time series, the annual net transport rate was calculated to be -57,000 cu yd, 

 and the gross rate was calculated to be 227,000 cu yd. Thus, agreement with 

 the net rate of -60,000 cu yd as given in the GDM (USAED, Buffalo 1975) is now 

 very good. 



387. The next step in preparation of the WAVES input file was to 

 include the shadowing or diffraction effect of Lorain Harbor. However, 

 because of the limited size of the Lakeview Park project and the considerable 

 distance between it and the lakeward ends of the harbor structures, it was not 

 possible to include the effect of the harbor directly in simulations by 

 GENESIS. Instead, a computer routine was written to recalculate a new 

 offshore wave time series, including the influence of the harbor. At each 

 6-hr interval in the wave time series, the routine read the triplet (T, H , 

 8 ) at the 30-ft contour, transformed the wave conditions to the depth of the 

 outer breakwater tip (28 ft), and calculated a representative diffraction 

 coefficient K D for the Lakeview Park region following the procedure 

 described by Kraus (1984, 1988a). A modified offshore wave height was then 

 calculated as H' = K D H . Also, the wave angle was restricted to be greater 

 than -33 deg, representing the line between the outer breakwater tip and 

 Lakeview Park. The resultant modified wave heights by direction are summar- 

 ized in Table 7 . 



388. The transformation to the modified wave data file WAVES_DIFF is 

 illustrated with sample lines in Table 4. Using this new time series to 

 represent wave conditions at Lakeview Park, the annual net transport rate was 

 calculated to be 22,000 cu yd, and the gross rate was calculated to be 

 144,000 cu yd. Thus, agreement with the previously obtained net rate of 

 21,500 cu yd and the gross rate of 164,000 cu yd is good. 



389. In summary, through use of third-party coastal experience at the 

 site together with modeling judgment, the original file WAVES_INIT was 

 modified in a series of steps to arrive at WAVES_DIFF, which was developed to 

 have desirable properties for serving for calibration and verification of 

 GENESIS. Being satisfied with premodeling testing of the wave time series, 

 WAVES_DIFF was copied over to serve as the input wave file WAVES.DAT (Appendix 

 D) to drive GENESIS. 



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