Terrestrial laser scanning of anthropogenic beach berm erosion and overtopping

TitleTerrestrial laser scanning of anthropogenic beach berm erosion and overtopping
Publication TypeJournal Article
Year of Publication2015
AuthorsSchubert J.E, Gallien T.W, Majd M.S, Sanders B.E
JournalJournal of Coastal Research
Volume31
Pagination47-60
Date Published2015/01
Type of ArticleArticle
ISBN Number0749-0208
Accession NumberWOS:000347868900005
Keywordscoastal; Coastal flooding; extremes; flood prediction; forecasts; integrated analysis; inundation; LiDAR; natural beach; Sea level rise; sea-level rise; swash zone; system; Urban flooding
Abstract

Anthropogenic berms are widely deployed to manage coastal flooding. The dynamic erosion of scraped berms exposed to waves and a rising tide in southern California was monitored with a terrestrial laser scanner (TLS) on three occasions in February and March of 2012. An improved characterization of initial berm geometry and the dynamics of berm erosion was pursued to accurately predict the onset and impact of coastal flooding associated with berm erosion and overtopping. TLS is shown to yield a digital terrain model (DTM) with a vertical accuracy of ca. 3 cm, indicating it is an excellent source of data for initializing mechanistic and/or empirical models that could be used to predict the onset and rate of wave overtopping. Minimum scan point spacings required to achieve this level of accuracy are investigated and reported. Additionally, a dimensionless water level representing the fractional submergence of the berm is identified as a good predictor of cumulative berm erosion under the test conditions.

DOI10.2112/jcoastres-d-14-00037.1
Short TitleJ. Coast. Res.
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