maximum wind R; the minimum central pressure of the hurricanes p ;
the forward speed of the hurricane Vp, while approaching or Crossing
the coast; and the maximum sustained wind speed W, 30 feet above the
mean water level.
Based on this analysis, the U.S. Weather Bureau (now the National
Weather Service) and U.S. Army Corps of Engineers jointly established
spécifie storm characteristics for use in the design of coastal structures. Because the parameters characterizing these storms are specified
from statistical considérations and not from observations, the storms
are termed hypothetical hurricanes or hypo-hurricanes. The parameters
for such storms are assumed constant during the entire surge génération.»
period. Graham and Nunn (1959) hâve developed criteria for a design storm
where the central pressure has an occurrence probability of once in 100
years. This storm is referred to as the standard project hurricane (SPH).
The mathematical model used for predicting the wind and pressure fields in
the SPH is discussed in Section 3.72, Model Wind and Pressure Fields for
Hurricanes. The SPH is defined as a ”hypo-hurricane that is intended to
represent the most severe combination of hurricane parameters that is
reasonably characteristic of a région excluding extremely rare combinations.” Most coastal structures built by the U.S. Army Corps of Engineers
that are designed to withstand or protect against hurricanes are based on
design water associated with the SPH.
The construction of nuclear-powered electric generating stations m
the coastal zone made necessary the définition of
called the probable maximum hurricane (PMH). The
an extreme hurricane
—maxzmvm nurrveane (PMH). The PMH has been adopted by
the Atomic Energy Commission for design purposes to ensure public safety
and the safety of nuclear-power facilities. Procedures for developing a
PMH for a spécifie geographical location are given in U.S. Weather Bureau
Intérim Report HUR 7-97 (1968). The PMH was defined as ”A hypothetical
hurricane having that combination of characteristics which will make the
most severe storm that is reasonably possible in the région involved, if
the hurricane should approach the point under study along a critical path
and at an optimum rate of movement."
overwaterCwind ^LT4T^parameters and t?ie næthods used for developing
United States are diî
directions for various coastal zones of the
HUR 7-97
dTTnS ln detail by Graham and Nunn (1959) and in
bp rareFiii i s
°rtbj SPH and
The basic design storm data should
results!
determined» Slnce errors may significantly affect the final
Two simple methods are ore^nt^ u
the open coast: one a quasi-statin
e5e ^or estimating storm surge on
graph method. These methods shnni numerical scheme and the other a nomoin bays, estuaries, ri vers or in in
used for estimating the surge
open-coast shoreline. Neither mat/j yin2 régions landward of the normal
cases, but for many problems bo^ a
1S entirely satisfactory for ail
The use of each method isXustîatST tO ?ive. ^easonable solutions,
cnm™ StJrge for an actual hurricane
Th estimating the peak open-coast
modST Tthe SUrge comPuted by a’cJ?î Peak sur?es thus calculated are
or the same storm.
p e^e two-dimensional numerical
3-100
the forward speed of the hurricane Vp, while approaching or Crossing
the coast; and the maximum sustained wind speed W, 30 feet above the
mean water level.
Based on this analysis, the U.S. Weather Bureau (now the National
Weather Service) and U.S. Army Corps of Engineers jointly established
spécifie storm characteristics for use in the design of coastal structures. Because the parameters characterizing these storms are specified
from statistical considérations and not from observations, the storms
are termed hypothetical hurricanes or hypo-hurricanes. The parameters
for such storms are assumed constant during the entire surge génération.»
period. Graham and Nunn (1959) hâve developed criteria for a design storm
where the central pressure has an occurrence probability of once in 100
years. This storm is referred to as the standard project hurricane (SPH).
The mathematical model used for predicting the wind and pressure fields in
the SPH is discussed in Section 3.72, Model Wind and Pressure Fields for
Hurricanes. The SPH is defined as a ”hypo-hurricane that is intended to
represent the most severe combination of hurricane parameters that is
reasonably characteristic of a région excluding extremely rare combinations.” Most coastal structures built by the U.S. Army Corps of Engineers
that are designed to withstand or protect against hurricanes are based on
design water associated with the SPH.
The construction of nuclear-powered electric generating stations m
the coastal zone made necessary the définition of
called the probable maximum hurricane (PMH). The
an extreme hurricane
—maxzmvm nurrveane (PMH). The PMH has been adopted by
the Atomic Energy Commission for design purposes to ensure public safety
and the safety of nuclear-power facilities. Procedures for developing a
PMH for a spécifie geographical location are given in U.S. Weather Bureau
Intérim Report HUR 7-97 (1968). The PMH was defined as ”A hypothetical
hurricane having that combination of characteristics which will make the
most severe storm that is reasonably possible in the région involved, if
the hurricane should approach the point under study along a critical path
and at an optimum rate of movement."
overwaterCwind ^LT4T^parameters and t?ie næthods used for developing
United States are diî
directions for various coastal zones of the
HUR 7-97
dTTnS ln detail by Graham and Nunn (1959) and in
bp rareFiii i s
°rtbj SPH and
The basic design storm data should
results!
determined» Slnce errors may significantly affect the final
Two simple methods are ore^nt^ u
the open coast: one a quasi-statin
e5e ^or estimating storm surge on
graph method. These methods shnni numerical scheme and the other a nomoin bays, estuaries, ri vers or in in
used for estimating the surge
open-coast shoreline. Neither mat/j yin2 régions landward of the normal
cases, but for many problems bo^ a
1S entirely satisfactory for ail
The use of each method isXustîatST tO ?ive. ^easonable solutions,
cnm™ StJrge for an actual hurricane
Th estimating the peak open-coast
modST Tthe SUrge comPuted by a’cJ?î Peak sur?es thus calculated are
or the same storm.
p e^e two-dimensional numerical
3-100