IMPROVEMENT OF TSUNAMI-INDUCED SEDIMENT TRANSPORT MODEL BY CONSIDERING SATURATED CONCENTRATION IN SUSPENSION WITH STRONG UNSTEADY FLOWS
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- YAMASHITA Kei
- ハワイ大学
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- SUGAWARA Daisuke
- ふじのくに地球環境史ミュージアム
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- ARIKAWA Taro
- 中央大学 理工学部都市環境学科
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- SHIGIHARA Yoshinori
- 防衛大学校 システム工学群建設環境工学科
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- TAKAHASHI Tomoyuki
- 関西大学 社会安全学部
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- IMAMURA Fumihiko
- 東北大学 災害科学国際研究所
Bibliographic Information
- Other Title
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- 強い非定常流れにおける飽和浮遊砂濃度を考慮した津波土砂移動モデルの改善
- ツヨイ ヒテイジョウ ナガレ ニ オケル ホウワ フユウ サ ノウド オ コウリョ シタ ツナミ ドシャ イドウ モデル ノ カイゼン
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Description
In this study, factors causing the underestimation of morphological changes due to tsunami-induced sediment transport in Kesennuma Bay with narrows during the Great East Japan Earthquake and Tsunami have been numerically investigaed. Based on the estimation, the saturated concentration of suspention model was improved. It was found out that strong unsdeady flows occerred at narrows. The numerical results from conventional saturated concentration model implied that at the narrows, suspension concentration and sediment supply from the bottom to the suspension were limited by high concentration in suspension, leading to underestimation of morphological change, i.e., erosion and deposition. By considering effects of strong unsteady flows on concentration of suspention, a new form of saturated concentration model based on log-wake law and Kármán constant theory has been proposed. Numerical results of the erosion and deposition in Kesennuma Bay were improved. It is expected that accuracy of evaluation about not only morphological changes but also inundation area and damages are improved.
Journal
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- Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)
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Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 74 (2), I_325-I_330, 2018
Japan Society of Civil Engineers