Table 6 

 Calculated Annual Potential Transport Rates 

















Angle to 











Wave 



Shoreline 



No. of 





Net Rate 



Gross Rate 



Direction 



deg 



Events 



10 3 



cu yd/year 



-41 



10 3 cu yd/year 



NNE 



-53 



55 





N 



-30 



49 





-26 



-- 



NNW 



-8 



47 





-18 



-- 



CALM 







713 









-- 



NW 



15 



37 





23 



-- 



WNW 



38 



49 





76 



-- 



W 



60 



26 





38 



-- 



All Directions 



976 



51 



224 



order of magnitude, but in the wrong direction. No information was available 

 for comparing the calculated gross transport rate. Several factors in the 

 derivation of the wave time series might account for the difference between 

 the present and previously calculated net annual transport rates: the 

 simplified method of hindcasting the waves in producing the wave tables; the 

 somewhat arbitrary development of the time series from the hindcast statis- 

 tics; and the assumption that the 3 -year period 1948-50 is fully represen- 

 tative for the situation after 1977. But the major reason for the difference 

 is probably that the wave data set pertains to Cleveland and does not account 

 for local characteristics at Lorain. In particular, as the fetch for westerly 

 waves is shorter for Lorain, waves from the west are expected to be smaller at 

 Lorain than at Cleveland. 



386. Taking all these factors into account, the wave height in the time 

 series was modified by multiplying by the following values (representing 

 educated guesses to produce the desired effect) according to direction to 

 develop a new wave time series: 0.8 (W) , 0.8 (WNW), 0.9 (NW) , 1.0 (calm), 

 1.1 (NNW), 1.2 (N), and 1.2 (NNE). Also, during periods of the modified calm 

 conditions as described above, the offshore wave direction was set to -10 deg 

 to the trend of the shoreline rather than perpendicular to better represent 

 the longer fetch to the northeast. The transformation to the new wave data 

 file WAVES_CNG is illustrated by sample lines in Table 4. Using the new wave 



164 



