ar.d provides flow data for the sediment transpor"- studies of Houston (in prep- 

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

 model. 



7. Sconri simulations in WltTl require the input of wind stresses and 

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

 Hurricane Donna are dlmulaced wirn the Standard Project Hurricane (SPH) model 

 (Graham and Wunn 1959; National Oceanic and Atmospheric Administration 

 (NOAA) 1972; Schwerdt, Ho, and '.vatkins 1979). SPH is a par-.metric model tliat 

 characterizes a hurricane by its radius to maximum winds, central pressure 

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

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

 '.;inds and pressures of the March 1962 ncrthe.TSter arc estimated from 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. Wind velocities and pressures for each WIFM cell are read in 

 during the hydrodynamic calculations, and WIFM converts wind vtlocities in 

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



11 



