A method and device for dynamically measuring soil porosity

Abstract

The invention provides a method and device for dynamically measuring soil porosity. A closed-loop gas path is utilized for measuring the change rule of radon concentration in the device, the changes of the radon concentration in the device at different measuring volumes are obtained by changing the volume of the measuring device, and the soil porosity can be calculated. The effective decay constant of radon is considered when the change rule of the radon concentration in the measuring device is measured and comprises the decay constant, the leakage coefficient and the inverse diffusion coefficient of radon, the accurate soil porosity eta can be calculated, and the measuring precision is high. According to the method and device, the values of n measuring periods in the measuring device aresubjected to nonlinear fitting, it is not needed that the radon concentration in the device is stable, the measuring time is saved, the sampling measuring process and the calculating method are simple, the measuring difficulty is reduced, and the measuring cost is reduced.

Description

technical field [0001] The invention relates to a radiation detection technology, in particular to a method and device for dynamically measuring soil porosity. Background technique [0002] Soil porosity is the ratio of the volume of pores between soil particles to the total volume of soil. Soil porosity is an important index reflecting soil properties. In the prior art, there are empirical calculation method, mercury intrusion method, soil bulk density and specific gravity calculation method, image processing method and volume difference calculation method to measure soil porosity, but all of them have certain limitations, and the measurement accuracy is not high. The obtained data has large errors and complex operations. [0003] The empirical calculation method is converted from other soil indicators (natural weight, water content, relative density of soil particles, water weight), most of the indicators (natural weight, water content, relative density of soil particles...

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Problems solved by technology

In addition, determining the soil particle density of different soil textures is labor-intensive and time-consuming. Usually, the bulk density of the quartz sand sample is used as a typical reference value, which virtually increases the error of the measurement data.

[0004] Patent document CN107741391A discloses a method for measuring soil porosity, which uses the relationship between resistivity and soil porosity to obtain soil porosity by measuring soil resistivity. This method does not need to destroy the original soil during the sampling measurement process. With structure, the original density, water content and other elements of the soil can be preserved to the greatest extent, but this method still has complex calculations. It is necessary to establish a relationship model between soil porosity and soil resistivity, and the model is a rough estimation model. Introduced errors, affecting the calculation accuracy

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