Device for simulating pollutant migration and transformation process of purple soil slope farmland

Abstract

The invention discloses a device for simulating a pollutant migration and transformation process of purple soil slope farmland. The device comprises a soil bin, an artificial rainfall device and a slope ground surface incoming flow simulating device, wherein the soil bin is filled with purple soil and placed obliquely; slope ground surface incoming flow is simulated by the slope ground surface incoming flow simulating device in a manner that a peristaltic pump supplies water to an overflow water tank and enables the overflow water tank to overflow; a water conveying pipe of the artificial rainfall device is provided with a plurality of spray heads, and the spray heads are evenly arranged relative to the surface of the soil bin; and a plurality of surface runoff sampling ports and subsurface flow sampling ports are formed in the tail end of the soil bin and side faces of purple soil. According to the device disclosed by the invention, rainfall, slope incoming flow and the coupling of the rainfall and the slope incoming flow can be simulated, the temporal and spatial distribution characteristics of purple soil slope farmland pollutant migration and transformation in multiple hydrological processes are researched through adjusting various factors, and thus, the device is used for disclosing an interaction mechanism between the surface runoff and subsurface flow of the purple soil slope farmland and the pollutant migration and transformation.

Description

technical field [0001] The invention relates to research on the pollution of purple soil slope cultivated land, in particular to a simulation device for the migration and transformation process of pollutants in purple soil slope cultivated land, and belongs to the fields of soil nutrient loss, soil erosion and non-point source pollution control. [0002] Background technique [0003] Purple soil is a valuable agricultural soil resource. About 80% of the total arable land in the Three Gorges Reservoir area is purple soil, and it is dominated by sloping arable land. It is generally believed that pollutants or nutrients in sloping farmland are mainly lost through surface runoff during rainfall, but recent studies have shown that in sloping farmland with underlying surface or impermeable layer, soil runoff is also one of the main ways of soil nutrient loss. Purple soil is developed from purple shale, and has the characteristics of shallow soil layer, large porosity, and weak p...

AI Technical Summary

Problems solved by technology

The soil column leaching device cannot study the flow of soil in the sloping farmland with underlying surface or impermeable layer and the flow of nutrients or pollutants along the slope direction

[0007] Although the indoor artificial rainfall soil tank experiment can study the surface runoff and soil flow in slope farmland, the existing devices and methods are mainly for slope farmland with no underlying surface or permeable underlying surface such as loess and red loam, but for slope farmland with seepage There are few reports on the device and method for the loss of nutrients and pollutants in purple soil slope farmland with extremely weak underlying surface or impermeable layer along with surface runoff and soil inflow.

In addition, the existing related devices and methods basically do not consider the impact of the coupling of on-slope surface inflow and rainfall-runoff on the loss of nutrients and pollutants during rainfall, nor do they involve the study of the two hydrological processes of rainfall and up-slope inflow. The process of the transfer and transformation of nutrients and pollutants in the surface runoff and soil flow of purple soil slope farmland under the coupling effect

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