Frogi-ani Deseriplion 



102A Linear Wave Approximation to Breaking Wave Height and 

 Program Till. Breaking Wave Angle (AOS logic) 



*"""' W.A. Birkemeier D"«« 5/81 



Address CERC Field Research Facility 

 City Kitty Hawk, Slate North Carolina Zip Code 27949 



Program Description, Equations, Variables, etc. 



This program calculates breaking wave height, H^, and breaking wave angle, 

 a^, using linear wave theory approximations combined with the shallow-water 

 breaking assumption. Input parameters are wave height, H, wave period, T, 

 wave angle, a, and the water depth, d, where the preceding three variables 

 are measured. An additional input parameter is nearshore beach slope, m. 

 The ratio of the breaking wave height to the water depth at breaking is pre- 

 dicted using the equation 



/ jjj \ . 2 2 



from Singamsetti and Wind (1980), where db is the water depth at breaking, 

 Hq the deepwater wave height, and Lq the deepwater wavelength. This solu- 

 tion requires the assumption of straight and parallel offshore bottom con- 

 tours for the application of Snell's law of refraction. Input wave para- 

 meters H, T, and a can be in any depth of water, d. Algorithm uses English 

 or metric system of units. The development of the equation is derived on 

 the solution sheet included with program 102R. 



REFERENCES 



SINGAMSETTI, S.R., and WIND, H.G., "Characteristics of Shoaling and Breaking 

 Periodic Waves Normally Incident to Plane Beaches on Constant Slope," 

 Report No. M1371, Toegepast Onberzoek VJaterstaat, July 1980. 



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

 Pvoteotian 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 Warning* 



102A-1 



34 



