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Title: Hurricane surge stage-frequency analysis for Dade County, Florida
Authors: United States. Army. Corps of Engineers. Jacksonville District.
Abel, Charles Eugene.
Keywords: Atlantic coast.
Mathematical models.
Numerical models.
Coriolis force.
Storm surges.
Dade County (Fla.)
Publisher: Hydraulics Laboratory (U.S.)
U.S. Army Engineer Waterways Experiment Station.
Series/Report no.: Technical report (U.S. Army Engineer Waterways Experiment Station) ; HL-80-14.
Description: Technical Report
Abstract: A numerical investigation of the hurricane surge stage-frequency relationship has been performed for a 14.3-mile section of the Atlantic coast of Dade County, Florida. An idealized coast was used to represent current improvements to erosion and hurricane protection structures being supervised by the U.S. Army Engineer District, Jacksonville. The vertically integrated equations of motion are solved, using the formalism of the orthogonal curvilinear numerical open-coast surge model, SSURGE III. This model includes Coriolis effects, surface wind stress, bottom frictional stress, and the "inverted barometer" effect, but omits the nonlinear convective acceleration terms. Surface wind stress is the dominant forcing function for the present application of the numerical model. The hurricane wind field model adopted in this study conforms to the 1972 criteria for the Standard Project Hurricane. An ensemble of 270 hypothetical hurricanes was produced by compounding three landfall sites, three storm track headings, two radii to maximum wind, three forward translation speeds, and five central pressure values. The central pressure values selected were those appropriate to mean recurrence intervals of 5, 10, 20, 50, and 100 years along the southeastern Florida coast. Statistical analyses were performed for three beachfront sites in the area of interest. Estimates were made of exceedance probabilities for peak open-coast surge and for the net setup due to the peak surge and wave setup due to breaking. For each of the nine combinations of landfall site and beachfront site, a set of nomograms was produced. These provide an approximate representation of the relation between peak setup, forward speed, radius to maximum wind, and central pressure deficit for each of the three track headings. The nomograms have an overall root-mean-square percentage error of 7.0 percent when compared with individually computed peak surge/wave setup values. Among the 27 individual nomograms, the percentage error covered a range from 3.5 percent to 10.4 percent. Maximum absolute error in the worst case was less than 1 ft. This level of accuracy is consistent with the approximations and uncertainties inherent in the numerical models used in the study.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Technical Report

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