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  • 富田 孝史, 田口 聖也, 中西 祥一, 千田 優, 水谷 法美
    土木学会論文集B2(海岸工学)
    2020年 76 巻 2 号 I_307-I_312
    発行日: 2020年
    公開日: 2020/11/04
    ジャーナル フリー

     津波災害の際には,津波によって漂流した自動車,コンテナ等が道路や航路をふさぐことによって緊急物資輸送等を支障して救援・復旧・復興に悪影響を及ぼす.津波漂流物の流動挙動の推定技術の向上に資するため,本研究では,陸上に配置された直方体の漂流物模型を津波によって流動させる水理模型実験を実施し,漂流物の個数および初期角度が漂流物の流動に及ぼす影響を明らかにした.複数の漂流物模型が模型幅の等倍程度に近接する場合には相互干渉が発生し,模型単体とは異なる流動挙動を示した.また,遡上波の流れに対して斜めの模型には揚力の作用によって流れに直交する方向の運動成分が生じた.複数の模型の重心位置の移動には,模型の相互干渉の影響が生じ,流れに沿った模型の列数が多いほど移動距離が短くなった.

  • 丸山 喜久, 松崎 志津子, 山崎 文雄, 三浦 弘之, ESTRADA Miguel
    土木学会論文集A1(構造・地震工学)
    2010年 66 巻 1 号 377-385
    発行日: 2010年
    公開日: 2011/04/30
    ジャーナル フリー
    筆者らは,地球規模課題対応国際科学技術協力事業「ペルーにおける地震・津波減災技術の向上に関する研究」の一環としてJSTからの援助を受け,2010年2月27日に発生したチリ地震の被害調査を実施した.調査は地震から約1ヶ月後の4月2~8日にかけて実施した.本論では被害調査の概要と調査結果および地理情報システム(GIS)を用いた分析を行い地震,津波被害の特徴について述べる.具体的には,被災地域における衛星画像と現地調査写真を比較し,地震による建物被害がどの程度把握できるか検討を行う.また,標高データ(DEM)を利用し,津波被害が生じている地域の地形的特徴を分析する.
  • 辰巳 大介, 富田 孝史
    土木学会論文集B3(海洋開発)
    2011年 67 巻 2 号 I_535-I_540
    発行日: 2011年
    公開日: 2011/12/08
    ジャーナル フリー
     本研究は,GPS波浪計・DARTブイ・チリ沿岸の検潮所が観測した津波波形を利用して,インバージョン手法により2010年チリ地震津波の津波波源を推定することを目的とする。地震波の逆推定に基づく津波波源を使用した津波数値計算では,GPS波浪計・DARTブイ・震央の北側の検潮所において計算結果が観測値よりも早く到達し,震央の南側の検潮所において計算結果が観測値よりも遅く到達する,という課題が見られた。本研究が津波観測波形から推定した津波波源は,地震波の逆推定に基づく津波波源よりも南米大陸側に寄り,また南側に寄った。この結果,津波観測波形の逆推定に基づく津波波源を使用した津波数値計算では,計算結果と観測波形の一致度が向上した。
  • ニューイングランドにおける捕鯨マニュファクチュアの考察
    大崎 晃
    地学雑誌
    2005年 114 巻 4 号 561-578
    発行日: 2005/12/25
    公開日: 2009/11/12
    ジャーナル フリー
    The writer contributed to “Journal of Geography 2000” Vol.109 on whaling by sailing vessels in the 19th century. Here, the writer studied details the management of whaling voyages at that time.
    Whaling voyages extended from one year to two, threes, and four years. This necessitated whaling vessels calling at several ports en route for supplies of water, firewood and food. Hakodate in Japan, which was already open to foreign vessels, was one of the ports of call. Whale oil and whalebone harvested during a voyage were sent by cargo clippers to the respective home ports in New England, via supply ports centering on Honolulu in the Sandwich Isis. The purpose was to empty the hold and quickly cash in the cargo.
    The places of birth of crews were New England and other areas in the USA, but they actually lived around their home ports and had us citizenship. Some of crew members died due to various accidents, or left their vessels because of illness. In addition, in the Pacific, a number of unskilled hands deserted their vessels at some islands of call. Therefore, the vacancies had to be filled at port of calls. As a result, many crews changed composition from the time of departure.
    The lay-system was contracted at the port of departure. Dividends based on percentage of proceeds of whale oil and whalebone were paid to crews upon return to port. This lay-system was adopted by American whaling, but there were great differences in dividends received by skilled and unskilled hands. In addition, in the case of unskilled hands, dividend account was greatly reduced by advance money and interest before and during the sailing. Therefore, their net income was very small.
    Untill the 1850s, whaling prospered and proceeds from whale oil and whalebone were large.
    Naturally, dividends for investors were large. Therefore, shipbuilding casts were easily covered by around 2 voyages. But, in the 1870s when American whaling declined as proceeds from whale oil and whalebone were reduced by the lay-system, both dividends for investors and crews also decreased, although whaling as an enterprise was still carried on. But, interest in whaling of both investors and crews was receding. In the 1870s the number of American crews decreased, and foreign crews including skilled hands increased. Many extra hands also had to be hired.
    In the history of economics American whaling by sailing vessels in the 19th century can be considered to be at the manufacturing stage. Theory explained that manufacturing develops into a capitalist industry through the Industrial Revolution or mechanization. However, American whaling by sailing vessels did not follow this course. It can be considered that both investors and crews (capital and labor) moved out of the whaling industry to other sectors in the latter part of the 19th century as whale resource decreased. The whale oil market price fell due to competition from petroleum. Moreover, at this time in New England there were large investments in various industries, and the labor market on land was expanding. This is in contrast to the Japanese case in which a manufacturing scale fishery developed into capitalist stage fishery with a limited investment area and a small labor market. The writer would like to pursue this subject.
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