Morphological characteristics of river mouths after the 2011 Tohoku Tsunami in Miyagi prefecture

Min Roh, Yuta Mitobe, Hitoshi Tanaka

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

Coastlines and river mouths along the Tohoku Region in Japan are in the process of steady recovery following the 2011 Tsunami. The affected sandy coastlines and river mouths have undergone more significant changes than the corresponding cliffs, rocky beaches, and hard structures. Analyses of aerial photographs and topographic data related to pre-tsunami and post-tsunami conditions together with the estimated minimum width and positioning changes of river mouths describe how they have changed as well as the differences in their recovery processes. In many cases, there is an indication of stable recovery although the behavioral tendency differs, as in the case of the Natori and Naruse rivers. This study shows that the temporal topographic changes and the relationship with the tidal prism in the mouths of these river mouths differ, resulting in different sediment deposition and restoration processes. Sediment supply is intricately associated with the morphological changes in river mouth morphological changes, which in turn reflect on its recovery. The morphological changes in a river’s mouth present practical river management and maintenance problems in ports and harbors; consequently, continuous monitoring is essential.

Original languageEnglish
Title of host publicationCoastal Research Library
PublisherSpringer
Pages137-152
Number of pages16
DOIs
Publication statusPublished - 2016 Jan 1

Publication series

NameCoastal Research Library
Volume14
ISSN (Print)2211-0577
ISSN (Electronic)2211-0585

Keywords

  • River morphology recovery
  • Tidal prism
  • Tohoku tsunami

ASJC Scopus subject areas

  • Oceanography
  • Management, Monitoring, Policy and Law
  • Nature and Landscape Conservation
  • Ecology

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  • Cite this

    Roh, M., Mitobe, Y., & Tanaka, H. (2016). Morphological characteristics of river mouths after the 2011 Tohoku Tsunami in Miyagi prefecture. In Coastal Research Library (pp. 137-152). (Coastal Research Library; Vol. 14). Springer. https://doi.org/10.1007/978-3-319-28528-3_10