Fine sediment deposition by floods on the upstream of a weir with a channel bend

Yoshiyuki Shirotori; Kozo Watanabe; Keiko Udo; Akira Mano

Fine sediment deposition by floods on the upstream of a weir with a channel bend

Yoshiyuki Shirotori, Kozo Watanabe, Keiko Udo, Akira Mano

Hazard and Risk Evaluation Research Division

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

On the upstream of Atago weir, Hirose River, Japan, the sedimentation phenomenon is complex due to the coexistence of the weir and channel bend. Moreover, fine sediment accumulates on the river bed notably not only the floodplain. In this study, we conducted field observation and numerical computation. From the observation results, we found that fine sediment is the major component in the flood water and accumulates significantly close to the inner bank (silt and clay= 55% in the maximum). In the numerical computation, we calculated the flow using finite volume method with unstructured grid. The suspended-sediment transport was calculated by the advection-diffusion equation considering settling and resuspension. By considering the weir and cohesivity of the fine sediment, we reproduced the settling-resuspension characteristics of the fine sediment. From this calculation result, the deposition and erosion region was indicated.

Original language	English
Title of host publication	Advances in Water Resources and Hydraulic Engineering - Proceedings of 16th IAHR-APD Congress and 3rd Symposium of IAHR-ISHS
Publisher	Springer-Verlag Berlin Heidelberg
Pages	815-820
Number of pages	6
ISBN (Print)	9783540894643
Publication status	Published - 2009 Jan 1
Event	16th Congress of Asia and Pacific Division of International Association of Hydraulic Engineering and Research, APD 2008 and the 3rd IAHR International Symposium on Hydraulic Structures, ISHS 2008 - Nanjing, China Duration: 2008 Oct 20 → 2008 Oct 23

Other

Other	16th Congress of Asia and Pacific Division of International Association of Hydraulic Engineering and Research, APD 2008 and the 3rd IAHR International Symposium on Hydraulic Structures, ISHS 2008
Country	China
City	Nanjing
Period	08/10/20 → 08/10/23

Keywords

Cohesivity
Finite volume method
Grain distribution
Nonequilibrium sediment transport
Suspended sediment

ASJC Scopus subject areas

Civil and Structural Engineering

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Fine sediment deposition by floods on the upstream of a weir with a channel bend. / Shirotori, Yoshiyuki; Watanabe, Kozo; Udo, Keiko; Mano, Akira.

Advances in Water Resources and Hydraulic Engineering - Proceedings of 16th IAHR-APD Congress and 3rd Symposium of IAHR-ISHS. Springer-Verlag Berlin Heidelberg, 2009. p. 815-820.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Shirotori, Y, Watanabe, K, Udo, K & Mano, A 2009, Fine sediment deposition by floods on the upstream of a weir with a channel bend. in Advances in Water Resources and Hydraulic Engineering - Proceedings of 16th IAHR-APD Congress and 3rd Symposium of IAHR-ISHS. Springer-Verlag Berlin Heidelberg, pp. 815-820, 16th Congress of Asia and Pacific Division of International Association of Hydraulic Engineering and Research, APD 2008 and the 3rd IAHR International Symposium on Hydraulic Structures, ISHS 2008, Nanjing, China, 08/10/20.

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abstract = "On the upstream of Atago weir, Hirose River, Japan, the sedimentation phenomenon is complex due to the coexistence of the weir and channel bend. Moreover, fine sediment accumulates on the river bed notably not only the floodplain. In this study, we conducted field observation and numerical computation. From the observation results, we found that fine sediment is the major component in the flood water and accumulates significantly close to the inner bank (silt and clay= 55% in the maximum). In the numerical computation, we calculated the flow using finite volume method with unstructured grid. The suspended-sediment transport was calculated by the advection-diffusion equation considering settling and resuspension. By considering the weir and cohesivity of the fine sediment, we reproduced the settling-resuspension characteristics of the fine sediment. From this calculation result, the deposition and erosion region was indicated.",

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