The initial setup refers to the water level at the time the storm surge
computations are started. An approximate relationship giving the atmospheric pressure setup in feet when pressure is expressed in inches of
mercury is
% = ^(Pn-Po) (l-e'R'r)
(3-71)
where pn is the pressure at the periphery of the storm, and r is the
radial distance from the storm center to the computation point on the
traverse line.
The total depth at the new time level is evaluated by the relation:
=
+
(Sx + sJU
(3-72)
+ ïï [(%).'+
The total water level rise at the coast is the sum of ail component water
level changes resulting from the meteorological storm plus those components
which are not related to the storm. Hence the total setup is given by
where
Sr = Sx + Sy + SAp + Sc + sx + Sjp + S£
(3-73)
Sv is a component due to the wave setup in the région shoreward of
the breaker line and is related to the breaker height by Equation 3-49.
(Sec Section 3.85, Wave Setup.) The setup component
accounts for the
setup resulting from local conditions such as bottom configuration, coastline shape, or other flows influencing the System, such as flows from bay
or yivPrs: component can only be estimated from a full understanding of the influence of topographie and hydrographie features not
the numerical calculations. Contributions made by the
vanous setup components to the total surge are shown in Figure 3-46.
hv
5’65, ?"66i and 3-67 can be rewritten in a more useful form
équations
Bence™6115101^1 constants f°r ternis frequently appearing in the
(3-74)
(3-75)
(3-76)
3-106
computations are started. An approximate relationship giving the atmospheric pressure setup in feet when pressure is expressed in inches of
mercury is
% = ^(Pn-Po) (l-e'R'r)
(3-71)
where pn is the pressure at the periphery of the storm, and r is the
radial distance from the storm center to the computation point on the
traverse line.
The total depth at the new time level is evaluated by the relation:
=
+
(Sx + sJU
(3-72)
+ ïï [(%).'+
The total water level rise at the coast is the sum of ail component water
level changes resulting from the meteorological storm plus those components
which are not related to the storm. Hence the total setup is given by
where
Sr = Sx + Sy + SAp + Sc + sx + Sjp + S£
(3-73)
Sv is a component due to the wave setup in the région shoreward of
the breaker line and is related to the breaker height by Equation 3-49.
(Sec Section 3.85, Wave Setup.) The setup component
accounts for the
setup resulting from local conditions such as bottom configuration, coastline shape, or other flows influencing the System, such as flows from bay
or yivPrs: component can only be estimated from a full understanding of the influence of topographie and hydrographie features not
the numerical calculations. Contributions made by the
vanous setup components to the total surge are shown in Figure 3-46.
hv
5’65, ?"66i and 3-67 can be rewritten in a more useful form
équations
Bence™6115101^1 constants f°r ternis frequently appearing in the
(3-74)
(3-75)
(3-76)
3-106