Porous medium moisture and solute transport test apparatus and experiment method

Abstract

Porous medium moisture and solute transport test apparatus and experiment method belong to the field of soil physics researching. The test apparatus includes a soil pillar, a plurality of moisture measuring apparatuses, a plurality of penetrating fluid collection apparatuses, a liquid supply apparatus, a buffer apparatus, a base plate, a concentration measuring apparatus, and a data processing system; wherein the soil pillar is arranged horizontally and is filled with a porous medium. A plurality of measuring holes are formed in the upper side wall of the soil pillar while a plurality of collection holes are formed in the lower side wall of same, the measuring holes and the collection holes being staggered; each moisture measuring apparatus is installed in each measuring hole while each penetrating fluid collection apparatus is installed in each collection hole; one end of the soil pillar is connected with the buffer apparatus and the other end of same is connected with the base plate;a liquid inlet of the buffer apparatus is connected to the liquid outlet of the liquid supply apparatus; each moisture measuring apparatus has a soil moisture sensor, of which a probe is inserted inthe porous medium via the measuring hole; the concentration measuring apparatus is used for measuring the electrical conductivity of the penetrating fluid collected by the penetrating fluid collectionapparatuses.

Description

technical field [0001] The invention relates to the field of soil physics research, in particular to a porous medium moisture and solute migration test device and test method. Background technique [0002] With the development of modern agriculture and the continuous improvement of the level of science and technology, the prevention of chemical products such as pesticides and enterprise waste water from polluting soil and groundwater, as well as the diffusion of soil pollutants and the reduction of soil productivity due to the migration of soil solutes with soil water runoff, have been subject to widespread concern around the world. As the carrier of solute, water in porous media plays an extremely important role in the migration process of pollutants in porous media. Therefore, revealing the characteristics of water movement in porous media is the basis for controlling the diffusion of pollutants. [0003] At present, a lot of research work has been done on the measuremen...

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Problems solved by technology

The vertical soil column method cannot eliminate the effect of gravity and is suitable for situations where the infiltration time is not very long

The method of calculating the moisture characteristic curve of porous media calculates the hydraulic parameters and solute migration parameters of the porous media based on the measured moisture or solute characteristic curves of the porous media.

The traditional horizontal soil column can eliminate the influence of gravity and horizontal pressure, and the calculation method is simple. However, due to the limitation of conditions, the traditional horizontal soil column is greatly affected by the effect of the bottom and side walls, and cannot fully simulate the diffusion process in the semi-infinite horizontal soil. Assumptions for Column Diffusion

Therefore, the water content and solute migration parameters obtained by the traditional horizontal soil column method still have large errors.

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