the accuracy of the shoreline change model is not compatible with such 
detailed information. Instead, 56 deepwater wave conditions were selected to 
represent the wave climate. The 56 conditions are defined by all possible 
combinations of wave periods and directions given in Table 3. The directions 
given in Table 3 are with respect to an imaginary line normal to the trend of 
the shoreline. Thus, a wave direction of 0 deg would correspond to waves 
incident normal to the coast. 
Table 3 
Selected Deepwater Wave Periods and Directions 
Pentodare i ia a i Direction 
(sec) (deg) 
4.0 22.5 
6.0 eo 
(35 -7.5 
BE5 -22.5 
9.5 -37.5 
10.5 -52.5 
W245 -67.5 
12.5 
Note: Directions defined in Figure 8. 
56. A unit (1-m) wave height was used for each calculation period and 
direction combination. Since the model RCPWAVE is based on linear wave 
theory, the transformed unit wave height can be interpreted as the product of 
combined refraction, diffraction, and shoaling coefficients (called a trans- 
formation coefficient here). The actual value of the wave height at a partic- 
ular grid point is obtained as the product of the transformation coefficient 
and the deepwater wave height in the WIS time series. Thus, although deep- 
water wave period and direction were described by a limited number (56) of 
combinations, the wave height appearing in each wave condition in the 3-year 
time series was utilized. 
57. The output of the production runs consists of the transformation 
coefficient and wave direction at the nominal 3-m depth at each of the 240 
longshore grid lines. In linear wave theory, employed by RCPWAVE, the wave 
35 
