A sand erosion problem in axial flow conditions on the example of contact erosion due to horizontal groundwater flow

摘要

The presented system of equations allows the qualitative interpretation of time dependent changes caused by a hydraulic force parallel to an interface of a base/filter combination. Thus it can be used to guide the design of experiments for studying the contact erosion and the sand erosion problem, respectively. The numerical results for the erosion process of a thin perturbed layer consisting of only few moving particles is justified by the observations of van der Meulen [3]. The transfer of the theoretical model to a real problem consideration is not possible as long as at least the order of magnitude of the parameters can't be estimated. The factor for the erosion starter points λ, for example, should be determinable by small scale tests with different materials. If these parameters are estimated first, it is essential to define a suitable criterion for the interpretation of the simulated results. As soon as a practical criterion is formulated and the parameters are specifically applicable, it is possible to calculate the loss of material and hence the subsidence without further ado.