8. Input and Output. 



Data statements in Program SSURGE establish the number of computa- 

 tional points, number of time steps, output interval, values of the 

 grid and time steps, acceleration due to gravity, bottom stress coeffi- 

 cient, and locations of the simulated hydrographs and current meters, 

 and the Coriolis parameter corresponding to latitude 27" 23.232' N. 



Card input provides the number (NTl) of hurricane description sets, 

 followed by NTl cards giving the time (in hours after start of com- 

 putations) and the three required storm parameters. These are suc- 

 ceeded by one card giving the number (NT2) of hurricane positions to 

 be used, followed by NT2 cards providing the time and storm center 

 positions in the original arbitrary Cartesian grid (see Volume I of 

 this report). NTl need not be equal to NT2, nor must the observed 

 storm parameters and positions coincide in time. 



For the Carla surge computations, the hurricane characteristics are 

 stipulated at 6-hour intervals for the first 18 hours and at 3-hour 

 intervals for the remainder of the 66-hour prototype time simulation. 

 Note the radius to maximum winds are in nautiaal miles ^ the maximum 

 winds are in knots, and the central pressures are in milZibars. Due 

 to the erratic movement of Hurricane Carla, the coordinates of the 

 center of the storm are specified at hourly intervals, except for a 

 single 6-hour interval spanning the end of the simulation. These 

 coordinates are specified in x,y space (100 units = 219 kilometers) . 



The depth field, in fathoms, is introduced followed by the array of 

 scale factors, S . The array of scale factors, DSDXI (an alias for 

 y ) is read along the specified row and the scale factor array DTDET 

 (an alias for v) is specified along the chosen column. 



The following six arrays are the observed hourly water levels (in 

 feet) from Padre Island (HOBSl), Aransas Pass (H0BS2) , Port O'Connor 

 (HOBS 3), Pleasure Pier, Galveston (H0BS4) , Mud Bayou (H0BS5) , and 

 Sabine Pass (H0BS6) . These data are not necessary for any phase of the 

 surge calculations and may be omitted. 



The last two arrays input to SSURGE give the coordinates (XX, YY) 

 of the grid points in units of x,y space, and the sines and cosines 

 of theta at the computational points. 



All input not in the MKS system of units is converted internally 

 to the MKS system. 



The storm parameters, hurricane center coordinates, and depth field 

 are printed out immediately following input. At hourly time intervals, 

 the water level anomalies and the depth averaged velocity component 

 fields are printed. The six simulated hydrographs and current meters 

 are printed out with their positions and the corresponding observed 

 water levels at the completion of the surge simulation. 



44 



