Large unsaturated seepage physical simulator for soil in aerated zone

Abstract

The invention provides an unsaturated seepage physical simulator for soil in an aerated zone. The unsaturated seepage physical simulator comprises a tested soil tank, a supplementing and draining system and a measuring system, the tested soil is contained in the tested soil tank, the supplementing and draining system consists of a lateral supplementing and draining unit, a bottom supplementing and draining unit and a top supplementing and draining unit, the lateral supplementing and draining unit consists of a water supplementing device and a water draining device which are respectively mounted on two side walls of the tested soil tank, the top supplementing and draining unit consists of a rainfall device, an evaporation device and an accumulated water infiltration device, and the measuring system comprises a soil solute measuring unit, a soil moisture measuring unit, a soil water potential measuring unit and an underground water level measuring unit. The large unsaturated seepage physical simulator for the soil in the aerated zone not only can sufficiently simulate various conditions of soil in the aerated zone, but also is convenient in measurement and low in errors.

Description

technical field [0001] The invention provides a large-scale vadose zone soil unsaturated seepage physical simulation device, which is mainly used for simulating soil water flow and solute migration process under different replenishment and drainage conditions, and belongs to the field of hydrogeological research. Background technique [0002] The area of ​​arable land in our country is constantly decreasing. In recent years, due to poor irrigation and lack of fresh water, serious secondary salinization of the soil has occurred, threatening the sustainable development of agriculture, and even threatening the food supply of 1.4 billion people in the 21st century. need. Important issues in current agricultural production - washing salt and preventing salt accumulation, regulating soil water and salt to meet the requirements of crops, and maintaining soil nutrients are one of the cores of this issue. To understand this core issue, the study of soil water flow and solute transpo...

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Problems solved by technology

[0003] For example, the indoor one-dimensional soil column developed by predecessors can simulate unsaturated seepage in vadose zone soil and one-dimensional hydrodynamic dispersion, but the instrument can only simulate one-dimensional flow; another example is the groundwater column developed by predecessors. Pollution simulation tank, the device can simulate the solute migration process of multiple aquifers, and can also simulate two-dimensional soil water flow, but its size is too small to completely simulate the actual field situation, and it cannot perform simultaneous online monitoring of multiple parameters

[0004] According to previous studies, the current physical simulation device for unsaturated seepage in vadose zone soil has the following defects: 1. The scale is small, and its side walls have a great influence on the process of soil water flow and solute migration, making the test less representative , it is also difficult to meet the boundary conditions of the model; 2. The seepage field is too small to simulate the complex hydrogeological conditions of the vadose zone, and cannot accurately reflect the real geological conditions in the field; 3. It is impossible to simultaneously measure and analyze multiple parameters. On-line monitoring; 4. Simultaneous research on seepage and solute migration in unsaturated zones cannot be performed simultaneously

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