Ground penetrating radar is a general term to describe methods that use radio waves to probe subsurface objects or geologic features, it is a non- invasive electromagnetic geophysical technique for subsurface exploration and characterization. In a manner akin to radar principles, GPR system transmit impules of electromagnetic energy(radio wave) into the ground and detect their corresponding echoes reflected from interfaces of varying electromagnetic properties beneath the surface. The application of GPR technology for the purpose of estimating term between water and bottom of water(river,lake and so on).
figure 1 scheme of GPR method
figure 2 Acquisition data GPR
figure 3 rawdata GPR
Field data was collected using a RTA ground penetrating radar system. Two separate antenna arrangements were used to generate "low" and "high"/low, medium and high. Continuous GPR measurements were recorded as the antenna arrangements were towed separately over the river adjacent to manual measurement locations.
figure 4 Final result GPR processing
The GPR data aws processed using the reflexw and others software to help good result. MATLAB software was also used to facilitate further post-processing and spectrum analysis.
figure 5 Final GPR result for subbottom profiling at river
Figure 5 also illustrates how the GPR arrangement may provide a means for delineation of the bottom of water. horizone 1(blue) is term between water with mud, while horizone 2(red) is thick of mud to compact soil/bedrock.
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