c. Because of a limited supply of sand, the potential transport 

 rates are not realized. The actual net transport rate is 

 estimated to be in the range of 5,000 to 8,000 cu yd/year. 



d. Significant sand transport can occur only during the ice-free 

 period from April through November. During the remainder of 

 the year, the wave height should be considered as being 

 effectively zero for the purpose of shoreline change modeling. 



381. The first step was to produce a time series of offshore wave 



period, height, and direction data using tables presented in Saville (1953). 



For the ice-free period, the hindcast wave climate was defined as "calm" for 



as much as 73 percent of the time. However, the modelers believed that some 



wave activity must occur during at least a portion of the hindcast calm 



periods. As a compromise, in development of the wave time series for this 



case study, a "calm" deepwater wave condition was initially defined as 



T = 2 sec, H = 1 ft, and = deg. Sample lines from the initially 



prepared file WAVES_INIT are listed in Table 4, in which lines of WAVES files 



modified as will be discussed below are given for comparison. 



Table 4 

 Sample Entries Illustrating Development of the WAVES File 



WAVES -INIT 



WAVES -2T 



WAVES -CNG 



WAVES -DIFF 



T 



H 



9 



T 



H 



6 



T 



H 



e 



T 



H 



9 



sec 



ft 



deg 



sec 



ft 



deg 



sec 



ft 



deg 



sec 



ft 



deg 



4.5 



5.00 



-53 



8.0 



5.00 



-53 



8.0 



6.00 



-53 



8.0 



3.06 



-33 



3.0 



2.00 



-30 



6.0 



2.00 



-30 



6.0 



2.40 



-30 



6.0 



1.76 



-30 



3.0 



2.00 



-8 



6.0 



2.00 



-8 



6.0 



2.20 



-8 



6.0 



1.93 



-8 



2.0 



1.00 







4.0 



1.00 







4.0 



1.00 



-10 



4.0 



0.86 



-10 



3.0 



2.00 



15 



6.0 



2.00 



15 



6.0 



1.80 



15 



6.0 



1.75 



15 



3.0 



2.00 



38 



6.0 



2.00 



38 



6.0 



1.60 



38 



6.0 



1.60 



38 



4.0 



3.00 



60 



8.0 



3.00 



60 



8.0 



2.40 



60 



8.0 



2.40 



60 



382. From the time series developed for the WAVES . INIT data file, wave 

 climates for September, October, and November were extracted and compared with 

 the measured time series from 1981. Table 5 shows a comparison between wave 

 properties measured in 1981 and those based on the hindcast of Saville (1953). 



162 



