Dynamic Flushing of Pocket Marinas

by B. A. Christensen, Univ of Florida, Gainesville, United States,

Document Type: Proceeding Paper

Part of: Coastal Zone '91


The expanding demand for marina space combined with just concerns for the coastal environment has developed an urgent need for methods for evaluation of the flushing characteristics of proposed marinas. While flushing by astronomical tides and air-sea interaction has been treated in earlier publications, the present analysis is limited to the flushing of pocket marinas by currents oriented along the shore or flow in adjacent channels. Rate of flow to and from such marinas is evaluated by the momentum transfer principle used in the development of Reynolds stresses, but on a macroscopic level. Time to drain a volume equal to the basin volume is found. Also, the time history of pollutant concentration in the basin due to catastrophic spills and/or a continuous inflow from external sources is analyzed. A formula for the time needed to reduce a pocket marina's initial pollutant concentration N times is developed to serve as a tool for evaluating the efficiency of this type of marina flushing.

Subject Headings: Ports and harbors | Flushing | Water pollution | Shear stress | Reynolds stress | Channel flow | Open channel flow

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