Author(s): Kouki Onitsuka; Juichiro Akiyama; Mirei Shige-Eda; Tatsuya Nakagawa; Hiroaki Ozeki; Hironori Hatanaka
Linked Author(s):
Keywords: Energy dissipater; Hydraulic jump; Drag and lift force
Abstract: A habitat of the migratory fish is separated after construction of a drop dissipater in rivers. Recently, a construction method by making use of both a steep channel and pool has attracted a great deal of public attention. The hydraulic jump may occur in the pool when the river is flooded. If the location of the hydraulic jump can be controlled, the cost decreases. Because the pool length can be reduced. Energy dissipaters such as USBR type I, II III and IV have been used to control the location of the hydraulic jump at the spillway of the dam. However, such a structure is not suitable for the river, because the shape is not suitable from a point of view of landscape. Yasuda (2004) pointed out that the cylinder type blocks are suitable. In contrast, it is to be desired that all blocks receive the same drag and lift force. Because if the drag and lift force are different from each block, design and construction are difficult. In this study, arrangements of the circle blocks were changed systematically and drag and lift force are measured. As a result, the suitable arrangement is found.
Year: 2007