Study on the disruption of water flow in the system of tailrace tunnel combined with diversion tunnel

Study on the Influence of Tailrace Tunnel Outlet Bottom Slope on Water Level Fluctuation in the Tailrace Surge Tank

“…Unlike flat connection, in this case water body swarming into tailrace surge tank not only is slope water body. Due to the existence of tailrace tunnel outlet bottom slope, under the same condition the water depth in tailrace tunnel combined with diversion tunnel is higher but flow rate is smaller than that of the previous case, so this hydraulics phenomenon of "water break" will not happen in the junction of tailrace tunnel and diversion tunnel [5] . Water can be added to slope water body in a timely manner on tailrace tunnel combined segments, so the first amplitude of water level increased in the tailrace surge tank is larger than the former case, from which the corresponding peak is the maximum water level in the tailrace surge tank under the slope connection.…”