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Many were destroyed by tsunami overflows. In this research, physical experiments were conducted using various breakwater cross-sections to clarify the exact failure mechanisms caused by tsunami overflows. Using the experimental results, the cause for the breakwaters' collapse can be verified using the safety factor of sliding, overturning and bearing capacity of each breakwater. If the overflows scoured the rubble mound, the safety margin was estimated using a post-scouring cross-section. Scouring by overflows decreases the rubble mound's bearing capacity, increasing the likelihood that breakwater would collapse. When the scouring reaches the bottom of the caisson, it generates a hole that the caisson gradually falls 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Kenichiro"},{"@language":"ja","@value":"下迫 健一郎"}],"jpcoar:affiliationName":[{"@language":"en","@value":"Port and Airport Research Institute"},{"@language":"ja","@value":"(独法)港湾空港技術研究所"}]},{"@id":"https://cir.nii.ac.jp/crid/1410290696447532802","@type":"Researcher","personIdentifier":[{"@type":"NRID","@value":"9000258243892"}],"foaf:name":[{"@language":"en","@value":"GEN Hayao"},{"@language":"ja","@value":"厳 駿"}],"jpcoar:affiliationName":[{"@language":"en","@value":"Praia Inc."},{"@language":"ja","@value":"(株)プライアコンサルタント"}]}],"publication":{"publicationIdentifier":[{"@type":"EISSN","@value":"18838944"},{"@type":"PISSN","@value":"18842399"}],"prism:publicationName":[{"@language":"en","@value":"Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)"},{"@language":"ja","@value":"土木学会論文集Ｂ２（海岸工学）"},{"@value":"土木学会論文集B2(海岸工学)"},{"@language":"en","@value":"Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)"},{"@language":"ja","@value":"海岸工学論文集"}],"dc:publisher":[{"@language":"en","@value":"Japan Society of Civil Engineers"},{"@language":"ja","@value":"公益社団法人 土木学会"}],"prism:publicationDate":"2013","prism:volume":"69","prism:number":"2","prism:startingPage":"I_916","prism:endingPage":"I_920"},"reviewed":"false","url":[{"@id":"https://www.jstage.jst.go.jp/article/kaigan/69/2/69_I_916/_pdf"}],"availableAt":"2013","foaf:topic":[{"@id":"https://cir.nii.ac.jp/all?q=Tsunami","dc:title":"Tsunami"},{"@id":"https://cir.nii.ac.jp/all?q=Breakwater","dc:title":"Breakwater"},{"@id":"https://cir.nii.ac.jp/all?q=Overflow","dc:title":"Overflow"},{"@id":"https://cir.nii.ac.jp/all?q=Stability","dc:title":"Stability"},{"@id":"https://cir.nii.ac.jp/all?q=%E6%B4%A5%E6%B3%A2","dc:title":"津波"},{"@id":"https://cir.nii.ac.jp/all?q=%E9%98%B2%E6%B3%A2%E5%A0%A4","dc:title":"防波堤"},{"@id":"https://cir.nii.ac.jp/all?q=%E8%B6%8A%E6%B5%81","dc:title":"越流"},{"@id":"https://cir.nii.ac.jp/all?q=%E5%AE%89%E5%AE%9A%E6%80%A7","dc:title":"安定性"}],"relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1390001205319546368","@type":"Article","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"ja","@value":"津波・高潮と高波の複合作用による低基混成堤への波力特性の検討"},{"@language":"en","@value":"STUDY ON WAVE FORCE ACTING ON BREAKWATER AGAINST OVERFLOW WITH HIGH WAVES"},{"@language":"ja-Kana","@value":"ツナミ ・ タカシオ ト タカナミ ノ フクゴウ サヨウ ニ ヨル テイキ コンセイテイ エ ノ ハリョク トクセイ ノ ケントウ"}]},{"@id":"https://cir.nii.ac.jp/crid/1390282680297131264","@type":"Article","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"ja","@value":"陸閘の被災に与える戻り流れの影響に関する数値計算"},{"@language":"en","@value":"NUMERICAL ANALYSIS ON THE EFFECT OF TSUNAMI RETURN FLOWS TO THE DAMAGES OF FLOODGATES"},{"@language":"ja-Kana","@value":"リクコウ ノ ヒサイ ニ アタエル モドリ ナガレ ノ エイキョウ ニ カンスル スウチ ケイサン"}]},{"@id":"https://cir.nii.ac.jp/crid/1390282680297137024","@type":"Article","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"ja","@value":"越流時間の長い津波による混成防波堤の挙動"},{"@language":"en","@value":"INSTABILITY MECHANISM OF COMPOSITE BREAKWATER UNDER CONTINUOUS TSUNAMI OVERFLOW"},{"@language":"ja-Kana","@value":"エツリュウ ジカン ノ ナガイ ツナミ ニ ヨル コンセイ ボウハテイ ノ キョドウ"}]},{"@id":"https://cir.nii.ac.jp/crid/1390282680297180672","@type":"Article","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"ja","@value":"津波持続時の基礎地盤の侵食にともなう混成堤の変状過程"},{"@language":"en","@value":"INSTABILITY OF BREAKWATER FOUNDATION DUE TO SEEPAGE EROSION DURING CONTINUED TSUNAMI OVERFLOW"},{"@language":"ja-Kana","@value":"ツナミ ジゾクジ ノ キソ ジバン ノ シンショク ニ トモナウ コンセイテイ ノ ヘンジョウ カテイ"}]}],"dataSourceIdentifier":[{"@type":"JALC","@value":"oai:japanlinkcenter.org:1002544223"},{"@type":"CROSSREF","@value":"10.2208/kaigan.69.i_916"},{"@type":"CIA","@value":"130004551221"},{"@type":"CROSSREF","@value":"10.2208/kaigan.71.i_1111_references_DOI_N6rlSGHAHzwu8twyQyXc57k7SkG"},{"@type":"CROSSREF","@value":"10.2208/kaigan.71.i_1069_references_DOI_N6rlSGHAHzwu8twyQyXc57k7SkG"},{"@type":"CROSSREF","@value":"10.2208/kaigan.71.i_1165_references_DOI_N6rlSGHAHzwu8twyQyXc57k7SkG"},{"@type":"CROSSREF","@value":"10.2208/kaigan.72.i_1045_references_DOI_N6rlSGHAHzwu8twyQyXc57k7SkG"}]}