EM 1110-2-1100 (Part V)
31 Jul 2003
V-3-8. Definition of Symbols
Breaker depth index (Equation II-4-3) [dimensionless]
γb
B
Minimum beach width at mhw after nourishment [length]
Size of the 50th percentile of the sediment sample [length]
d50
dS
Average depth at breakwater below mean water level [length]
e
Erosion of shoreline (mhw) from design storm [length]
FB
Breakwater freeboard, mhw to crest [length]
IS
Beach response factor (Equation V-3-10) [dimensionless]
Lg
Gap distance between adjacent breakwaters [length]
LS
Length of breakwater structure [length]
Erosion rate after human activities [length3/time]
PA
Natural background erosion rate [length3/time]
PN
Gross longshore sediment transport rate [length3/time]
Qgross
Net longshore sediment transport rate [length3/time]
Qnet
Offshore sediment transport rate for design storm [length3/time]
Qoffshore
Rp
Coastal erosion ratio [dimensionless]
Rv
Coastal erosion volume ratio [dimensionless]
Volume loss rate after construction of roads, seawalls, etc. [length3/time]
VA
Natural erosion volume loss rate [length3/time]
VN
W
Width of design beach nourishment [length]
WTR
Seawall trap ratio [dimensionless]
Xg
Longshore groin spacing [length]
Y
Distance of breakwater from nourished shoreline [length]
Yg
Maximum indentation under normal wave conditions [length]
Effective groin length measured from its seaward tip to the design shoreline for
Yg
beach fill at the time of construction [length]
Minimum dry beach width [length]
Ymin
Ymin
Minimum distance from base (reference) line to mhw shoreline after design storm
event [length]
Yo
Shore Protection Projects
V-3-109
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