SYMBOLS AND DEFINITIONS 



time 



ox horizontal axis at S W L parallel to the (initial) beach profile 



oy horizontal axis at S W L perpendicular to the (initial) beach 

 profile 



D beach depth (depth beyond which sediment transport is negligible) 



wave angle with beach profile 



wave angle with beach profile at infinity 



K 



longshore transport (littoral drift) discharge 

 1 dQ 



constant 



D da 



u parameter u =/^^aH 

 E(u) Fresnel integral = E(u) 



I 



e du 



a length of groin 



t time for the beach profile to reach the end of the groin 



t' transform time t ' = 0.62t 



B sinusoidal beach amplitude (at time t = o) 



