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By Jörg Rings

The water content material evolution of version dikes is monitored with geophysical tools. Water content material alterations are effectively quantified utilizing electric resistivity tomography. Numerical simulation of water stream in a dike version is used to estimate the range of water content material. Modeling of man-made information units is used to judge the standard of resistivity quantification utilizing ERT. An ensemble technique is proposed to enhance the translation of ERT inversions.

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G. , 2007). The simulated measurements are subsequently inverted using the same inversion parameters as for the observed data sets. The synthetic resistivity model at time t0 consists of a low resistivity top layer and two nested blocks of higher resistivity representing the dike body (Fig. 6a). 4: Resistivity distributions (a) before and (b) after a short intense rainfall of 2 hours on August 4th. the dike body, and an area with lower resistivity representing the part of the dike towards the drain (right block in the image).

5. At greater depths, the anomalous resistivity increase is reduced to less than 10%. Case Study II: Flooding Experiment As a second case study, a flooding experiment was conducted. 9). Fig. 10 shows the height of the water level during the flooding experiment over time. Marked with letters are the measurement times for which Fig. 11 shows the resistivity tomograms. 6: (a) Model block arrangement of the synthetic resistivity model, with low resistivity within the top layer and two blocks representing the dike body, with lower resistivity towards the drain (right block).

1 Principles Time-domain reflectometry (TDR) is one of the geophysical methods based on the different dielectrical properties of dry soil and water. This method originated from cable testing, where damaged spots of subsurface telecommunication lines were detected by measuring the two-way travel time of a transmitted signal reflected at the damaged spot. TDR commonly uses metallic rods as transmission lines. At the end of these rods, an electromagnetic signal is reflected. By measuring the two-way travel time, and because the length of the probe is known, the effective dielectric permittivity ε of the soil surrounding the rods can be determined.

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