves of soil dehumidification and moisture absorption processes. Background technique [0002] The soil water suction varies with the soil water content, and the relationship curve is called the soil moisture characteristic curve. The characteristic curve of soil moisture reflects the relationship between the energy and quantity of soil moisture. It is an essential parameter for studying the hydrodynamic properties of soil and has important guiding significance in production practice. For the same soil, even under the same conditions, the moisture characteristic curves measured by the process of soil dehumidification (from wet to dry) and soil moisture absorption (from dry to wet) are different, and this phenomenon is called "hysteresis". ". When studying the soil infi...

Claims

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Application Information

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IPC IPC(8): G01N5/02G01N5/04G01N13/00
CPCG01N5/025G01N5/045G01N13/00
Inventor 张凯白美健李益农史源章少辉何胜男
Owner CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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