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25.02.2018 :: You are here: Research / Near Surface Geophysical Investigation / GPR techniques and Geotomography /
Projects: GPR techniques and Geotomography
Presently, there are no active projects in this field! (June 2011)
GPR techniques and Geotomographyaulic properties
High resolution geotomography and 3-D GPR techniques to characterize Quarternary gravel deposits and their hydraulic properties
Quarternary sand and gravel deposits characterise one of the most important aquifer type in South Germany and in many other parts of the world. To understand and model groundwater flow and contaminant transport in these high heterogenous systems a detailed image of the subsurface is needed. Techniques must be developed which lead to high resolution characterisation of sedimentological structures and their hydraulic properties in the regions of interest. Geophysical methods and especially their combination with hydrogeological data and sedimentological knowledge seem to be a promising tool for a better understanding of such deposits and their hydraulic response.
Applied geophysical methods mainly include surface GPR measurements and tomographical imaging. On the picture below you can see our GPR equipment during profiling in the Neckar valley. GPR, which is a time domain electromagnetical technique similar to reflection seismics, provides high resolution structural information of the shallow subsurface. Therefore, it is an ideal tool for the 3-D visualization of different sedimentological units in unconsolidated deposits.
Geotomography is similar to the tomographical imaging techniques known from medicine. It represents a possibility to obtain and correlate physical properties of the geological medium - e.g. seismic or EM velocity distribution - between boreholes. The calculated tomogramms can be interpreted in view of sedimentological units and hydraulic properties. On the picture below, you can see our Borehole Radar System with 100 MHz antennas during field work.