Barrier island erosion and overwash study -- effect of seawalls. Volume 2

Srinivas, R. and Dean, Robert G. and Parchure, T. M. (1992) Barrier island erosion and overwash study -- effect of seawalls. Volume 2. Gainesville, FL, University of Florida, Coastal and Oceanographic Engineering Department, (UFL/COEL) (92/011).

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This is the second of a pair of reports documenting the effects of storms on beach systems including the presence of seawalls. With the aim of simulating the effects of overwash on barrier islands with seawalls and characterizing their response, a series of eight experiments was conducted at the Coastal Engineering Laboratory of the University of Florida. The barrier island was simulated by a 400 feet wide horizontal crest and an initially uniform mildly-sloped (1:19) beach. The effects of positioning the seawall at two different locations as well as the effects of various storm surge levels and accompanying overtopping were investigated. Experiments were conducted with both regular and irregular storm waves. With the seawall located at the slope break between the crest and the sloping beach of the barrier island, and the crest of the seawall just submerged in sand, the effects on the sediment transport process were found to be minimal. For the same position of the seawall but with the crest of the seawall raised above the surrounding ground level, overtopping caused washover of sand indicating substantial transport in suspension. Increased levels of overtopping tended to accentuate bed profile changes but supress bar formation (as did irregular waves). Positioning the seawall at the Mean Sea Level shoreline caused significant scour both immediately landward as well as immediately seaward of the seawall. A prominent scour trough developed further seaward. The longshore bar was highly three-dimensional. It appears that seawalls need to be located adequately landward of the shoreline to discharge their function effectively without adverse effect to the beach. In addition, concerns for safety warrant the presence of an adequate buffer-zone between the seawall and the upland property. (61 pp.)

Item Type: Monograph or Serial Issue
Title: Barrier island erosion and overwash study -- effect of seawalls. Volume 2
Personal Creator/Author:
Srinivas, R.
Dean, Robert G.
Parchure, T. M.
Series Name: UFL/COEL
Date: 1992
Publisher: University of Florida, Coastal and Oceanographic Engineering Department
Place of Publication: Gainesville, FL
Department: Department of Civil and Coastal Engineering
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; seawalls; storm effects; beach erosion; overwash
Subjects: Oceanography
Earth Sciences
Item ID: 541
Depositing User: Stephanie Haas
Date Deposited: 25 Jan 2008 14:42
Last Modified: 29 Sep 2011 21:51

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