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

Yoshiyuki Shirotori, Kozo Watanabe, Keiko Udo, Akira Mano

    Research output: Chapter in Book/Report/Conference proceedingConference 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 languageEnglish
    Title of host publicationAdvances in Water Resources and Hydraulic Engineering - Proceedings of 16th IAHR-APD Congress and 3rd Symposium of IAHR-ISHS
    PublisherSpringer-Verlag Berlin Heidelberg
    Pages815-820
    Number of pages6
    ISBN (Print)9783540894643
    Publication statusPublished - 2009 Jan 1
    Event16th 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 202008 Oct 23

    Other

    Other16th 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/TerritoryChina
    CityNanjing
    Period08/10/2008/10/23

    Keywords

    • Cohesivity
    • Finite volume method
    • Grain distribution
    • Nonequilibrium sediment transport
    • Suspended sediment

    ASJC Scopus subject areas

    • Civil and Structural Engineering

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