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Published in:
2019 | OriginalPaper | Chapter
Analytical Groundwater Flow Calculations for Understanding the Flow and Erosion in a Coarse Sand Barrier
Authors : Adam Bezuijen, Vera van Beek, Esther Rosenbrand, Sepideh Akrami
Published in: Internal Erosion in Earthdams, Dikes and Levees
Publisher: Springer International Publishing
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Abstract
The coarse sand barrier (CSB) is a promising method to avoid ongoing backward erosion piping resulting in increased safety of a dike for this failure mechanism. Experiments are performed at different scales at Deltares, the Netherlands. These experiments show a significant increase in the critical head for structures with a CSB compared to structures without a CSB. The increase of critical head cannot only be ascribed to the lower erodibility of the coarser particles in the barrier, but also to the reduction of hydraulic load on these coarse particles in the barrier, resulting from the permeability contrast of barrier material and surrounding sand. To investigate the influence of a CSB on the flow pattern numerical and analytical calculations have been performed. This paper focusses on the analytical calculations. It will be shown that these can explain the increase in strength and the measured scaling effects.