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Recently, slit type Sabo dams have been constructed by considering river environments. But, there is little information on energy dissipator of the slit type Sabo dams. This paper shows a systematical investigation on energy dissipators of Sabo dams with a single slit. The flow conditions passing over the slit are similar to those in abruptly expanding channels, and both symmetric and asymmetric flows are existed. A systematical investigation yields that sub-dams downstream of the slit type Sabo dams are effective for the formation of symmetric flows in the stilling basin, and that the flow conditions can be classified into two types. Also, the hydraulic condition required to form each flow condition has been determined. Accordingly, a flow chart of hydraulic design for energy dissipator of Sabo dams with a single slit has been proposed. Further, it has been confirmed experimentally that even if the slit is closed due to debris flows, symmetric plunging flows can be formed in the designed stilling basin.

HYDRAULIC CHARACTERISTICS OF ENERGY DISSIPATORS OF SLIT TYPE SABO DAMS