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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Water engineering : Investigation on streambed sediment and flow structure in the arase dam
Investigation on streambed sediment and flow structure in the arase dam
Author : TERUNORI OHMOTO(1), RYUICHI HIRAKAWA(2)& HIROAKITANIGUCHI(3)
ABSTRACT
Focusing on the river channel downstream of the Arase Dam, whose removal began in September, 2012,this study examined variations in sandbar sizein the past (1966-2006) and tried to elucidate the structure of fine sediment deposition.Bed materials and the aerial photographs surveyed by the Prefectural government were used to investigate the change in the river channel.ADCP was used for the measurement of flow velocity and suspended sediment concentration.The particle size distribution of fine sediment covering gravel bed were measured by a laser diffraction scattering method.Field measurements clarified that the flow showed clearly discernible three-dimensional flow structures and the fine sediment deposited on gravel surfaces in the near-bankregions in the straight river. From the relation between the deposition of fine sediment and flow pattern, it has been suggested that the deposition of fine sediment is determined by secondary flow cells.
File Size : 1,271,144 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Water engineering
Date Published : 20/08/2015
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