Examination of changes and recovery processes of coastal landform after severe erosion by the 2011 Tohoku-oki Earthquake Tsunami, northeastern Japan

2015 Fiscal Year Final Research Report

• Project/Area Number: 25350419
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Geography
• Research Institution: Hirosaki University
• Principal Investigator: Koiwa Naoto 弘前大学, 教育学部, 教授 (70296002)
• Co-Investigator(Kenkyū-buntansha): ITO AKIFUMI 山形大学, 人文学部, 准教授 (40381149)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 地形変化 / 津波 / GPS / キネマティック測量 / 航空写真測量

Outline of Final Research Achievements

The 2011 Tohoku-oki Earthquake Tsunami altered coastal landforms. Reportedly, it caused remarkable coastal erosion. To elucidate the processes of recovery from the tsunami event, the authors have monitored coastal landform changes through interpretation of sequential topography maps based on measurements by high-resolution GPS in field surveys and aerial photogrammetry. Results of this study clarify that the coastal landforms of invested area have recovered approximately 60-80% in volume compared to the volume eroded by the tsunami, and the sediments for the recovery have been supplied from upstream of coastal drift.

Free Research Field

自然地理学