In recent decades, there have been individual cases of damage to geotextile filters due to clogging by flocculated ochre products. This process is defined as ochre clogging and has been extensively explained in recent theoretical studies (Tophoff et al., 2022). Several revetments of tidally influenced German North Sea estuaries have been damaged due to a severe reduction in the permeability of geotextiles. Therefore, experimental investigations of granular and geotextile filter constructions were carried out to better understand filter clogging. The investigations reproduce a revetment section at a scale of 1:1. For this purpose, the clogging process in the fluctuating water level or clogging zone was reproduced as a purely chemical iron precipitation. Ten short-term tests (10 h) and one long-term test (50 h) were carried out in total. The tests show that the process involves internal clogging and that the iron precipitates adhere immovably to the filter structure, reducing the pore space and permeability of the filter. This process is considered less problematic for granular filters. A reduction in permeability was measured in some cases for geotextile filter designs. Different geotextile material parameters appear to influence the iron ochre clogging tendency.

近几十年来，曾出现过因絮凝赭石产品堵塞而导致土工织物过滤器损坏的个别案例。这一过程被定义为赭石堵塞，并在最近的理论研究中得到了广泛的解释（Tophoff 等人，2022）。由于土工织物渗透性严重下降，受潮汐影响的德国北海河口的几处护岸已被损坏。因此，对颗粒和土工织物过滤结构进行了实验研究，以更好地了解过滤器堵塞。调查以 1:1 的比例再现了护岸断面。为此，将波动水位或堵塞区的堵塞过程再现为纯化学铁沉淀。总共进行了 10 次短期测试（10 h）和 1 次长期测试（50 h）。测试表明，该过程涉及内部堵塞，并且铁沉淀物无法移动地粘附在过滤器结构上，从而减少了过滤器的孔隙空间和渗透性。对于颗粒过滤器来说，这个过程被认为问题较少。在某些情况下，土工织物过滤器设计测量到渗透性降低。不同的土工织物材料参数似乎会影响铁赭石的堵塞倾向。