Q,q Three-dimensional ground coordinate and corresponding two- 

 dimensional image coordinate in photogrammetry 



S^it) Radiation stress 



S(f r , Q m ) Discrete wave energy frequency-direction spectrum 



t Time, s 



T Peak period in energy spectra 



u, v Cross-shore and longshore edge wave velocity components 



U{ x,y,t) Total current vector 



V Peak longshore current 



max ° 



V Mean longshore current 



x Cross-shore coordinate, at shoreline, positive offshore for wave 

 measurements; image plane coordinate for photogrammetry 



y Longshore coordinate for wave measurements, image plane 

 coordinate for photogrammetry 



X, Y, Z Cross-shore, longshore, and vertical ground coordinates used in 

 photogrammetry 



Z c Camera height above X-Y plane 



a, y, t Camera view angles in photogrammetry 



p Beach slope 



P +i , P_ 4 Effective beach slope for edge waves in the presence of a longshore 



current 



r| Surface elevation from still-water level 



u Angle of line on beach relative to cross-shore axis 



£ Iribarren number 



p Water density 



C2 



Appendix C Notation 



