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On behalf of the client, our company is primarily responsible for the overall geophysical survey work of this plot (hereinafter referred to as the "survey area"). The main purpose of this is to investigate the distribution of underground electrical resistivity in this plot and to infer the direction of underground water flow.
The survey area is a certain leachate treatment plant. This project aims to conduct an investigation of the leachate plant of xx environmental park using geophysical methods, such as the high-density electrical method (ERT). The goal is to select low-cost, efficient and simple geophysical methods to obtain detection data, thereby providing a reliable basis for identifying the direction of groundwater flow.
High-density electrical method (ERT)
一、 Presentation of High-Density Electromagnetic (ERT) Results
The survey line was laid out from west to east, located in the southern part of the survey area. This area is a green belt with a high clay content. Based on the inversion results of the high-density electrical resistivity, the geological data of the survey area, and the surface grounding conditions, a comprehensive factor analysis was conducted.
From the inversion result graph of the data, the resistivity of the survey line is divided into two layers. The resistivity is higher in the depth range of 0-3m, which is greater than 40Ω·m, and is presumed to be miscellaneous fill soil; at the mileage range of 20-58m and the depth range of 3-13m, there is an abnormal low-resistance area with a resistivity of 0-30Ω·m, which is presumed to be a groundwater channel.
The survey line was laid out from west to east, located in the southern part of the survey area. This area is a green belt with a high clay content. Based on the inversion results of the high-density electrical resistivity, the geological data of the survey area, and the surface grounding conditions, a comprehensive factor analysis was conducted.
From the inversion result graph of the data, the resistivity of the survey line is divided into two layers. The resistivity is higher in the depth range of 0-2m, which is greater than 40Ω·m, and is presumed to be miscellaneous fill soil; at the mileage range of 22-39m and the depth range of 3-17m, there is an abnormal low-resistance area, with a resistivity of 0-40Ω·m, which is presumed to be a groundwater channel; at the mileage range of 40-74m and the depth range of 2-8m, there is another abnormal low-resistance area, with a resistivity of 0-30Ω·m, which is presumed to be a groundwater channel.
Conclusion: The understanding of the results of this geophysical survey is based on the current known geological data and the obtained geophysical information. As the research on the work area continues to deepen, the interpretation results may be further verified or corrected. Due to the multi-solution nature of the geophysical inversion results and the influence of natural and human factors, three abnormal areas were inferred based on the existing results. It is recommended to verify these abnormal areas in the later stage.