Effects of Groin Type and Bed Properties on Flow in Groin Fields: Comparison of Fixed- and Mobile-Bed Experiments

Groin type and vegetation in groin fields directly affect flow field, bank protection, river evolution. Many studies focus on fixed-bed contexts, but there are few the influence of riverbed changes hydrodynamic characteristics around groins. In this study, three types groins investigated experimentally fixed mobile beds terms time-averaged characteristics, turbulence bed changes. both fixed- mobile-bed experiments, reduced erosion field main stream. Compared with experiment, velocity stream was decreased longitudinal intensity lateral momentum exchange were increased. an improved three-dimensional group (upstream wing submerged T-shaped group) produced a lower sediment scouring capacity, average scour depth, entrainment coefficient k than I-shaped groups.