Geomorphic imprints of repeated tsunami waves in a coastal valley in northeastern Japan

Yuichi S. Hayakawa; Takashi Oguchi; Hitoshi Saito; Akitoshi Kobayashi; Victor R. Baker; Jon D. Pelletier; Luke A. McGuire; Goro Komatsu; Kazuhisa Goto

doi:10.1016/j.geomorph.2015.02.034

Geomorphic imprints of repeated tsunami waves in a coastal valley in northeastern Japan

Yuichi S. Hayakawa, Takashi Oguchi, Hitoshi Saito, Akitoshi Kobayashi, Victor R. Baker, Jon D. Pelletier, Luke A. McGuire, Goro Komatsu, Kazuhisa Goto

Research output: Contribution to journal › Article › peer-review

9 Scopus citations

Abstract

Devastating tsunami waves induced by the 2011 off the Pacific coast of Tohoku Earthquake severely inundated valleys along the ria-type (notched rocky) coast in northeastern Japan, causing erosion of bedrock on valley-side slopes. Using high-resolution topographic data obtained by terrestrial and airborne laser scanning, we investigated detailed morphology of the eroded valley in a typical site at Aneyoshi. We found several characteristic features likely affected by tsunami wave erosion: 1) a series of small cliffs on the valley-side slopes related to the tsunami flow depth, 2) an inverse asymmetry of side slopes at ingrown meander bends, 3) an exceptionally wide valley bottom near the coast, and 4) a knickpoint located around the maximum tsunami run-up point far back from the coast. These topographic features are ascribable to repeated tsunami wave erosion since the mid-Holocene.

Original language	English (US)
Pages (from-to)	3-10
Number of pages	8
Journal	Geomorphology
Volume	242
DOIs	https://doi.org/10.1016/j.geomorph.2015.02.034
State	Published - Aug 1 2015

Keywords

Bedrock erosion
Cliff
Knickpoint
Meander
Terrestrial laser scanning
Tsunami

ASJC Scopus subject areas

Earth-Surface Processes

Access to Document

10.1016/j.geomorph.2015.02.034

Cite this

@article{e9ebff459a1d4a01b27acbe195fca940,

title = "Geomorphic imprints of repeated tsunami waves in a coastal valley in northeastern Japan",

abstract = "Devastating tsunami waves induced by the 2011 off the Pacific coast of Tohoku Earthquake severely inundated valleys along the ria-type (notched rocky) coast in northeastern Japan, causing erosion of bedrock on valley-side slopes. Using high-resolution topographic data obtained by terrestrial and airborne laser scanning, we investigated detailed morphology of the eroded valley in a typical site at Aneyoshi. We found several characteristic features likely affected by tsunami wave erosion: 1) a series of small cliffs on the valley-side slopes related to the tsunami flow depth, 2) an inverse asymmetry of side slopes at ingrown meander bends, 3) an exceptionally wide valley bottom near the coast, and 4) a knickpoint located around the maximum tsunami run-up point far back from the coast. These topographic features are ascribable to repeated tsunami wave erosion since the mid-Holocene.",

keywords = "Bedrock erosion, Cliff, Knickpoint, Meander, Terrestrial laser scanning, Tsunami",

author = "Hayakawa, {Yuichi S.} and Takashi Oguchi and Hitoshi Saito and Akitoshi Kobayashi and Baker, {Victor R.} and Pelletier, {Jon D.} and McGuire, {Luke A.} and Goro Komatsu and Kazuhisa Goto",

note = "Publisher Copyright: {\textcopyright} 2015 Elsevier B.V.",

year = "2015",

month = aug,

day = "1",

doi = "10.1016/j.geomorph.2015.02.034",

language = "English (US)",

volume = "242",

pages = "3--10",

journal = "Geomorphology",

issn = "0169-555X",

publisher = "Elsevier B.V.",

}

TY - JOUR

T1 - Geomorphic imprints of repeated tsunami waves in a coastal valley in northeastern Japan

AU - Hayakawa, Yuichi S.

AU - Oguchi, Takashi

AU - Saito, Hitoshi

AU - Kobayashi, Akitoshi

AU - Baker, Victor R.

AU - Pelletier, Jon D.

AU - McGuire, Luke A.

AU - Komatsu, Goro

AU - Goto, Kazuhisa

PY - 2015/8/1

Y1 - 2015/8/1

N2 - Devastating tsunami waves induced by the 2011 off the Pacific coast of Tohoku Earthquake severely inundated valleys along the ria-type (notched rocky) coast in northeastern Japan, causing erosion of bedrock on valley-side slopes. Using high-resolution topographic data obtained by terrestrial and airborne laser scanning, we investigated detailed morphology of the eroded valley in a typical site at Aneyoshi. We found several characteristic features likely affected by tsunami wave erosion: 1) a series of small cliffs on the valley-side slopes related to the tsunami flow depth, 2) an inverse asymmetry of side slopes at ingrown meander bends, 3) an exceptionally wide valley bottom near the coast, and 4) a knickpoint located around the maximum tsunami run-up point far back from the coast. These topographic features are ascribable to repeated tsunami wave erosion since the mid-Holocene.

AB - Devastating tsunami waves induced by the 2011 off the Pacific coast of Tohoku Earthquake severely inundated valleys along the ria-type (notched rocky) coast in northeastern Japan, causing erosion of bedrock on valley-side slopes. Using high-resolution topographic data obtained by terrestrial and airborne laser scanning, we investigated detailed morphology of the eroded valley in a typical site at Aneyoshi. We found several characteristic features likely affected by tsunami wave erosion: 1) a series of small cliffs on the valley-side slopes related to the tsunami flow depth, 2) an inverse asymmetry of side slopes at ingrown meander bends, 3) an exceptionally wide valley bottom near the coast, and 4) a knickpoint located around the maximum tsunami run-up point far back from the coast. These topographic features are ascribable to repeated tsunami wave erosion since the mid-Holocene.

KW - Bedrock erosion

KW - Cliff

KW - Knickpoint

KW - Meander

KW - Terrestrial laser scanning

KW - Tsunami

UR - http://www.scopus.com/inward/record.url?scp=84930277429&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84930277429&partnerID=8YFLogxK

U2 - 10.1016/j.geomorph.2015.02.034

DO - 10.1016/j.geomorph.2015.02.034

M3 - Article

AN - SCOPUS:84930277429

SN - 0169-555X

VL - 242

SP - 3

EP - 10

JO - Geomorphology

JF - Geomorphology

ER -

Geomorphic imprints of repeated tsunami waves in a coastal valley in northeastern Japan

Abstract

Keywords

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this