Barrier island erosion and overwash study - volume 1

Srinivas, R. and Dean, Robert G and Parchure, T. M. (1992) Barrier island erosion and overwash study - volume 1. Gainesville, FL, University of Florida, Coastal and Oceanographic Engineering Department, (UFL/COEL, 92/010)

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This is the first of a pair of reports documenting the effects of storms on barrier island systems. The present report (Volume 1) investigates storm effects on natural island conditions whereas Volume 2 addresses the effects of seawalls. With the aim of simulating the effects of overwash on barrier islands and characterizing their response, a series of nine experiments was conducted at the Coastal Engineering Laboratory of the University of Florida. The barrier island was simulated by a 400 feet wide (prototype units) horizontal crest and an initially planar (1:19) beach. The effects of various storm surge levels and accompanying overtopping were investigated. Experiments were conducted with both regular and irregular storm waves. Regular waves without overtopping caused the formation of a substantial berm in the swash zone and a prominent longshore bar offshore. Increasing degrees of overtopping resulted in substantial loss of sand from the barrier island system. The longshore bar was considerably more subtle for the highest water level tested (11.5 ft. above mean sea level). Simulation of a storm-surge hydrograph with rising and falling water levels indicated that the presence of the bar tends to occur only during a relatively steady or slowly changing water level. The experiments with irregular waves were conducted with reasonably similar wave heights and carrier periods as those with regular waves. The major difference was in the characteristics of the longshore bar response. In comparison with cases with regular waves, the bar was less distinct without overtopping, subtle with minimal overtopping and absent in cases with substantial overtopping. These experiments seem to indicate that offshore bars are simply break-point bars which require a fairly steady break-point and undertow (return of mass transport) for optimal formation. (Document has 84 pages.)

Item Type: Monograph or Serial Issue
Title: Barrier island erosion and overwash study - volume 1
Personal Creator/Author:
Srinivas, R.
Dean, Robert G
Parchure, T. M.
Series Name: UFL/COEL
Number: 92/010
Date: 1992
Publisher: University of Florida, Coastal and Oceanographic Engineering Department
Place of Publication: Gainesville, FL
Department: Department of Civil and Coastal Engineering
Funders: Department of Civil and Coastal Engineering, University of Florida
Institution: University of Florida
Additional Information: Prepared for: Beaches and Shores Resource Center Innovation Park, Morgan Building Box 9 2035 East Paul Dirac Drive Tallahassee, Fl 32304
Uncontrolled Keywords: Barrier Island; Storm Effects; Beach Erosion; Overwash; Washover
Subjects: Oceanography
Earth Sciences
Item ID: 536
Depositing User: Stephanie Haas
Date Deposited: 17 Jan 2008 13:11
Last Modified: 29 Sep 2011 21:50

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