Method for Determination of Diffusion Coefficient of Solute Transport in Field with Flux Conservation in the Whole Process

Abstract

The invention discloses a method for measuring the diffusion coefficient of on-site soil solute migration with flux conservation in the whole process. First, identify the groundwater flow field to determine the main and secondary migration directions of solutes in groundwater in the soil; then, based on the flux conservation of solutes, establish a mathematical model for simulating soil solute movement; determine the field experimental conditions for the mathematical model; Under boundary conditions, non-converted solutes were injected in the form of injection sources, and the radial flow observation method was used to measure the concentration of non-converted solutes in the main and secondary migration directions with time; the relationship between the diffusion coefficient and the average pore flow velocity The relationship diagram and the influence of soil and pore average velocity on the diffusion coefficient are analyzed, and the diffusion coefficient is determined based on the flux conservation of the whole process of the non-transformed solute. The invention establishes a mathematical model, simulates the movement of soil solute, is easy to operate, has high measurement accuracy, is easy to build an experimental model, is easy to realize conditions, has rich and diverse samples, and has intuitive results.

Description

technical field [0001] The invention relates to the field of water environment protection, in particular to a method for measuring the diffusion coefficient of on-site soil solute migration with flux conservation in the whole process. Background technique [0002] At present, the pollution of groundwater quality, such as the research on the prediction and evaluation of the impact of sewage discharge or high-concentration recharge water on groundwater quality, is very important for controlling or preventing the occurrence of groundwater pollution. The mathematical model of water quality is very important for the prediction and evaluation of groundwater quality, and the groundwater diffusion coefficient is an important and indispensable parameter to establish this model. The groundwater diffusion coefficient is a parameter that characterizes the migration and propagation of solute pollutants in groundwater. [0003] The determination of the dispersion coefficient is inseparab...

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Problems solved by technology

At present, most methods have not yet formed a recognized and mature specification. The assumptions are idealized, and the obtained parameters are difficult to reflect the actual situation.

[0004] As mentioned above, a complete set of hydrodynamic diffusion coefficient measurement methods has not yet been standardized, which cannot provide a scientific basis for formulating reasonable and effective groundwater pollution prevention and control measures, controlling the development of pollution, improving groundwater quality and environment, and choosing the best treatment plan

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