Study on pollutant model construction and three-dimensional spatial interpolation in soil environmental survey

In site soil investigation, the construction of three-dimensional (3D)geological model and spatial three-dimensional distribution model of pollutants can help investigators to clearly and intuitively understand the morphology distribution and spatial relationship of pollutants. Four 3D interpolation methods (Krige, IDW-Shepard, FastRBF and Nearest Neighbor)are compared and studied, based on the Sb (antimony) data in soil of a polluted plot in Tianjin by using EVS-Pro. The results show that the selection of interpolation method is quite different for the calculation results of 3D interpolation model, and the cross-verification results show that the interpolation accuracy of Krig-3D interpolation model is the highest. The pollution distribution model of Sb based on interpolation results can truly reflect the actual pollution of the site and accurately help to calculate earthwork, and 3D model and visualization technology have more intuitionistic and clear display. It provides a reference and framework for the subsequent remediation and treatment of contaminated sites.