Method for three-dimensional visualization of colloid motion distribution in unsaturated soil

Abstract

The invention discloses a method for three-dimensional visualization of colloid motion distribution in unsaturated soil. The method comprises the following steps: filling undisturbed soil into a cylindrical transparent container; fully saturating a soil column to ensure no water leakage or water seepage phenomenon; inserting measuring points on the surface of a earth pillar, establishing a measuring circuit, and waiting until the circuit is stable; blending a nano Fe3O4 colloid, pouring the colloid on the surface of the soil column, shaking the colloidal solution before pouring to uniformly distribute nano Fe3O4 particles in the solution, standing after the colloid completely infiltrates into the soil, and ensuring that the Fe3O4 colloid fully infiltrates downwards; reading potential datameasured by equipment, and dividing the data into two parts according to colloid injection time; forward modeling of potential distribution is carried out by using a finite difference method based ona central difference formula; and inverting the conductivity distribution of the network by using BP (Back Propagation) by utilizing a forward result, and carrying out three-dimensional visualizationon an inversion result. The invention is high in operability and clear, reliable soil colloid movement characteristics can be obtained, and a new method is provided for improving the soil pollution treatment efficiency.

Description

technical field [0001] The invention belongs to the technical fields of agricultural technology and environmental ecology, and in particular relates to a method for three-dimensional visualization of colloid motion distribution in unsaturated soil. Background technique [0002] With the change of national strategic goals, environmental issues have received more and more attention in recent years. Compared with air pollution and water pollution, which have received much attention, there are relatively few researches on soil pollution. [0003] Soil pollutants are mainly brought into the soil by human activities. Landfill leakage, atmospheric heavy metal deposition, sewage discharge, agricultural production, industrial manufacturing and other activities will eventually carry pollutants into the soil in the form of sewage, while the waste water Some pollutants exist in the form of colloids, and during the movement, the colloids will absorb heavy metals, organic pesticides, orga...

AI Technical Summary

Problems solved by technology

[0004] The development of electrical prospecting has a long history and is now widely used in geological prospecting engineering. The principle is to solve related problems by studying and summarizing the general distribution of electromagnetic fields in natural electric fields or artificial electric fields in terms of time and space. Applied to large-scale research, it is impossible to conduct research in a laboratory environment, and the cost and cycle of the experiment are relatively large

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