Historical shoreline response to inlet modifications and sea level rise

Grant, Jonathan R. H. (1992) Historical shoreline response to inlet modifications and sea level rise. Gainesville, FL, University of Florida, Coastal and Oceanographic Engineering Department, (UFL/COEL, 92/008)

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Abstract

This thesis examines the historical shoreline response to inlet modifications and sea level rise. Inlet modifications are considered to be the geographic stabilization and training (through the use of structures) of natural inlets and the creation and further modification of artificial inlets. Shoreline response to natural and artificial processes must be understood in order to predict the performance of the coastline. The tendency for creating and modifying inlets increases as industry and population growth demands. Sea level rise is a natural process which cannot be controlled at this time. Current theoretical approaches to predicting shoreline response indicate that sea level rise and inlet modifications can cause substantial shoreline impact. Florida, with roughly a century of shoreline position and relative sea level data, provides a basis for examining past trends and comparing them with theory. The shoreline of Florida was found to be accreting with the greatest accretion along the east coast. Shoreline responses within the boundaries of the erosional influence of inlets due to their creation and/or modification were examined for 19 inlets around the coast of Florida. The differences in the shoreline response before and after the initial modification of each inlet show the erosional strain that inlets apply on the nearby shoreline. The effect on shoreline response due to the human intervention (unnatural processes) of modifying inlets was isolated and examined. The shoreline response due to this "human intervention" was erosional, thereby showing the negative impact that modified inlets have on shorelines. This induced erosion is responsible for the loss of roughly 21.6 million cubic yards of sand from the shoreline that is within the erosional influence of Florida's east coast inlets. Combining the shoreline changes due only to natural processes with sea level rise data allows for comparison with the commonly accepted Bruun Rule for shoreline response as a result of a changing sea level. This comparison and the effects of including a lag time between a rise in sea level and a change in shoreline along the east coast of Florida during the last century show no agreement with the Bruun Rule and no correlation with a specific lag time. (Document has 153 pages.)

Item Type: Monograph or Serial Issue
Title: Historical shoreline response to inlet modifications and sea level rise
Personal Creator/Author:
CreatorsEmail
Grant, Jonathan R. H.
Series Name: UFL/COEL
Number: 92/008
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
Uncontrolled Keywords: Coasts; Sea level changes; Coastal inlets; Florida
Subjects: Oceanography
Engineering
Earth Sciences
Item ID: 534
Depositing User: Stephanie Haas
Date Deposited: 05 Feb 2008 15:18
Last Modified: 29 Sep 2011 21:54
URI: http://aquaticcommons.org/id/eprint/534

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