ERDC/CHL CHETN-III-70
July 2005
Figure 1. Irregular wave runup guidance given in the Coastal Engineering Manual for rough,
impermeable slopes
New Wave Runup Equation: Hughes (2003a, 2004a) presented a new nondimensional param-
eter representing the maximum depth-integrated wave momentum flux that occurs in progressive
water waves. The parameter, referred to as the wave momentum flux parameter (PMF), was defined
as
⎛M ⎞
PMF = ⎜ F2 ⎟
⎝ ρgh ⎠max
where
MF =
depth-integrated wave momentum flux
ρ=
fluid mass density
g=
gravitational acceleration
h=
water depth
Because (MF )max has units of force per unit wave crest length, it was argued that maximum depth-
integrated wave momentum flux would provide a good characterization of wave processes at coastal
structures.
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