EFFECT OF SEDIMENT TRANSPORT ON TSUNAMI HAZARD AND BUILDING DAMAGE – AN INTEGRATED SIMULATION OF TSUNAMI INUDATION, SEDIMENT TRANSPORT AND DRIFTING VESSELS IN KESENNUMA CITY, MIYAGI PREFECTURE DURING THE GREAT EAST JAPAN EARTHQUAKE –
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- YAMASHITA Kei
- 東北大学 災害科学国際研究所
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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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- 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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- 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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- 土砂移動が及ぼす津波ハザード及び建物被害への影響－東日本大震災の宮城県気仙沼市における津波氾濫・土砂移動・船舶漂流の統合計算－
- ドシャ イドウ ガ オヨボス ツナミ ハザード オヨビ タテモノ ヒガイ エ ノ エイキョウ : ヒガシニホン ダイシンサイ ノ ミヤギケン ケセンヌマシ ニ オケル ツナミ ハンラン ・ ドシャ イドウ ・ センパク ヒョウリュウ ノ トウゴウ ケイサン
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Abstract
An integrated tsunami model consisting of models for simulating tsunami inundation, drifting objects and sediment transport, was newly developed to evaluate the effects of these multiple phenomena. A scenario of complex tsunami damage enlargement in a bay with bottleneck was revealed. The tsunami hazards in Kesennuma City, especially at the inner part of the bay such as Shishiori area, were enlarged by erosion in the bottleneck of the bay. The bathymetric change increased the drift distance of the drifting vessels. In addition, through the tsunami fragility functions based on dataset of actual damaged building and numerical results, it was evaluated that the 200 - 1,800 wooden buildings were washed away owing to sediment transport. Furthermore, it is found that the estimation accuracy of damage scale by the conventional fragility functions was suitable, although the estimated building damage near the sea and inland was under and overestimated, respectively.
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) 73 (2), I_355-I_360, 2017
Japan Society of Civil Engineers
