铬污染场迁移特性及不同装置探测反演效果分析OA

To ascertain the contamination range and degree caused by the migration of the chromium contamination field,this study con-structed a net reserve-based model for chromium contamination sources in water-rich soils of a permeable layer with high permeability coefficients.Based on the COMSOL software,the migration patterns of the heavy metal contaminant—chromium over time were numer-ically simulated.Targeting the migration model of the chromium contamination field in different periods,the Wenner,dipole-dipole,and pole-dipole arrays were used for detection,respectively.Through multi-constraint joint inversion of resistivity and polarizability,this study comparatively analyzed the resistivity and polarization imaging effects of different detection arrays.The inversion results show that under noise-free voltage conditions,the detection depths of these detection arrays decreased in the order of pole-dipole,dipole-dipole,and Wenner arrays.The Wenner array yielded better resistivity imaging effects relative to polarization imaging.The dipole-dipole array is suitable for detecting the shallow,small-scale contamination field featuring a complex morphology.The pole-dipole array outper-formed others in shallow detection.With a mean disturbance voltage of 7 mV applied,the anti-noise performance of the detection arrays showed descending order of Wenner,dipole-dipole,and pole-dipole arrays,with the apparent polarizability consistently affected less than the apparent resistivity.