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PORTAIL D'INFORMATION GÉOGRAPHIQUE

Evaluating proxies for estimating subaerial beach volume change across increasing time scales and various morphologies

Auteur(s) et Affiliation(s)

THEUERKAUF, E.J.
Inst. of Marine Sciences, Univ. of North Carolina at Chapel Hill, Morehead City, Etats-Unis
RODRIGUEZ, A.B.
Inst. of Marine Sciences, Univ. of North Carolina at Chapel Hill, Morehead City, Etats-Unis


Description :
This study assesses the impacts of morphologic variations, associated with beach cusps and nourishment material, on volume change estimates from profiles and shoreline change at 0.5 to 3.5 year time periods. Volume changes at the edges of nourishment areas are not captured well by profiles. When the nourishment material is graded to a ramped morphology, which minimizes across-beach morphologic variability, the shoreline-change proxy does accurately estimate volume changes. Both proxies estimate volume changes inaccurately at beaches where volume changes oscillate between erosion and accretion on both short and long time scales because the magnitude of small-scale changes in volume from the formation and erosion of morphologic features, such as cusps and berms, will always be similar to the longer-term net volume change. This study suggests that decadal records of shoreline change, which are commonly developed using aerial photography, can be used to help identify the best proxy for estimating volume change; however, recent anthropogenic modifications that impact patterns of beach sedimentation, including nourishment, terminal groins, and inlet-channel dredging, makes decadal records less useful.


Type de document :
Article de périodique

Source :
Earth surface processes and landforms, issn : 0197-9337, 2014, vol. 39, n°. 5, p. 593-604, nombre de pages : 12, Références bibliographiques : 1 p.

Date :
2014

Editeur :
Pays édition : Royaume-Uni, Chichester, Wiley

Langue :
Anglais
Droits :
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