Author(s): Youichi Yasuda; Yuji Seo
Linked Author(s): Youichi Yasuda
Keywords: Fishway; Maintenance; Flood Stage; Local Flow; Multi-aquatic animals
Abstract: Generally, most of civil engineers would design a fishway based on references dealing with fishways only. But, it is difficult for benthic fish, crab, and shrimp to migrate upstream in most of pool-type fishways. Also, in most of fishways, there is a lot of sediment due to transported rocks and driftwood after flood stages. For the installation of the fishway which may help the preservation of the eco-system for multi-aquatic animals, it is necessary to clarify flow characteristics of fishway and the migration route for multi-aquatic animals in the fishway. In this paper, several failures of fishways are introduced, and the reason why most of fishways have failures has been discussed. Also, the migration routes for multi-aquatic animals in the pool-type fishway with a trapezoidal section have been shown. Further, a method to clear the pool-type fishway of transported rocks and driftwood, and other sediment has been discussed.
Year: 2009