Monitoring the water content evolution of dikes by Jörg Rings

By Jörg Rings

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

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Without this drain, the water would seep out of the slope with all the consequences regarding erosion and slope stability. The detailed setup of the dike model and its permanent instrumentation is described in Scheuermann (2005). 2), the dike model is equipped with 12 vertically installed flat band cables with lengths between 1 and 3 m. Six of them are installed on the land-side slope of the dike, where ERT measurements were conducted (Fig. 2). Data acquisition time for all 12 Spatial TDR cables takes only 5 minutes (Scheuermann, 2005).

Marked are the layer boundary and the expected decrease in resistivity of 44% on the colour scale. ued to be taken twice a day until a steady state was reached (E). In (B), 5 hours after the flooding started, only a slight change in resistivity can be seen as not much water had flown through the dike. Overnight, more water seeped through the dike and a decrease in resistivity at greater depth can be seen, though higher regions of the dike are not reached due to the low water level (C). 7: Distribution of relative sensitivity difference before and after the rainfall experiment.

It is based on a waterproof sealing of plastic, so that infiltrating water will be stopped at the base. This will cause lateral flow to a drain of gravel material at the foot of the landside slope. Without this drain, the water would seep out of the slope with all the consequences regarding erosion and slope stability. The detailed setup of the dike model and its permanent instrumentation is described in Scheuermann (2005). 2), the dike model is equipped with 12 vertically installed flat band cables with lengths between 1 and 3 m.

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