STORM SURGE SIMULATION IN TRANSFORMED COORDINATES 

 Volume II. Program Documentation 



ty 

 John J. Wanstrath 



I. INTRODUCTION 



Presented in this volume are the program documentation and list- 

 ings of the coded programs for carrying out a simulation of a 

 hurricane- induced storm surge on the Continental Shelf in curvilinear 

 coordinates for a given reach of shelf. There are three separate 

 programs detailed here for this purpose. 



The first program, CONFORM, is employed for evaluation of the 

 transformation coefficients which map the given reach of the Conti- 

 nental Shelf into a rectangle in the image plane, the shelf region 

 being delineated by a smoothed version of the coastline, the shelf 

 break (taken as the 180-meter depth contour in the examples), and 

 bounded laterally by two parallel straight lines. The theory and 

 several example applications of the transformation procedure are 

 given in Section II of Volume I. The example input for CONFORM con- 

 tained in the listings here are for the mapping of the region from 

 a section across Laguna Madre about 90 kilometers south of Brownsville 

 to Marsh Island. Particular care must be taken to follow the pro- 

 cedure exactly for the example if CONFORM is to be verified by obtain- 

 ing the given transformation coefficients. This procedure is given 

 explicitly in the CONFORM documentation. 



The second program, GRID, develops the detailed computing grid 

 information, based on the mapping coefficients evaluated by CONFORM 

 plus coordinate stretching information supplied by the user (see 

 Section III of Volume I). Part of the output of GRID is a listing of 

 the grid positions which are required by the user in order to read 

 from appropriate charts the detailed bathymetry field, which is 

 necessary input for the final program SSURGE. The example data 

 supplied here for GRID are for the Laguna Madre to Marsh Island 

 region. 



Program SSURGE (Shelf Surge) carries out the numerical integra- 

 tion of the storm surge equations in the transformed coordinate system 

 supplied by CONFORM and GRID, using a parametric representation of a 

 hurricane wind field and pressure field. The theory is given in Sec- 

 tion III of Volume I. The particular example data given here are for 

 Hurricane Carla and the Laguna Madre-Marsh Island grid system. 



The appendixes to this volume contain detailed FORTRAN listings 

 of the three programs in this application. The data to be supplied 

 by the user for other applications are discussed in the documentation 

 of each of these programs. 



