Storm Surge Simulation in Transformed Coordinates. Volume II. Program Documentation.
TEXAS A AND M RESEARCH FOUNDATION COLLEGE STATION
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A two-dimensional time-dependent numerical storm surge model using orthogonal curvilinear coordinates is presented. The curvilinear coordinate system is based on a conformal mapping of the interior region bounded by the actual coast, the seaward boundary taken as the 180-meter depth contour and two parallel lateral boundaries into a rectangle in the image plane. Three regions of the Continental Shelf of the Gulf of Mexico and two regions of the eastern seaboard of the United States are mapped. Since the transformation is conformal, the associated modifications of the vertically integrated equations of motion and mass continuity are minimized. The coast, seaward boundary, and the lateral boundaries of the computing grid are straight lines in the image plane thus facilitating the application of the boundary conditions. The final coordinates allow for the greatest resolution near the coast in a central area of principal storm surge development and modification. The model is employed in the simulation of the storm surge induced by Hurricanes Carla 1961 and Camille 1969 which crossed the gulf coast of the United States and Hurricane Gracie 1959 which crossed the east coast. Analytical interpretations of the wind and atmospheric pressure-forcing functions are used in the computations. Author
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