notable rapid rearrangement of a profile is by storm waves, especially
during storm surge (Section 3.8) which enables the waves to attack at
higher élévations on the beach.
(see Figure 1-7.)
The part of the beach washed by runup and runback is the beach face.
Under normal conditions, the beach face is contained within the foreshore, but during storms, the beach face is moved shoreward by the cutting action of the waves on the profile. The waves during storms are
and the runback of each wave on the beach face carries away more
" ' ’ -----" -------, Thus
steeper, i__ ____ _______
sand than is brought to the beach by the runup of the next wave,
the beach face migrâtes landward, cutting a scarp into the berm. (See
Figure 1-7.)
In moderate storms, the storm surge and accompanying steep waves will
subside before the berm has been significantly eroded. In severe storms, or
after a sériés of moderate storms, the backshore may be complétély eroded,
waves will begin to erode the Coastal dunes, cliffs, or main
after which the
land behind the beach.
The extent of storm érosion dépends on wave conditions, storm surge,
the stage of the tide and storm duration.
Potential damage to property behind ^thl^eaîh-dune System when a
factors and on the volume of sand stored m t
storm occurs.
it is useful to know the magnitude
For planning and design purposes,
ctorms. Table 4-5 tabulâtes
of beach érosion to be expected during seve
.
the Atlantic coast
the effect of four notable extratropica s o
tvDiCal observed order-ofof the U.S. This table provides information
yp
from single
magnitude values for beach érosion above mea
storms.
seven loc^^ ^torm of 17 December 1970, information is available from
three othe ltlGS t0011111111 2 of Table 4"5)- (DeWall, et al., 1971.) The
Ne» York
storms include two closely spaced storms affecting Jones Beach,
^tthern^N111 FebruarY 1972 (Everts, 1972), and a storm that affected the
istjcs thatWdJerSey C°aSt in November 1953- (Caldwell, 1959.) Charactersurge. fc dlstinguish one storm from another are duration and storm
for the I7n C°lUInns
and 10, Table 4-5.) Storm waves lasted about 1 day
storms
fc ecember 1970 storm, and about 2 days for the other three
feet tô
, ?e Column 9.) Storm surge élévation varied from a low of 2.8
storm comb’lgh
$ ^eet in the New York Bight area. The November 1953
storm had
^on^er duration and high storm surge; the 17 December 1970
storms b th i°rt duration and moderate storm surge; and the February 1972
other w-i+k lad longer duration, one with moderate storm surge and the
low storm surge.
da®ageUda^iOn and st°rm surge (Columns 9 and 10) are consistent with storm
the choie 3 ^Colurans H through 16, although the effect is influenced by
e of profiles included in each study. The December 1970 storm
4-71
during storm surge (Section 3.8) which enables the waves to attack at
higher élévations on the beach.
(see Figure 1-7.)
The part of the beach washed by runup and runback is the beach face.
Under normal conditions, the beach face is contained within the foreshore, but during storms, the beach face is moved shoreward by the cutting action of the waves on the profile. The waves during storms are
and the runback of each wave on the beach face carries away more
" ' ’ -----" -------, Thus
steeper, i__ ____ _______
sand than is brought to the beach by the runup of the next wave,
the beach face migrâtes landward, cutting a scarp into the berm. (See
Figure 1-7.)
In moderate storms, the storm surge and accompanying steep waves will
subside before the berm has been significantly eroded. In severe storms, or
after a sériés of moderate storms, the backshore may be complétély eroded,
waves will begin to erode the Coastal dunes, cliffs, or main
after which the
land behind the beach.
The extent of storm érosion dépends on wave conditions, storm surge,
the stage of the tide and storm duration.
Potential damage to property behind ^thl^eaîh-dune System when a
factors and on the volume of sand stored m t
storm occurs.
it is useful to know the magnitude
For planning and design purposes,
ctorms. Table 4-5 tabulâtes
of beach érosion to be expected during seve
.
the Atlantic coast
the effect of four notable extratropica s o
tvDiCal observed order-ofof the U.S. This table provides information
yp
from single
magnitude values for beach érosion above mea
storms.
seven loc^^ ^torm of 17 December 1970, information is available from
three othe ltlGS t0011111111 2 of Table 4"5)- (DeWall, et al., 1971.) The
Ne» York
storms include two closely spaced storms affecting Jones Beach,
^tthern^N111 FebruarY 1972 (Everts, 1972), and a storm that affected the
istjcs thatWdJerSey C°aSt in November 1953- (Caldwell, 1959.) Charactersurge. fc dlstinguish one storm from another are duration and storm
for the I7n C°lUInns
and 10, Table 4-5.) Storm waves lasted about 1 day
storms
fc ecember 1970 storm, and about 2 days for the other three
feet tô
, ?e Column 9.) Storm surge élévation varied from a low of 2.8
storm comb’lgh
$ ^eet in the New York Bight area. The November 1953
storm had
^on^er duration and high storm surge; the 17 December 1970
storms b th i°rt duration and moderate storm surge; and the February 1972
other w-i+k lad longer duration, one with moderate storm surge and the
low storm surge.
da®ageUda^iOn and st°rm surge (Columns 9 and 10) are consistent with storm
the choie 3 ^Colurans H through 16, although the effect is influenced by
e of profiles included in each study. The December 1970 storm
4-71