Method for determining influence range of abnormally high values of sampling points of soil heavy metal content in mining area

Abstract

The invention provides a method for determining the influence range of abnormally high values of sampling points of soil heavy metal content in a mining area, and belongs to the technical field of environmental assessment of a mining area. The method includes the steps of extracting abnormally high value points from various heavy metal content data of each sampling point by using a three-fold standard deviation method, and respectively generating Voronoi diagrams of all sampling points and the abnormally high value points; taking the sampling points having the common Voronoi edges with a Voronoi polygon where the abnormally high value points are located as first-order neighboring points of the corresponding abnormally high value points; determining a dynamic buffer radius of each abnormally high value point according to a heavy metal content attenuation coefficient; and taking the intersection of the abnormally high value point Voronoi diagram and a buffer taken as the influence rangeof the abnormally high value points. The method of the invention retains the influence of the abnormally high value points on the soil heavy metal content in the local area nearby, also avoids the mutual interference between the influence areas of different abnormal high value points, effectively improves the spatial interpolation precision of the soil heavy metal content and more accurately reflects the soil heavy metal pollution near the mining area.

Description

technical field [0001] The invention belongs to the technical field of environmental assessment of mining areas, and in particular relates to a method for determining the influence range of abnormally high values ​​of sampling points of heavy metal content in mining areas, aiming at the accuracy requirements of research on the spatial distribution characteristics of heavy metal content in mining areas. Background technique [0002] In view of the serious harm of heavy metals to human health and their refractory degradation in the natural environment, the treatment of heavy metal pollution in mining areas has always been a research hotspot and difficulty in the field of environmental protection in mining areas at home and abroad. Reasonable and accurate evaluation of the spatial distribution characteristics of heavy metals around the mining area is the basic premise for timely and effective formulation of heavy metal pollution control measures. [0003] Abnormally high-value ...

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Problems solved by technology

[0004] The main purpose of the present invention is to overcome the deficiencies of the prior art, to propose a method for determining the influence range of abnormally high values ​​of sampling points of soil heavy metal content in mining areas, and to strive to more accurately reflect the spatial distribution characteristics of heavy metals in mining area soil and to solve the problem of the accuracy of traditional methods. Low, difficult to truly reflect the heavy metal pollution in the soil near the mining area and other issues

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