Device for soil water, vapor, heat and salt coupled migration test of unsaturated zone

Abstract

The invention discloses a device for a soil water, vapor, heat and salt coupled migration test of an unsaturated zone. The device comprises a soil pillar unit, an evaporation unit, a water supply unitand a monitoring unit, wherein the soil pillar unit comprises a soil pillar with an opening at the upper end, and the outer side wall of the soil pillar is wrapped with thermal insulation sponge. Themonitoring unit comprises a monitoring system and a data acquisition system, the monitoring system comprises multiple soil water-temperature-conductivity sensors and soil temperature sensors insertedinto the soil pillar, and the monitoring system is connected with the data acquisition system. The evaporation unit comprises a radiation lamp suspended above the soil pillar. The water supply unit comprises a water supply device mounted on a support frame through a lifting system, and the water supply device is communicated with the soil pillar and a peristaltic pump. The device can convenientlyand continuously monitor the water, temperature and conductivity of the unsaturated zone to obtain the migration condition of liquid water, water vapor, hot flows and salt in the unsaturated zone andprovides necessary information for study on the migration distribution law of water, heat and salt in the unsaturated zone.

Description

technical field [0001] The invention belongs to the field of groundwater environmental engineering, and in particular relates to a device for coupled migration tests of soil water, steam, heat and salt in an unsaturated zone. Background technique [0002] The migration and transformation between matter and energy in soil in nature is very common. Water movement, heat conversion and solute transport at any point in unsaturated soil are interrelated and interact, thus forming a complex soil hydrodynamic coupling system. Therefore, the research on the coupled transport mechanism of soil water, heat and solutes in this system has important guiding significance for agricultural production, engineering construction, salinization land treatment, monitoring and control of groundwater pollution, etc. [0003] To this end, the migration and distribution information of soil water, heat and salt is obtained indirectly by observing the soil moisture content, temperature and electrical c...

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Problems solved by technology

Although there are experimental devices used for similar research at home and abroad, there are still the following defects: 1. The soil column itself has not been adiabatized, resulting in heat exchange between the soil column and the external environment during the test and cannot form a one-dimensional soil column experiment. 2. Many indoor experiments are carried out in closed soil columns without considering the entry of external moisture and the evaporation of soil moisture at the upper boundary, resulting in failure to consider evaporation and the soil-atmosphere interface Boundary influence

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