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{{ReportDoc| | {{ReportDoc| | ||
repdate=September 2009| | repdate=September 2009| | ||
reptype=Final report| | reptype=Final report| | ||
title=Barrier Island Migration Over a Consolidating Substrate| | title=Barrier Island Migration Over a Consolidating Substrate| | ||
authors=Julie Dean Rosati| | authors=Julie Dean Rosati| | ||
repnumber=ERDC/CHL TR-09-8| | repnumber=ERDC/CHL TR-09-8| | ||
sponsor=| | sponsor= | ||
<p> | |||
U.S. Army Engineer Research and Development Center<br> | |||
Coastal and Hydraulics Laboratory<br> | |||
3909 Halls Ferry Road<br> | |||
Vicksburg, MS 39180-6199 | |||
</p>| | |||
abstract= | |||
Barrier islands that overlie a compressible substrate load and consolidate the underlying | |||
subsurface. Through time, the elevation and aerial extent of these islands are reduced, | |||
making them more susceptible to inundation and overwash. Sand washed over the island and | |||
onto back-barrier marsh or into the bay or estuary begins the consolidation process on | |||
a previously non-loaded substrate, with time-dependent consolidation a function of the | |||
magnitude of the load, duration of load, and characteristics of the substrate. | |||
The result is an increase in the overwash, migration, breaching, and segmentation | |||
of these islands.<br/> | |||
This research determined the degree to which consolidation affects the evolution of barrier | |||
island systems overlying a poorly consolidated substrate, both for natural islands and | |||
those that have been restored with an infusion of sand from an external source. A | |||
two-dimensional (cross-shore) mathematical model was developed, tested with field data, | |||
and then applied to evaluate how a compressible substrate modifies long-term barrier | |||
island evolution. The model spans time durations of years to decades and represents | |||
cross-shore evolution of a sandy barrier island due to erosion, runup, overwash, | |||
migration, and time-dependent consolidation of the underlying substrate due to | |||
loading by the island.| | |||
subjectterms1=Barrier island migration| | |||
subjectterms2=Numerical modeling | |||
Storm reponse | |||
Deltaic coasts| | |||
subjectterms3=Consolidation | |||
Beach Nourishment | |||
Beach fill| | |||
numpages=218| | |||
}} | }} | ||
Latest revision as of 18:36, 22 October 2010
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