1.

論文

論文
楳田, 真也 ; 斎藤, 武久 ; 古路, 裕子 ; 中口, 彰人 ; 石田, 啓
出版情報: 土木学会論文集B3(海洋開発)= Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering).  69  pp.I_323-I_328,  2013-01-01.  土木学会 = Japan Society of Civil Engineers
URL: http://hdl.handle.net/2297/40507
概要: 海岸護岸上に設置されていた透過性のある防波柵が背後地の被害軽減に役立ったと推測される事例が確認されているものの,防波柵の津波浸水流の低減効果や減災機能の定量的な評価はされていない.本研究では津波に対する防波柵の効果や津波波力の基本特性を明ら かにするために,護岸や柵の構造的条件や段波津波の条件を系統的に変化させた段波実験を行い,柵衝突時の段波津波の挙動,重複波高の増幅,浸水深・流速及び波力の低減比率を調べた.その結果,柵の遮蔽率が一定の場合,浸水流速の低減効果は相対的波高が小さい程高まるが,浸水深や作用波力は重複波高が柵高の半分以上柵高以下の段波に対して低減効果が高まること,不透過壁の波力と比べた防波柵の波力の減少量は柵面での遮蔽面積の減少分より大きく,防波柵にかかる波力はかなり低減できる可能性があること等が分かった.The reduction of tsunami inundation flow and tsunami force by a porous vertical barrier installed on a seawall was investigated to give a better understanding of effects of coastal structures on tsunami hazard mitigation. Laboratory experiments of permeable and impermeable wave barriers exposed to breaking bore were carried out to examine variations in wave height amplifications, inundation flows and wave forces acting on barriers. It turns out that the porous barrier can reduce the inundation depth and discharge effectively. The reduction effects on the inundation depth and discharge are mainly governed by the porosity of barrier and the relative tsunami height to barrier height. The reduction of inundation velocity is less than that of inundation depth. When tsunami height in front of a porous barrier is between 0.5 and 1.0 with respect to barrier height, the wave force acting on the barrier can be significantly reduced in comparison with that of the impermeable barrier. This is because that the reduction of wave force is influenced by variations in tsunami height in front of the porous barrier. 続きを見る
2.

論文

論文
荒井, 秀和 ; 阿曽, 克司 ; 宮島, 昌克 ; 喜多, 敏春 ; 野村, 尚樹
出版情報: 土木学会論文集A1(構造・地震工学)= JSCE Journal of Earthquake Engineering.  69  pp.I_1021-I_1033,  2013-01-01.  土木学会 = Japan Society of Civil Engineers
URL: http://hdl.handle.net/2297/38887
概要: In the sea of Japan side, the possibility of tsunami generation by ocean trench type of earthquakes may be low, therefor e investigation and study of tsunami measures against this type had been insufficient than the Pacific Ocean. In the above situation, based on what has been discussed, like the Central Disaster Management Council after the Great East Japan Earthquake and the knowledge of the past, Some tsunami sources acting on Ishikawa Prefecture as big impact were selected. And then the simulations of the tsunami intrusion on the land were performed. Tsunami source were set in consideration of the integration of active faults from marine geological survey of previous results. Tsunami analysis was performed using the latest LP terrain data. It was conformed that the assumed Tsunami source generated the tsunami bigger than historical maximum tsunami on this coastline. 日本海側は海溝型地震による津波の発生の可能性が低いとされており,太平洋側に比較して津波に関する調査や対策の検討が不足している現実がある.このような中,石川県ではこれまでの知見と東日本大震災後に中央防災会議等で議論された内容を踏まえ,石川県に影響の大きな津波波源を設定し陸域遡上の検討を行った.具体的には,既往の海底地質調査結果から活断層の連動等を考慮し津波波源として設定し,最新の航空レーザー測量データ等を用いた遡上解析を実施し,陸域の浸水状況を把握するともに近海での津波収斂箇所を把握した.また,今回想定した最大クラスの想定波源は、沿岸に既往最大津波以上を発生させることができた. 続きを見る
3.

