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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| | ||
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Vicksburg, MS 39180-6199 | Vicksburg, MS 39180-6199 | ||
</p>| | </p>| | ||
abstract= | 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/> | 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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