Author(s): Katsutoshi Watanabe; Nozomu Oonaka
Linked Author(s):
Keywords: Ganlock; Bank protection; Velocity control; Secondary flow; Vortex structure
Abstract: In this study, in order to improve the disaster prevention performance of the Ganlock bank protection where the retaining wall method was put into practical use as a river bank protection, the characteristics of the flow velocity distribution and the internal flow condition of the rough surface of the new Ganlock improved from the old Ganlock were investigated. It was studied by a model experiment. In addition, the effect of controlling the primary flow velocity was studied by applying the rough surface of the new Ganlock to the curved channel. As a result, a large-scale and strong secondary flow was formed in the new Ganlock rough flow compared to the old Ganlock, and the effect of reducing the main flow velocity around the bank protection was recognized. In addition, a large-scale vortex structure was formed around the new Ganlock, and it was supposed that it contributed to the reduction effect of the primary flow velocity and the generation of the secondary flow. Furthermore, in the Ganlock flow, it became clear that the velocity near the side wall was lower than that in the smooth surface flow, and the high speed region moved more toward the center of the channel. From this, the effect of the main velocity control on the curved flow of the Ganlock rough surface flow was recognized.
Year: 2020