Integration of satellite imagery and geoelectric methods in the diagnosis of chemical pollution of the geological environment

Abstract

Introduction: The work is devoted to the assessment of chemical pollution of the geological environment based on the combined use of satellite imagery and geo-electrical methods. Methodology: A set of methods has been developed, consisting of multi-zone satellite imagery (images of the Sentinel-2 satellites) and geoelectric studies (resistivity of surface waters, survey of the potential of the natural electric field, vertical electrical sounding by the method of resistance). The following indicators of pollution were used: vegetation indices and electrical resistivity of surface waters and components of the geological environment (soils, groundwaters, rocks). Results and Discussion: In the zone of influence of the sulfur warehouse, technogenic modifications of geosystems were identified, differing in the value of vegetation indices (TM-1, TM-2 and the background geosystem); according to the impact gradient, the NDVI value changes by 2‒2.3 times, the NBR value by 2.3‒3.2 times, the SWVI value by 4‒21.4 times; mineralization of surface waters varies from 0.3‒1.1 to 3.5‒10 g/dm3 ; the assessment of chemical pollution of the upper part of the geological environment was carried out, the direction of movement of pollution from the source, the area and depth of pollution were determined; According to vertical electrical sounding data, in the TM-1 zone, pollution has penetrated to a depth of 20 m.