stress Distribution at an Overfall
ABSTRACT THE formation and movement of a headcut in an earth emergency spillway often constitutes the major source of damage to the structure. The mechanics of headcut formation and growth are, however, largely unknown. The following paper describes current research in measuring the hydraulic stresses at the boundary of a turbulent overfall. Using a fixed-bed plexiglass model instrumented with hot-film anemometry, the variations in boundary shear stress were measured and are presented for each of four flow rates.