and provides flow data for ths^ sediment transport studies of Houston (in prep- 

 aration). The effects of channel dredging can also be studied with this 

 model. 



7. Storm simulations in WIFM require the input of wind stresses and 

 barometric pressures into the computations. The wind and pressure fields for 

 Hurricane Donna are simulated with the Standard Project Hurricane (SPH) model 

 (Graham and Nunn 1959; National Oceanic and Atmospheric Administration 

 (NOAA) 1972; Schwerdt, Ho, and Watkins 1979). SPH is a parametric model that 

 characterizes a hurricane by its radius to maxin.um winds, central pressure 

 deficit, forward speed, and other variables. The parameters needed to re- 

 produce a historical storm can be collected from surface weather charts. The 

 wind;- ana pressures of the March 1962 nortr.uasi... r :"-e estimated f-^rrr. digitized 

 data provided by the Wave Information Study (WIS) at the U. S. Army Engineer 

 Waterways Experiment Station (WES) (Corson, Resio, and Vincent 1980; Resio, 

 Vincent, and Corson 1982). WIS data are referenced to an earth-coordinate 

 system, and a computer code was developed to interpolate this information to 

 WIFM grids. Wir.d velocities and pressures for each WIFM cell are read in 

 during the hydrodynamic calculations, and WIFM converts wind velocities in 

 surface stress by Charnock's relation (Garrett 1977). 



11 



