Site pollutant description method and system based on directional smooth constraint inversion

Abstract

The invention discloses a site pollutant description method and system based on directional smooth constraint inversion. The method comprises the following steps: acquiring resistivity difference interface information on a structural boundary of a polluted site according to drilling data and geological survey data of the polluted site; constructing a grey-scale map according to the resistivity difference interface information; quantizing the grey-scale map into a plurality of local grey-scale maps; calculating structure tensors of the plurality of local grey-scale maps, and calculating diffusion tensors and similarities according to the structure tensors; determining a final resistivity difference interface for the resistivity difference interface according to the similarity; calculating smooth weight coefficients of the final resistivity difference interface in four directions according to the diffusion tensor; constructing a four-direction weighted smooth matrix according to the smooth weight coefficients in the four directions, and substituting the four-direction weighted smooth matrix into an inversion algorithm to obtain an inversion resistivity prediction model; and determining a site pollutant distribution range according to the inversion resistivity prediction model. The method improves the accuracy of resistivity inversion, and enables the determination of the spatial distribution range of pollutants to be more accurate.

Description

technical field [0001] The invention relates to the technical field of site pollutant investigation, in particular to a method and system for describing site pollutants based on directional smooth constraint inversion. Background technique [0002] As environmental problems have become increasingly prominent, site pollution has also become more serious. Since different toxic pollutants are produced in the industrial production process, including heavy metals, pesticides, petroleum hydrocarbons, and solvent-like organic substances, most sites are in a state of combined pollution, which adds great difficulty to the investigation of contaminated sites. The high-density resistivity method is a common site pollutant investigation method, which infers the spatial distribution of underground pollution according to the electrical difference between the pollutant and its surrounding medium. The resistivity inversion method is to iteratively invert the initial geoelectric model on th...

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Problems solved by technology

Therefore, although the above inversion method is fast and efficient, it ignores the influence of structural boundaries in the process of smooth constraints, making it impossible to accurately describe the real stratigraphic structure when performing resistivity inversion on sites with obvious structural interfaces. In addition, the resistivity value of the underground medium obtained by inversion has a large error compared with the real resistivity value, which often leads to wrong inferences when delineating the spatial distribution of pollutants, which greatly troubles the investigation of contaminated sites

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