Application of radiomagnetiotelluric method case study


Investigations of the landfill of industrial wastes by the RMT method
The test site is the landfill of the coal ashes from power plants. The landfill was closed about 5 years ago. Material of the landfill is represented by powder-like particles and granules with the cross sizes from several millimeters up to the first centimeters. Wastes fill in a V-shaped valley of a stream (Fig. 1). The top layer is leveled (difference of altitudes is about 2 m and surface is very smooth) and covered with ground. The landfill is limited by abrupt enough slopes of the valley.

Results. Signals of 26 radio transmitters from 16.4 to 933.99 kHz were measured during the field works. After RMT data processing it was found that the landfill is distinguished very good from host rocks. Values of apparent resistivity vary from 40 to 150 Ohm*m, whereas the average value of the host rocks is about 1000 Ohm*m. According to results of interpretation the thickness of the landfill material increases from 0 m in southern part to 30 and more meters in northern part.
In Fig. 2 are presented apparent resistivity data for several frequencies. We can see a good correlation of the landfill’s boundary with apparent resistivity distribution at the area.

In Fig. 3 are shown results of the interpretation of RMT data collected at this territory (plans of isolines for several depths). Behavior of isolines of resistivity has good correlation with the landfill’s contour. The main amount of ashes is localized in the depth interval up to 14 m. The deep conductive zone at the northern part of the landfill is located in the interval 14-22 m.

Cross section obtained as result of 2D inversion of RMT data for the profile 1 is shown in Fig. 4 Ashes are characterized by resistivity of 20-100 Ohm*m, and host rocks – more then 1000 Ohm*m. The most conductive parts of ashes have resistivity about 20-40 Ohm*m.

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