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Title: An analysis of drag coefficient at hurricane windspeeds from a numerical simulation of dynamical water level changes in Lake Okeechobee, Florida
Authors: Whitaker, Robert E.
Reid, Robert O.
Vastano, Andrew C. (Andrew Charles)
Keywords: Storm surges--Florida--Okeechobee, Lake
Storm surges--Mathematical models
Publisher: Coastal Engineering Research Center (U.S.)
Series/Report no.: Technical memorandum;no. 56
Abstract: Abstract: A time-dependent, two-dimensional storm surge algorithm has been used to estimate the drag coefficient, over the windspeed range 10 meters above MWL. The algorithm represents a vertically integrated physical model which includes nonlinear boundary conditions representing flooding and recession. Wind and water level data for the investigation were gathered by the U.S. Army Engineer District, Jacksonville, in 'the Lake Okeechobee, Florida, region. The lake is a roughly circular feature 60 kilometers in diameter with a maximum normal depth of 4 meters. The effect of extensively grassed, shallow areas of the lake on wind-driven circulation was simulated by a multilayer canopy flow model and included as a subroutine in the numerical analog. The surge model was calibrated for empirical constants with two seiches and quasi-static wind-induced condition within the lake. Two wind-stress relationships, a quadratic one and the Keulegan- Van Dorn expression, were used to model the air-sea interaction. Multiple surge calculations were performed with a range and statistical analyses made of the difference between the observed and computed water levels for the hurricane of August 1949. The results indicate that the Keulegan- Van Dorn wind-stress model yields superior results over the windspeed range. This conclusion was verified by a simulation of the surge associated with the hurricane of October 1950.
Description: Technical Memorandum
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Technical Memorandum

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