EXPERIMENTAL INVESTIGATION ON HYDRAULIC JUMP CHARACTERISTICS AT DOWNSTREAM OF A DAM WITH VARYING STILLING BASINS

The elevation of the water surface by damming causes rapid flow downstream of the dam. To dissipate the energy in this flow, an energy dissipating structure, called a stilling basin, is needed. The purpose of this study is to analyze and select the flow characteristics of types of stilling basins between short, long vlughter, and sink bucket. The research method used is experimental, utilizing a circulating flume with dimensions of 7.5x24x491 cm and an ogee spillway with variations in the stilling basin: vlughter with a length of 5.7 cm (Short vlughter type), vlughter with a length of 19 cm (Long vlughter type), and sink bucket with a length of 11 cm (Sink bucket type). The results of this study show that the greater the discharge, the greater the specific energy after the hydraulic jump. The largest specific energy after the jump is found in the sink bucket type, followed by the long vlughter type, and the smallest in the short vlughter type. The conclusion is that the variation in shape and dimensions of the stilling basin can affect the output characteristics of the hydraulic jump, with specific energy after the jump being greater in the sink bucket type, followed by the short vlughter and long vlughter types, which are relatively the same but smaller, with the difference becoming more significant as the discharge increases.