I^i-ogi'aiii Description 



Program Title lOlA Calculation of Wave Parameters from Linear Theory (AOS logic) 



Name W.A. Birkemeier Date 5/8I 



Address *-'^^^ Field Research Facility 



City Kitty Hawk, S,aie North Carolina Zip Code 27949 



Program Description, Equations, Variables, etc. 



This program calculates the product of the wave number and depth, kd, the 

 ratio of group wave speed to wave celerity, n = 0.5 (l+2kd/sinh 2kd) , the 

 group wave speed, Cg, the shoaling coefficient. Kg, the refraction coeffi- 

 cient, Kj-, horizontal orbital velocity, u, and vertical orbital velocity, w. 



Program input includes wave period, T, deepwater wave angle, ao» deepwater 

 wave height, Hq, wave phase angle, 9, depth of water, d, at which results 

 are desired, and depth from surface, z, at which velocities are calculated. 

 This program assumes straight and parallel offshore bottom contours for 

 assumption of Snell's law of refraction. Algorithm uses English or metric 

 system of units. 



REFERENCE 



U.S. ARMY, CORPS OF ENGINEERS, COASTAL ENGINEERING RESEARCH CENTER, Shore 

 Protection Manual, 3d ed.. Vol. I, Ch. 2, Stock No. 008-022-00113-1, 

 U.S. Government Printing Office, Washington, D.C., 1977. 



Operating Limits and Warnings This program can also be used for wave input H, T,and 

 a, from transitional water depths (as in the case when wave gage informa- 

 tion is provided but the gage is not in deep water). In this instance, some 

 program steps must be deleted as- noted in the program listing, and the Kj. 

 computed in the program is not the refraction coefficient for depth, d, but 

 a modified refraction coefficient from the gage site to water depth, d. 



lOlA-1 



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