Scour downstream of a corrugated apron under wall jets

Abstract

Experiments were performed over smooth and corrugated aprons with different corrugation dimensions to study the scour and flow characteristics under submerged wall jets condition. The scour depth and length are significantly lower for corrugated than smooth rigid aprons. The maximum reductions in scour depth and length are 79 and 83%, respectively. Optimum scour depth and length are found for aspect ratio (ratio of corrugation wave length to amplitude) three for corrugated apron. The factors affecting scour depth and length were analyzed graphically, and empirical equations are proposed for predicting maximum scour depth and length, and the point of maximum scour depth for corrugated aprons. Velocity, turbulence characteristics, and Reynolds stress in scour holes for smooth and corrugated aprons were also studied. HIGHLIGHT This paper presents the scour downstream of a corrugated apron and flow characteristics under submerged wall jets. Here, scour depth and length reduces more significantly than for the other apron. In this, we have tried to develop an empirical equation on single size sediment considering all the flow parameters and apron parameters. Besides this, we have also conducted study related to turbulence and shear stress and velocity vector profile.;

Keywords

• corrugated apron
• reynolds shear stress
• scour
• turbulence
• wall jets