Geoscience Reference
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Following Thorn (1981) and Mehta (1986), one can have the following formulation
for the correction factor K s :
k 1 C n
0
<
C
C p
K s
=
(11.11)
) β
k
(
1
k 2 C
C
>
C p
) β .
Note that Eq. (11.11) adopts the original formulation of Eq. (11.2), but the
coefficient k 1 should be adjusted accordingly. The reason is that the effects of sediment
size, salinity, and turbulence intensity on flocculation are accounted for by three
correction factors in Eq. (11.9), whereas these effects are lumped into k 1 in Eq. (11.2).
Fig. 11.8 shows the relation between K sa and salinity based on Huang's data for the
Lianyun Harbor mud. The trend can be approximated by
k 1 C p /(
where k
=
1
k 2 C p
(
n sa
C sa
/
C sap
)
C sa ,min
<
C sa
C sap
K sa
=
(11.12)
1
C sa
>
C sap
where n sa is an empirical exponent, C sap is the salinity at which the influence of salinity
tends to be saturated, and C sa ,min is a small threshold value of salinity above which
Eq. (11.12) is valid.
Figure 11.8 Relation of K sa and salinity based on Huang's (1981) data (Wu and Wang, 2004c).
It can be seen from Fig. 11.6 that C sap and n sa are related to sediment concentration.
According to the investigations of Owen (1970), Huang (1981), and Yue (1983), C sap
has a value of about 30 ppt. The approximation curve in Fig. 11.8 is obtained from
Eq. (11.12) with C sap
0.53. The exponent n sa is 0.75 in the Yue
(1983) formula (11.4) and 0.03 in the modified Peng formula (11.7). This difference
may be because their experiments are in different ranges of salinity.
=
28 ppt and n sa
=
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