Geology Reference
In-Depth Information
Fig. 8.14
Yearly isochrons of sediment surfaces buried during
a salt marsh accretion equivalent to 1.7 kg m
−2
year
−1
. The physi-
cal parameters of the salt marsh in question are equal to those of
the marsh type illustrated in Fig.
8.13
. The deposition starts on
an incompressible base here thought of as the sand fl at beneath
the salt marsh deposits. The absolute level of the salt marsh surface
relative to the sand fl at surface is indicated by the
left
end of the
isochrons (From Bartholdy et al.
2010b
)
PI
(8.7)
Δ=Δ+Δ−Δ−Δ
ES
S
salt marsh, D
S
org
is the accretion rate due to biomass
production, D
P
is the rate of autocompaction and
D
I
is the rate of isostatic movement in the area.
Sometimes it may be preferable to evaluate the salt
marsh level change in relation to the relative sea level.
sed
org
D
E
is the change in absolute level over the consid-
ered time interval which is usually taken as 1 year,
D
S
sed
is the accretion rate of sediment supplied to the
