reference : Beach erosion under rising sea-level modulated by coastal geomorphology and sediment availability on carbonate reef-fringed island coasts

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/reference/1265f11e-9557-485e-8e43-f24c6e1720b8
Bibliographic fields
reftype Journal Article
Abstract This study addresses gaps in understanding the relative roles of sea-level change, coastal geomorphology and sediment availability in driving beach erosion at the scale of individual beaches. Patterns of historical shoreline change for spatial relationships to geomorphology and for temporal relationships to late-Holocene and modern sea-level change are examined. The study area shoreline on the north-east coast of Oahu, Hawaii, is characterized by a series of kilometres-long beaches with repeated headland-embayed morphology fronted by a carbonate fringing reef. The beaches are the seaward edge of a carbonate sand-rich coastal strand plain, a common morphological setting in tectonically-stable tropical island coasts. Multiple lines of geological evidence indicate that the strand plain prograded atop a fringing reef platform during a period of late Holocene sea-level fall. Analysis of historical shoreline changes indicates an overall trend of erosion (shoreline recession) along headland sections of beach and an overall trend of stable to accreting beaches along adjoining embayed sections. Eighty eight percent of headland beaches eroded over the past century at an average rate of -0.12 ± 0.03 m/yr. In contrast, 56% of embayed beaches accreted at an average rate of 0.04 ± 0.03 m/yr. Given over a century of global (and local) sea-level rise, the data indicates that embayed beaches are showing remarkable resiliency. The pattern of headland beach erosion and stable to accreting embayments suggests a shift from accretion to erosion particular to the headland beaches with the initiation of modern sea-level rise. These results emphasize the need to account for localized variations in beach erosion related to geomorphology and alongshore sediment transport in attempting to forecast future shoreline change under increasing sea-level rise. This article is protected by copyright. All rights reserved.
Author Romine, Bradley M.; Fletcher, Charles H.; Frazer, L. Neil; Anderson, Tiffany R.
DOI 10.1111/sed.12264
Database Provider Wiley Online Library
Date 2016/01/01/
ISSN 1365-3091
Issue 5
Journal Sedimentology
Keywords Hawaii; Sea level; Oahu; Adaptation; coastal; sea-level; erosion; Beach; shoreline
Language en
Pages 1321-1332
Title Beach erosion under rising sea-level modulated by coastal geomorphology and sediment availability on carbonate reef-fringed island coasts
Volume 63
Year 2016
Bibliographic identifiers
_record_number 22507
_uuid 1265f11e-9557-485e-8e43-f24c6e1720b8