Whole-process flux-conservation on-site soil solute transport dispersion coefficient measuring method

Abstract

The invention discloses a whole-process flux-conservation on-site soil solute transport dispersion coefficient measuring method which comprises the following steps: firstly identifying an groundwater flow field, and determining a primary transport direction and a secondary transport direction of motion of a solute in groundwater in soil; then on the basis of flux conservation of the solute, building a mathematical model which simulates the motion of the soil solute; determining the on-site experiment condition of the mathematical model; injecting a non-convertible solute in the form of an injection source under controlled boundary conditions, and measuring the changes of the concentration of the non-convertible solute in the primary transport direction and the secondary transport direction along with time; drawing a relationship diagram of a dispersion coefficient and a mean pore velocity, analyzing the influence of the soil and the mean pore velocity on the dispersion coefficient, and determining the dispersion coefficient on the basis of the whole-process flux conservation of the non-convertible solute. According to the method, the mathematical model is built to simulate the motion of the soil solute, the operation is easy, the measuring accuracy is high, an experiment model is easy to build, conditions are easy to realize, a variety of samples are provided, and results are straightforward.

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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