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Novel method for detecting soil water absorption curve by utilizing atomization principle and determination device

A measuring device and technology of water absorption curve, applied in the field of soil water movement research, can solve the problems of local instantaneous saturated water flow easily occurring in soil water absorption, limited range for measuring soil water potential, and few methods for measuring soil water absorption curve, etc., achieving high precision and easy realization. , the effect of high measurement accuracy

Inactive Publication Date: 2009-05-06
INST OF GEOGRAPHICAL SCI & NATURAL RESOURCE RES CAS
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Problems solved by technology

[0009] The object of the present invention is to solve the problems of existing soil water absorption curves with few measuring methods, limited range of measuring soil water potential, local instantaneous saturated water flow easily occurring in soil water absorption, etc., and provide a complete measuring method of soil moisture characteristic curve considering hysteresis effect and device

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  • Novel method for detecting soil water absorption curve by utilizing atomization principle and determination device
  • Novel method for detecting soil water absorption curve by utilizing atomization principle and determination device
  • Novel method for detecting soil water absorption curve by utilizing atomization principle and determination device

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Embodiment Construction

[0026] The following will be combined with figure 1 Further illustrate the present invention to measure the operation process of soil water absorption curve:

[0027] 1. Load the soil sample 5 to be tested (specification Φ60mm×10mm) with a ring knife, weigh it and record it, put it into the pressure device 1, cover the pot, and tighten it with screws to ensure the tightness of the pot;

[0028] 2. Start the pressure device, pressurize to the maximum pressure (pressure range 0.1MPa ~ 1.5MPa), so that the water is discharged from the soil sample, passes through the clay porous plate 4, and is discharged from the drainage conduit 9. When the balance is reached, the soil water content reaches the minimum value .

[0029] 3. Turn on the pressure device, quickly take out the soil sample and weigh it, and calculate the weight reduction value of the soil sample to obtain the soil water content θ corresponding to the pressure P;

[0030] 5. Fasten the uniform humidifying device 3 to ...

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Abstract

The invention relates to a brand-new method and a measuring device for a soil moisture characteristic curve, which can measure the moisture characteristic curve in a soil moisture absorption process. The method utilizes a water pulverization theory to generate a humidification condition through uniform water vapor so as to measure parameters (numerical values of pressure and water content) in the soil moisture absorption process. The measuring device comprises a pressure device, an ultrasonic atomizer and a uniform humidifying device, wherein the pressure device is used for quantitatively controlling and measuring the pressure variance of a soil moisture absorption curve process, namely soil water potential variance; the ultrasonic atomizer is used for generating ultramicro water particles of 1 micrometer to 5 micrometers, and the uniform humidifying device realizes the uniform moisture absorption of test soil samples under a set pressure condition and can ensure that no partial saturated soil water flow phenomenon can occur in the moisture absorption process. The invention provides necessary scientific bases for researching soil water moving characteristics and tri-water transformational relation in a water circulating process, agricultural scientific irrigation and crop growth.

Description

technical field [0001] The invention belongs to the field of soil water movement research, and relates to a method for measuring soil water characteristic curves, in particular to a new method for measuring soil water characteristic curves in the process of soil moisture absorption and a measuring device thereof. Background technique [0002] Soil matric potential (suction) varies with soil moisture content. The soil water characteristic curve shows the relationship between the energy state of soil water and the soil water content in the unsaturated state. Through the water characteristic curve, the soil water content and the matrix potential can be converted to each other, and the distribution and ratio of the equivalent pore size in the soil can be calculated. Water capacity plays an important role in understanding the basic characteristics of soil and studying soil water retention and movement. [0003] However, many experiments have shown that for the same soil, the wat...

Claims

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Application Information

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IPC IPC(8): G01N5/02
Inventor 娄华君庄健鸿
Owner INST OF GEOGRAPHICAL SCI & NATURAL RESOURCE RES CAS
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