Morphological Changes Along the Ishinomaki Coast Induced by the 2011 Great East Japan Tsunami and the Relationship with Coastal Structures
Morphological Changes Along the Ishinomaki Coast Induced by the 2011 Great East Japan Tsunami and the Relationship with Coastal Structures
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2011年东日本大海啸引起的石卷海岸形态变化及其与海岸结构的关系
DOI：
10.1142/s0578563414500168
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发表时间：
2014
影响因子：
2.4
通讯作者：
K. Udo
中科院分区：
文献类型：
--
作者：
M. Adityawan;N. X. Dao;Hitoshi Tanaka;A. Mano;K. Udo
2011年东日本大地震和海啸对受影响的沿海地区造成了严重破坏。本研究基于2011年地震前后测量的测深数据，分析了石卷海岸的海底沉降和形态变化。总的来说，海底沉降在0.32 ~ 0.91 m之间。此外，2011年海啸对海底造成的大规模侵蚀发生在当地，在成濑河口前和石卷海岸的西端。此外，海啸在这些地区造成的封闭深度比其他地区高。河口前沙口被严重侵蚀，西端抛石防护被完全破坏。因此，在海啸期间，这些地区没有缓冲。因此，海啸引起的床应力更高，可能发生在更深的地区。其他地区受到相对完好的混凝土结构的保护，没有遭受严重的侵蚀。这表明，在海啸期间，海岸防护结构既保护了陆地，也保护了向海一侧。
The 2011 Great East Japan Earthquake and Tsunami caused severe damage along the affected coastal area. This study analyzed seabed subsidence and morphological changes along the Ishinomaki Coast based on bathymetry measured shortly before and after the 2011 event. In general, seabed subsidence ranged from 0.32 m to 0.91 m. In addition, massive erosion on the seabed due to the 2011 tsunami occurred locally, in front of the Naruse River mouth and at the west end of the Ishinomaki Coast. Moreover, the depth of closure generated by the tsunami in these areas was higher than in others. The sandspit in front of the river mouth was severely eroded and the riprap protection at the west end was completely destroyed. Thus, there were no buffers in these areas during the tsunami. Therefore, tsunami-induced bed stresses were higher and may have occurred in deeper areas. Other areas, which were protected by relatively unharmed concrete structures, did not suffer from severe erosions. This suggests that the coastal protection structures protected both the land and the seaward side during the tsunami.