Numerical simulations of cohesive sediment transportation in coastal waters considering time-dependent sediment resuspension and deposition

Kazuaki Hiramatsu, Shiomi Shikasho, Ken Mori

研究成果: ジャーナルへの寄稿記事

抄録

The Ariake Sea, which is a typical semi-closed bay located in Kyushu Island, western Japan, has a maximum tidal range of about 6m in spring tide and has vast tidal flats composed of both sandy bottom areas and muddy bottom areas. In this study, 2-dimensional depth-averaged finite difference numerical models have been developed for predicting the tidal flow velocity and suspended sediment concentration in the Ariake Sea. In the suspended sediment transportation model, time-dependent sediment resuspension and deposition were modeled as response to the tidal flow by considering the presence of cohesive bottom sediment. The model results were compared with the in situ measurements of suspended sediment concentration and tidal flow velocity at several stations in Isahaya Bay located at the western part of the Ariake Sea, and with the concentration map of suspended sediment concentration estimated from the Landsat Thematic Mapper image. The results indicated that the models were able to accurately reproduce the measured values of suspended sediment concentration and tidal flow velocity and the estimated general pattern of the concentration map.

元の言語英語
ページ(範囲)1-14
ページ数14
ジャーナルJournal of the Faculty of Agriculture, Kyushu University
46
発行部数1
出版物ステータス出版済み - 2001

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Oceans and Seas
coastal water
sediments
Water
Islands
Japan
Landsat
tides
suspended sediment

All Science Journal Classification (ASJC) codes

  • Agricultural and Biological Sciences (miscellaneous)

これを引用

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abstract = "The Ariake Sea, which is a typical semi-closed bay located in Kyushu Island, western Japan, has a maximum tidal range of about 6m in spring tide and has vast tidal flats composed of both sandy bottom areas and muddy bottom areas. In this study, 2-dimensional depth-averaged finite difference numerical models have been developed for predicting the tidal flow velocity and suspended sediment concentration in the Ariake Sea. In the suspended sediment transportation model, time-dependent sediment resuspension and deposition were modeled as response to the tidal flow by considering the presence of cohesive bottom sediment. The model results were compared with the in situ measurements of suspended sediment concentration and tidal flow velocity at several stations in Isahaya Bay located at the western part of the Ariake Sea, and with the concentration map of suspended sediment concentration estimated from the Landsat Thematic Mapper image. The results indicated that the models were able to accurately reproduce the measured values of suspended sediment concentration and tidal flow velocity and the estimated general pattern of the concentration map.",
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N2 - The Ariake Sea, which is a typical semi-closed bay located in Kyushu Island, western Japan, has a maximum tidal range of about 6m in spring tide and has vast tidal flats composed of both sandy bottom areas and muddy bottom areas. In this study, 2-dimensional depth-averaged finite difference numerical models have been developed for predicting the tidal flow velocity and suspended sediment concentration in the Ariake Sea. In the suspended sediment transportation model, time-dependent sediment resuspension and deposition were modeled as response to the tidal flow by considering the presence of cohesive bottom sediment. The model results were compared with the in situ measurements of suspended sediment concentration and tidal flow velocity at several stations in Isahaya Bay located at the western part of the Ariake Sea, and with the concentration map of suspended sediment concentration estimated from the Landsat Thematic Mapper image. The results indicated that the models were able to accurately reproduce the measured values of suspended sediment concentration and tidal flow velocity and the estimated general pattern of the concentration map.

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