Assessing Riverbed Surface Destabilization Risk Downstream Isolated Vegetation Elements

A few decades ago, river erosion protective approaches were widely implemented, such as straightening the course, enhancing riverbed/bank stability with layers of concrete or riprap, and increasing channel conveyance capacity (i.e., overwidening). However, recent research has established that practices can be tremendously costly adversely affect rivers’ ecological health. To alleviate these effects, green restoration emerged a sustainable environmentally friendly approach reduce negative impact riverbed bank destabilization flooding. One typical measures, especially for instream habitat improvement, is establishment vegetation, which leads to more diversified flow regime, availability serving refugia aquatic species. Within perspective presented above, flow–vegetation interaction problems several received significant attention. In studies, rigid rods have commonly been used simulate vegetative roughness elements without directly assessing potential. Here, an experimental study carried out investigate effect different vegetation porosity on near-bed hydrodynamics potential range simulated Specifically, field downstream, four distinct recorded using acoustic Doppler velocimetry (ADV), assuming about same solid volume fraction elements. addition, bed assessed by recording optical means (a He-Ne laser camera system) entrainment rate 15 mm particle resting uniform surface number impulses above critical value. Results revealed value at normalized distance equal two good indicator cylinder five other assess The findings from this interesting geomorphological implications regarding (removal coarse particles induced high magnitude turbulent impulses) successful seedlings downstream vegetation.