Research on vulnerability of the coastal lowland against tsunami in relation to the coastal landform environment

• Project/Area Number: 26350409
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Geography
• Research Institution: Nara University
• Principal Investigator: UMITSU Masatomo 奈良大学, 文学部, 教授 (50127883)
• Project Period (FY): 2014-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000); Fiscal Year 2016: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2015: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000); Fiscal Year 2014: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
• Keywords: 津波 / 海岸平野 / 海岸侵食 / 津波堆積物 / スマトラ島沖地震 / 東北地方太平洋沖地震 / アチェ / ナムケム / 東北地方太平洋岸海岸低地 / ナムケム平野 / 海岸地形 / 津波流動 / 海岸線変化 / 海岸低地 / インド洋大津波 / 東北地方太平洋沖地震津波 / 地形環境 / 海岸線の変化

Outline of Final Research Achievements

Distinct coastal change and wedge shaped coastal erosion occurred in northwestern Sumatra Island and the southern part of the Sendai Plain. Some of them are considered to be caused by the erosion of backwash flow. In the southern Sendai plain, ground elevation is higher and the backwash tsunami flow could easily concentrate to the linear lower parts in the plain. The concentrated flow caused erosion and formed wedge shaped inlets only in the southern part of the Sendai Plain. Change of tsunami deposits of the Namkhem coastal plain in southern Thailand during 2005 to 2017 was studied. Most of the area is still remaining as barren area with vegetation. Thickness of tsunami deposits in most sites is not extremely changed in these 10 years except in the place of depression where the concentration and accumulation of deposits are dominant. Color of the former top soil surface changed indistinct and facies of the tsunami deposits over the former surface also changed to obscure.

Research Products

• [Journal Article] Coastal erosion in the Lower Central Plain, Thailand (2017)
  • Author(s): Umitsu, M.
  • Journal Title: 奈良大地理 Volume: 22 Pages: 21-26
  • NAID: 40021610489
• [Journal Article] わが国における地形分類図の展開と課題 (2016)
  • Author(s): 海津正倫
  • Journal Title: 奈良大地理 Volume: 22 Pages: 1-9
  • NAID: 40020815372
• [Journal Article] Coastal landforms and 2004 Indian Ocean Tsunami inundation along the coast of northwestern Aceh province, Indonesia. (2015)
  • Author(s): Umitsu, M.
  • Journal Title: 奈良大地理 Volume: 21 Pages: 11-18
  • NAID: 40020503691
• [Presentation] タイ王国ナムケム平野におけるスマトラ島沖地震津波堆積物の約10年後の変化 (2018)
  • Author(s): 海津正倫・阿部朋弥・Naruekamon JANJIRAWUTTIKUL
  • Organizer: 日本地球惑星科学連合大会
• [Presentation] 防災に関わる沖積低地の地形分類の問題点と課題 (2017)
  • Author(s): 海津正倫
  • Organizer: 日本地理学会
  • Place of Presentation: 筑波大学（茨城県つくば市）
  • Year and Date: 2017-03-29
• [Presentation] タイ南西部沿岸における2004年インド洋大津波による津波堆積物の保存可能性 (2017)
  • Author(s): 阿部朋弥・海津正倫・Naruekamon JANJIRAWUTTIKUL
  • Organizer: 日本堆積学会
• [Presentation] 防災における土地条件と正しい地形用語の使用 (2016)
  • Author(s): 海津正倫
  • Organizer: 日本学術会議・防災学術連携体シンポジウム
  • Place of Presentation: 日本学術会議（東京都港区）
  • Year and Date: 2016-12-01
• [Presentation] 2004年スマトラ島沖地震で津波に覆われたタイ王国ナムケム平野の10年後における地形と堆積物の変化 (2016)
  • Author(s): 海津正倫・阿部朋弥・Janjirawuttikul Naruekamon
  • Organizer: 日本地形学連合
  • Place of Presentation: 明治大学（東京都千代田区）
  • Year and Date: 2016-10-09
• [Presentation] Tsunami inundation and coastal change in the coastal plains of the northwestern Sumatra Island, Indonesia and the Sendai and Ishinomaki coastal plains, Japan. (2015)
  • Author(s): Umitsu, M.
  • Organizer: International Conference of INQUA
  • Place of Presentation: 名古屋国際会議場（愛知県名古屋市）
  • Year and Date: 2015-07-29
  • Int'l Joint Research
• [Presentation] 日本列島における最終氷期以降の地形環境変動 (2015)
  • Author(s): 海津正倫
  • Organizer: 国際第四紀学連合第19回大会開催記念一般普及講演会
  • Place of Presentation: 名古屋大学（愛知県名古屋市）
  • Year and Date: 2015-07-25
  • Invited
• [Presentation] スマトラ島北部および東北地方太平洋岸の海岸平野における津波と地形との関係 (2014)
  • Author(s): 海津正倫
  • Organizer: 日本地形学連合
  • Place of Presentation: 奈良大学（奈良県奈良市）
  • Year and Date: 2014-10-11 – 2014-10-12
• [Presentation] 沖積低地の過去を知る -沖積低地と自然環境変化に関する一連の研究の背景- (2014)
  • Author(s): 海津正倫
  • Organizer: 日本第四紀学会
  • Place of Presentation: 名古屋大学（愛知県名古屋市）
  • Year and Date: 2014-06-07
  • Invited
• [Book] JAPAN AFTER 3/11 (2016)
  • Author(s): Umitsu, M. (coauthor)
  • Total Pages: 477
  • Publisher: University Press of Kentucky
• [Book] 微地形学 (2016)
  • Author(s): 海津正倫（分担執筆）
  • Total Pages: 358
  • Publisher: 古今書院