EM 1110-2-1100 (Part V)
31 Jul 2003
Figure V-3-13. Definition sketch of parabolic model for planform shape
Y
Distance of breakwater from nourished shoreline
Ymin Minimum distance from base (reference) line to mhw shoreline after design storm event
B
Minimum beach width at mhw after nourishment
W
Width of design beach nourishment
Zs
Backshore elevation at baseline
FB
Breakwater freeboard, mhw to crest
Qnet
Net longshore sediment transport rate
Qgross
Gross longshore sediment transport rate
Qoffshore Offshore sediment transport rate for design storm
The planform shape and maximum indentation, Yg can be estimated by the parabolic shape model previously
discussed above. A hyperbolic tangent shape was developed by Moreno and Kraus (1999), which may be
more convenient to apply than the parabolic shape.
V-3-40
Shore Protection Projects
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