Experimental investigation on the local scour characteristics around groynes using a hydraulic model: Experimental investigation on the local scour characteristics around groynes

Scour holes resulting from the installation of a groyne are considered to perform the environmental function of providing a habitat and a haven for various aquatic organisms during floods, hence, the need for studies on the scour area and its volume near a groyne beyond the scope of past discussions on their stability. In this study, hydraulic experiments were conducted in fixed and movable beds to examine the flow pattern, bed change and scour depth and hole around a groyne. The results of the fixed-bed experiment indicated an effect on the flow change in the main channels and recirculation zones following the installation of a groyne. Changes in tip velocity and flow angle as the scour factors around a groyne were quantitatively compared as well. Through the movable-bed experiment, the scour-hole shape, scour area, scour depth and volume of bed change were examined and compared.