Project of Resilient Coastal Levee in Sendai Bay South Coast Example of Ingenuity According to the Site Conditions in Idoura Area

Matsui, Shigehisa; Okuyama, Yoshinori; Ishikawa, Junichi; Shishido, Hirohumi; Kobayashi, Yutaka; Mizuno, Toshitake; Hara, Fumihiro; Jimbo, Masanobu

doi:10.2208/jscejoe.73.i_19

Cited by 4 publications

(1 citation statement)

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“…Furthermore, after the tsunami, both national and local governments have proposed numerous levels of protection, such as elevating roadways and railways, and constructing canals parallel to the beach to reduce the future tsunami energy and consequent damage. The first line of defense is the coastal embankment along the coastline [33]. This requires a thorough understanding of post-tsunami morphology change behaviors to ensure the sustainability of coastal morphology behavior and prevent the risk of coastal erosion.…”

Section: Field Sitementioning

confidence: 99%

Morphology Recovery and Convergence of Topographic Evolution in the Natori River Mouth after the 2011 Tohoku Tsunami

Hiep¹,

Tanaka²,

Tinh³

2022

Water

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The 2011 Great East Japan earthquake and tsunami caused significant damage along the coastal region in Miyagi Prefecture. In the Natori River of Miyagi Prefecture, the recovery process of the estuarine morphology has been observed since the tsunami arrived. In this study, detailed analyses of collected aerial photographs and beach topography in front of the river mouth were conducted to evaluate whether the river mouth has reached a new equilibrium. The shoreline analysis suggests that the river mouth has obtained an equilibrium state after 2014 in which the sediment volume can be preserved within the littoral system. In addition, the convergence process to the stable topography was detected by the first spatial and temporal eigenfunctions obtained from the empirical orthogonal function (EOF) analysis of the beach profiles. From the results, it can be concluded that the river mouth has obtained a new equilibrium of morphology after the tsunami. As the recurrence of the tsunami can be expected in the next several centuries, the findings of this study can be useful for long-term coastal and riverine management against future disasters in this river mouth, and other coastal regions that are prone to large-scale disasters in the near future.

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Section: Field Sitementioning

confidence: 99%