The effectiveness of a vertical inserted geotextile against internal erosion, in particular backward erosion, has been investigated. Some small- and medium-scale tests were performed as well as a field-scale test and compared with test series without any erosion mitigating measure. All tests demonstrated that the geotextile shield was very effective to prevent backward erosion. Numerical analysis showed that it was more effective than an impermeable sheet pile of the same length. The paper describes the technique in more detail as well as the results of numerical calculations. Furthermore, the test facilities are describe
