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Assessment of mangrove response to projected relative sea-level rise and recent historical reconstruction of shoreline position


Gilman, EL and Ellison, J and Coleman, R, Assessment of mangrove response to projected relative sea-level rise and recent historical reconstruction of shoreline position, Environmental Monitoring and Assessment, 124, (1-3) pp. 105-130. ISSN 0167-6369 (2007) [Refereed Article]

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Copyright 2007 Springer Science+Business Media B.V.

DOI: doi:10.1007/s10661-006-9212-y


We predict the decadal change in position of three American Samoa mangroves from analysis of a time series of remotely sensed imagery, a geographic information system, tide gauge data, and projections for change in sea-level relative to the mangrove surface. Accurate predictions of changes to coastal ecosystem boundaries, including in response to projected relative sea-level rise, enable advanced planning to minimize and offset anticipated losses and minimize social disruption and cost of reducing threats to coastal development and human safety. The observed mean landward migration of three mangroves' seaward margins over four decades was 25, 64, and 72 mm a−1, 12 to 37 times the observed relative sea-level rise rate. Two of the sites had clear trends in reductions in mangrove area, where there was a highly significant correlation between the change in position of the seaward mangrove margin and change in relative sea-level. Here it can be inferred that the force of sea-level rise relative to the mangrove surface is causing landward migration. Shoreline movement was variable at a third site and not significantly correlated with changing sea-level, where it is likely that forces other than change in relative sea-level are predominant. Currently, 16.5%, 23.4%, and 68.0% of the three mangroves' landward margins are obstructed by coastal development from natural landward migration. The three mangroves could experience as high as a 50.0% reduction in area by the year 2100. A 12% reduction in mangrove area by the year 2100 is possible in the Pacific islands region.

Item Details

Item Type:Refereed Article
Keywords:American Samoa, coastal erosion, mangrove, sea-level rise, wetland
Research Division:Engineering
Research Group:Other engineering
Research Field:Agricultural engineering
Objective Division:Environmental Management
Objective Group:Other environmental management
Objective Field:Other environmental management not elsewhere classified
UTAS Author:Gilman, EL (Dr Eric Gilman)
UTAS Author:Ellison, J (Associate Professor Joanna Ellison)
UTAS Author:Coleman, R (Professor Richard Coleman)
ID Code:42211
Year Published:2007 (online first 2006)
Web of Science® Times Cited:123
Deposited By:Geography and Environmental Studies
Deposited On:2006-08-01
Last Modified:2013-11-21
Downloads:3 View Download Statistics

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