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Geomative - Resistivity Meter
The survey of environmental pollution sites, led by geophysical methods and regarding ERT electrical methods as the core, investigates the pollution status of typical pollution sources with the help of electromagnetic method and Ground Penetrating Radar. According to the physical and chemical differences between the pollutants and the surrounding media, the distribution of the physical sites is measured, and the distribution and migration of pollutants are deduced. The rapid, low-cost, non-destructive and systematic site survey techniques will provide a reliable basis for comprehensive site remediation and development in the future.
Scope of survey:
- Environmental pollution site survey
- Heavy metals, organic matters toxic substances
- Geological exploration and geological hazard survey
- Water exploration, mineral exploration, landslides, urban road collapse
Survey equipment:
Resistivity imaging instruments GD-10 Resistivity and IP Imaging System / GD-20 Resistivity and IP Imaging System to guarantee efficiency and accuracy.
Co-use of rapid-detection instruments and equipment to ensure targeted and representative survey.;
Case 1: Geophysical Instrument for Petrol Station Oil Leakage Survey
Objective: Delineate the leakage areas
Technical methods: GPR and ERT resistivity
Analysis and interpretation of survey results
Result maps of the GPR method with GPR-1 and result maps of the ground resistance image profiling method with ERT-1 (as shown below) indicate the same suspected leakage area]
Analysis and interpretation of survey results:
Inductive electromagnetic method: According to the survey results, in the result map, the red scale suggests high conductivity (low resistivity) and the blue-violet scale suggests low conductivity (high resistivity). It is assessed that the landfill in this area has been mixed with much leachate, resulting in a relatively high conductivity, and that the highly conductive area is associated with a large gathering of landfill leachate and may have formed underground channels for the landfill leachate. It is inferred from the analysis that the groundwater in the southwestern part of the site and the surrounding farmland may have been affected by the pollution of landfill leachate.
According to the result maps of the ERT resistivity method, it is speculated that the overall shallow strata is of low resistivity. At the same time, after analyzing the 3D distribution of low resistivity below 50 Ohm-m-80 Ohm-m, the results basically coincide with those of the inductive electromagnetic method, i.e., the heavy metal contaminated soils, large-scaled and deep, are mainly distributed in the west of the site. The 3D results show that the resistance is featured by downward extension; the average depth is analyzed as 1.2 to 1.8m and some low resistance even reaches 2.2 to 2.5m in depth. It is estimated that the heavy metal pollution in the west of the site reaches a deep degree of depth.