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 adjustments are effectively quantified utilizing electric resistivity tomography. Numerical simulation of water circulation in a dike version is used to estimate the range of water content material. Modeling of man-made info units is used to judge the standard of resistivity quantification utilizing ERT. An ensemble method is proposed to enhance the translation of ERT inversions.

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The water level in the basin was raised to 1 m below the dike crest as can be seen in Fig. 1. 43 m took one and a half days. After the following night, a steady state had been established and a final ERT measurement was taken before the water level was lowered again. 2, two case studies are chosen to illustrate the advantages and disadvantages of surface-based ERT for water content estimation within the dike model. Case Study I: Rainfall Event A first example is given in Fig. 2). In Fig. 1: Overview of measurements taken on the BAW full-scale model dike.

2). The geometry factors for these arrays can be calculated from eq. 2: Arrays used in ERT surveys in this study, with a denoting the electrode spacing, while n · a is a multiple of a. ). For the Wenner-Schlumberger array (Fig. 2), n modifies the distance between the current and the potential electrodes while the distance between the potential electrodes stays constant. For the Dipole-Dipole array, the distance between both current electrodes and both potential electrodes stays constant, while the separation between these dipoles is modified by n.

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).

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