Data for the SEAWL file 



377. The seawall in the model was placed at the location of the seawall 

 running along the beach, as read from the aerial photographs. The SEAWL file 

 is given in Appendix D. 



Data for the DEPTH file 



378. A DEPTH file was not required because an external wave transforma- 

 tion model was not used. The reasoning was that diffraction from the break- 

 waters was considered to be the dominant wave transformation process, and 

 alongshore variations in breaking wave height and direction because of wave 

 refraction over the relatively plane and parallel offshore bathymetry would be 

 comparatively small. 



Data for the WAVES file 



379. As in most shoreline change modeling studies, wave measurements 

 for the site for the time interval between measured shoreline positions were 

 not available. Instead, a well-known 3 -year wave hindcast for Lake Erie for 

 the period 1948-1950 was used (Saville 1953) and checked for general trends 

 with readily available gage data. The hindcast, presented in tabular form, 

 was originally developed for Cleveland, Ohio, located 28 miles east of Lorain. 

 Also, a more recent wave data time series of height and period was available 

 from a gage located in 30 ft of water off Cleveland Harbor for the period 

 September to November 1981. The gage data were used to modify the time series 

 developed from the hindcast in three stages, as discussed below. 



380. Breaking waves are the principal driving force for longshore sand 



transport. Therefore, an effort must be made to prepare a wave data set with 



properties that produce reasonable transport rates. For this case study, the 



GDM (USAED, Buffalo 1975) provided the basic information about the general 



sediment transport condition in the area. Key findings used for guidance in 



preparing the wave data set were: 



a. Far from the influence of wave sheltering by Lorain Harbor, 

 the net transport in the area is estimated to be from east to 

 west with an annual rate of about 60,000 cu yd. 



b- Because of sheltering of waves from the west by Lorain Harbor, 

 the net transport at Lakeview Park is from west to east with 

 an estimated net potential rate of 21,500 cu yd per year. The 

 estimated annual gross potential rate is about 164,000 cu yd. 



161 



