Coupled topographic and vegetation patterns in coastal dunes: Remote sensing observations and ecomorphodynamic implications


Journal Article

©2016. American Geophysical Union. All Rights Reserved. Vegetation plays a key role in stabilizing coastal dunes and barrier islands by mediating sand transport, deposition, and erosion. Dune topography, in turn, affects vegetation growth, by determining local environmental conditions. However, our understanding of vegetation and dune topography as coupled and spatially extensive dynamical systems is limited. Here we develop and use remote sensing analyses to quantitatively characterize coastal dune ecotopographic patterns by simultaneously identifying the spatial distribution of topographic elevation and vegetation biomass. Lidar-derived leaf area index and hyperspectral-derived normalized difference vegetation index patterns yield vegetation distributions at the whole-system scale which are in agreement with each other and with field observations. Lidar-derived concurrent quantifications of biomass and topography show that plants more favorably develop on the landward side of the foredune crest and that the foredune crestline marks the position of an ecotone, which is interpreted as the result of a sheltering effect sharply changing local environmental conditions. We conclude that the position of the foredune crestline is a chief ecomorphodynamic feature resulting from the two-way interaction between vegetation and topography.

Full Text

Duke Authors

Cited Authors

  • Yousefi Lalimi, F; Silvestri, S; Moore, LJ; Marani, M

Published Date

  • January 1, 2017

Published In

Volume / Issue

  • 122 / 1

Start / End Page

  • 119 - 130

Electronic International Standard Serial Number (EISSN)

  • 2169-8961

International Standard Serial Number (ISSN)

  • 2169-8953

Digital Object Identifier (DOI)

  • 10.1002/2016JG003540

Citation Source

  • Scopus