Tidal flood water withdrawal, with special reference to Jupiter Inlet, Florida (M.S.Engineering Thesis)

DelCharco, Michael James (1992) Tidal flood water withdrawal, with special reference to Jupiter Inlet, Florida (M.S.Engineering Thesis). Gainesville, FL, University of Florida. Department of Coastal and Oceanographic Engineering, (UFL/COEL, 92/003)

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Abstract

The focus of this study was the flow patterns of a flood tide near an inlet. The objectives were to examine flood flow patterns with particular reference to non-uniform or selective withdrawal as influenced by bottom topography and longshore currents, and to test the applicability of conceptually simple analytic solutions to realistic sandy inlet bottom topographies, which often include an ebb shoal. Specifically, the applicability of three analytic solutions, two of which include offshore selective withdrawal, to modeling of tidal water withdrawal during flood tide under variable bottom topography and varying ratios of longshore current to inlet velocity, was examined. The three analytic solutions, including those for a horizontal (flat) bottom, a linearly sloping bottom and a logarithmically sloping bottom, together with a uniform longshore current, were derived using potential flow theory. These solutions exhibit uniformly distributed flows, selective offshore withdrawal, or an exaggerated offshore withdrawal, respectively, depending on the bottom slope. In order to investigate the flow patterns that exist during flood flow at a real inlet, experiments were conducted in a fixed bed hydrodynamic model of Jupiter Inlet, Florida. Measurements were made to determine streamlines and velocities. A field study at the prototype also tracked drogue patterns to determine streamlines and velocities. The physical model tests compared well with the field data. Comparison of the laboratory and field data was then made to the analytic solutions to determine whether the topography at Jupiter Inlet, which includes a well-developed ebb shoal, simulates a flat, mean linearly or logarithmically sloping bottom. By comparing velocities at six selected points, a significant relationship between the physical model and field data to the flat bottom analytic solution was evident. The physical model tests and field data suggested that the flood tidal prism was drawn from the region predominantly shoreward of the ebb shoal, thus implying a nearshore selective withdrawal. Because the flood tidal prism was drawn from the nearshore, the flow patterns at Jupiter Inlet did not resemble the analytic solutions of a linearly or logarithmically sloping bottom, even though over a relatively long distance offshore, the bottom topography does slope offshore at this inlet. In general, different inlet topographies would lend themselves to different analytic solutions, two examples being 1) the linearly sloping bottom of Koombana Bay Inlet, Australia, which shows an offshore selective withdrawal and 2) the basin-like nearfield topography of Jupiter Inlet which shows a more uniform nearshore withdrawal. The implications of this study are relevant to inlet management issues such as the mining of an ebb shoal for use as a source of beach sediment and changes in larval transport patterns due to jetty modifications. (Document has 97 pages.)

Item Type: Monograph or Serial Issue
Title: Tidal flood water withdrawal, with special reference to Jupiter Inlet, Florida (M.S.Engineering Thesis)
Personal Creator/Author:
CreatorsEmail
DelCharco, Michael James
Series Name: UFL/COEL
Number: 92/003
Date: 1992
Publisher: University of Florida. Department of Coastal and Oceanographic Engineering
Place of Publication: Gainesville, FL
Additional Information: Thesis, M.S., Engineering
Uncontrolled Keywords: Tidal inlets; Jupiter Island; Florida
Subjects: Oceanography
Engineering
Item ID: 495
Depositing User: Stephanie Haas
Date Deposited: 14 Jan 2008 16:19
Last Modified: 29 Sep 2011 21:57
URI: http://aquaticcommons.org/id/eprint/495

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