論文

論文
由比, 政年 ; 阿部, 成紀
出版情報: 土木学会論文集B3(海洋開発)= Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering).  69  pp.I_491-I_496,  2013-01-01.  土木学会 = Japan Society of Civil Engineers
URL: http://hdl.handle.net/2297/40506
概要: 日本海沿岸においてもこれまでに多くの津波災害が報告されている.本研究では,過去に日本海東縁部で発生し,能登半島に襲来した3つの歴史津波(1833年山形沖,1741年渡島大島, 1964年新潟沖,1983年日本海中部)を対象に非線形長波モデル に基づく数値解析を行ってその伝播特性を検討した.数値計算結果は痕跡高記録およびNOWPHAS波浪観測波形と良好に一致し,その有効性が確認された.4つの津波はいずれも能登半島北方に広がる浅瀬領域で屈折しエネルギー集中による波高増幅を伴って半島北岸に襲来する特性を示した.山形および新潟沖を波源とする場合は, 半島北岸中央部で最大波高を取る波高分布となり,より北方に波源が位置する場合には,半島北岸で多峰的な波高分布を示す結果となった. Historically, tsunami disasters have been repeated on the Japan Sea coast. Among them, this study focuses on tsunamis that have caused various damages to the Noto Peninsula, Ishikawa, Japan. The propagation of four representative historical tsunamis that originated in the eastern margin of the Japan Sea were simulated on the basis of the Nonlinear Shallow Water Equations. The applicability of the numerical model was verified through comparison with historical records and NOWPHAS observation. Good agreements were obtained. The numerical results for the tsunamis show the occurrence of strong refraction off the Noto Peninsula, which caused significant concentration of tsunami energy.<br />出版者照会後に全文を公開 続きを見る
4.

論文

論文
宮島, 昌克 ; 藤間, 功司 ; 庄司, 学 ; 鴫原, 良典
出版情報: 土木学会論文集A1(構造・地震工学)= JSCE Journal of Earthquake Engineering.  66  pp.371-376,  2010-01-01.  土木学会 = Japan Society of Civil Engineers
URL: http://hdl.handle.net/2297/36293
概要: The paper focuses on damage to lifeline facilities subjected to Tsunami. Tsunami will hit the wide areas between Kii pen insula and the coast of Shikoku if the Tohnankai and Tohkai Earthquakes happen. The precedents of damage to lifeline in the recent earthquakes do not exist because the large tsunami did not occur in the recent earthquakes around Japan. We firstly focus on the damage to lifeline facilities due to flood tide and high wave occurred in Japan and clarify the characteristics of the damage by flood. Then the damage caused by the 2009 South of Samoa Islands Earthquake and tsunami is investigated through reconnaissance work. Finally we study the characteristics of damage to lifeline facilities subjected to tsunami and its counter measures. 本論文は,津波によるライフライン被害について検討したものである。今世紀中ごろまでに東南海・南海地震が発生するのではないかと言われており,この地震により紀伊半島から四国沿岸に至る広範囲において津波が来襲することが危惧されている。まず,津波によるライフライン被害の特徴を過去の被害事例から明らかにする必要があるが,近年,日本国内で津波によりライフラインが被害を受けた事例はほとんど見当たらない。そこで,浸水被害という点では多くの共通点を有すると考えられる,日本国内における高波,高潮によるライフライン被害事例に着目して被害の特徴を明らかにした。さらに,2009年9月にサモア諸島南方沖を震源とする地震において津波被害を蒙った米領サモアのライフライン被害について現地調査結果を基に考察した。最後に,津波被害の特徴と対応策について考究した。 続きを見る
5.

論文

論文
林, 紀代美 ; 青木, 賢人
出版情報: 日本海域研究 = Japan sea research.  47  pp.91-104,  2016-03-22.  金沢大学環日本海域環境研究センター = Institute of Nature and Environmental Technology Kanazawa University
URL: http://hdl.handle.net/2297/45016
概要: In this study, the authors carried out a questionnaire survey of local residents living in coastal areas in Ishikawa Prefecture. The survey involved a discussion of the problems associated with tsunami disaster mitigation. The surveyed districts were Misaki District in Suzu City, Ogi and Ushizu Districts in Noto-cho, and Hashidate District in Kaga City. All of these districts are located along the coast and are expected to experience serious tsunami damage if a tsunami strikes. This expectation is based on assessments conducted by prefectural officials. The results of the questionnaire indicate that the level of readiness for a tsunami disaster by residents is related to their experiences of disaster evacuation drills. In the case of districts which have lots of experiences of disaster evacuation drills that are supported by local governments and local communities, many residents are adequately prepared for a disaster, its after-effects, and the recommended mitigation measures. Disaster readiness also differed according to age and gender. The findings also indicated that more needs to be done to support younger people and women. The four surveyed areas have similar physical features, but each district has different demographic characteristics. These results show that it is necessary to consider appropriate measures according to each district's population and the types of residents' properties. 続きを見る