Table 4-14. Example estimate of gross longshore transport rate for shore of 

 inland sea. 



(1) H, 



signficant height reduced from gage records, assumed to 

 correspond to the height obtained by visual observers. 



(2) f = decimal frequency of wave heights. 



(4) 



T^ 



= assumed shoaling coefficient ratio. 



(5) Hj, = I > j fH_ = 0.531 meter (1.74 feet) 



6 ? S 



Q = 1.646 X 10 Hl = 4.64 x 10 cubic meters per year from equation (4-56a) , 



or 



5 2 5 



Q = 2 X 10 Hj, = 6.05 X 10 cubic yards per year from equation (4-56b). 



Note that shoreward-moving waves exist only 51 percent of the time. 



completely independent of the longshore energy flux estimate of the deepvater 

 example. 



In this example, wave gage statistics have been used for illustrative 

 purposes. However, visual observations of breakers, such as those listed in 

 Table 4-4, would be even more appropriate since equation (4-56) has been 

 "calibrated" for such observations. On the other hand, hindcast statistics 

 would be less satisfactory than gage statistics, due to the uncertain effect 

 of nearshore topography on the transformation of deepwater statistics to 

 breaker conditions. 



4-107 



