ABSTRACT
Different types of bank attached submerged structures have been investigated in the past. Their purposes are bank protection and enhancement of flow and morphological diversity in river restoration projects. Experiments with a movable bed were carried out to investigate hydraulic and morphological effects of a single submerged groyne. The investigated structures differ in two important aspects from similar structures: First, submerged groynes are very shallow and fully submerged whereas stream barbs etc. have sloped backs and thus are only partly submerged. Second, the investigated groynes are made of glued gravel to avoid sharp edges and to enable permeability. The influence on the flow field is comparable to investigations of e.g. stream barbs. However, the presented morphological results differ. Instead of a scour attached to the groyne head scouring was observed in a distinct distance downstream of the groyne. The results could be related to the shape of the investigated structure.
