Impact of the 2011 tsunami on the littoral system around offshore breakwaters on Sendai Coast
Impact of the 2011 tsunami on the littoral system around offshore breakwaters on Sendai Coast
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2011 年海啸对仙台海岸近海防波堤周围沿岸系统的影响
DOI：
10.1201/9781315375045-42
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
A. Mori
中科院分区：
文献类型：
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作者：
H. Tanaka;Yuko Mitobe;A. Mori
2011年东日本大地震海啸发生后，仙台海岸的沿岸的系统由于海啸引起沿着海岸高度非平衡状态而发生了变化。为了阐明仙台海岸沿岸的环境的改变及其随后的恢复，对海岸线变化进行了分析。本研究从2009年至今频繁拍摄的航空照片中提取海岸线，并使用经验正交函数（Empirical Orthogonal Function，简写为ERF）方法进行分析。可以看出，由于海啸事件，海岸线大幅后退。特别是，存在于离岸防波堤后面的连岛由于海啸而完全消失。第一、二组分的贡献率之和大于70%。结果表明，第一分量来源于近岸泥沙运动，而第二分量代表沿岸泥沙输运。虽然第一个组成部分，海啸后只有轻微的修改，第二个组成部分，从沿岸沉积物输运后，海啸周围的离岸防波堤显示出明显的变化。
After the 2011 Great East Japan Earthquake Tsunami, littoral system on Sendai Coast have been changing due to tsunami-induced highly non-equilibrium condition along the coast. In order to clarify the modification of littoral environment and its subsequent recovery on Sendai Coast, analysis of shoreline change has been carried out. In this study, the shoreline was extracted from frequently captured aerial photographs from 2009 until now, and analysis using an empirical orthogonal function (EOF) method was conducted. It is seen that the shoreline retreated greatly due to tsunami event. In particular, tombolo which existed behind the offshore breakwater completely disappeared due to the tsunami. Total of contribution of the 1st and 2nd EOF components is more than 70%. It is concluded that the 1st component originated from cross-shore sediment movement, while the 2nd component represents longshore sediment transport. Although the 1st component shows only slight modification after the tsunami, the 2nd component resulting from a longshore sediment transport shows distinct change after the tsunami around the offshore breakwaters.
仙台海岸海岸线变化的经验特征函数法分析
DOI：
--
发表时间：
2002
期刊：
Proceedings of 13^<th> APD-IAHR Congress
影响因子：
--
作者：
Tanaka;H.;Nagasawa;T.
通讯作者：
T.