Method for monitoring unsaturated flow movement, solute migration flux and equivalent parameter of reclaimed water in frozen soil

Abstract

The invention provides a method for monitoring unsaturated flow movement, solute migration flux and equivalent parameter of reclaimed water in frozen soil. The method comprises the following steps: continuously monitoring soil liquid moisture content and temperature of the frozen soil in different depths; performing parallel sampling on different positions and acquiring measured values by determining total moisture content and solute concentration of the frozen soil in different depths and calculating the average values of the total moisture content and solute concentration of the frozen soil in different depths; adopting Euclidean distance for measuring an average difference between the measured values and the average values, removing a sampling point beyond 95% confidence interval under the condition of logarithmic normal distribution and taking the total moisture content and solute concentration values as calculated values; analyzing unsaturated flow movement and solute migration flux of the frozen soil on the basis of full-section balance process iteration; and analyzing equivalent hydraulic conduction degree and equivalent convection concentration in the frozen soil. The method provided by the invention can realize the determination for the solute migration flux and the equivalent parameter thereof in the frozen soil. A brand-new testing method is supplied for researching the correlation theory of the solute migration in the frozen soil.

Description

technical field [0001] The invention constructs an on-site measurement and analysis method for unsaturated water flow movement, solute migration flux, and equivalent parameters in frozen soil, and relates to a method for monitoring unsaturated water flow movement, solute migration flux, and equivalent parameters in frozen soil . Background technique [0002] The two biggest features of the water cycle in cold regions are soil freezing and river freezing, among which the former has an important impact on the evolution of water resources in cold regions. The formation of permafrost changes the water and heat transfer properties of the soil, directly affects the processes of infiltration, evaporation, and soil flow in the water cycle, and also affects microbial activities, carbon and nitrogen cycles and other associated (accompanied) processes of soil water movement. [0003] The water flow movement and thermal movement model in frozen soil (frozen soil water, thermal coupling...

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Problems solved by technology

[0009] The traditional description method of soil solute migration flux based on the convection-dispersion theory is not suitable for frozen soils, because the solubility of solutes in ice is significantly smaller than that in free water during freezing and thawing, and the amount of migration occurs The quality of solutes and the quality of solutes in liquid water are largely affected by soil temperature and have strong uncertainties. The determination of solute flux and equivalent parameters in soil is directly realized, which is useful for understanding solute migration in frozen soil. is extremely important

[0010] As mentioned above, an accurate and complete method for the determination of unsaturated water movement, solute transport flux and equivalent parameters under permafrost conditions has not been established, and it is impossible to monitor unsaturated water flow movement and solute transport flux in permafrost

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