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W. Ritzrau . H. Fohrmann
Diffusion·Advection alone
1 0 ( h - - - - - - - - - . . . ,
Settling velocity
ws:50md"1
Settlingve!ocity
a
( '.
ws =80mc:t 1
~ .. : ........... \ ..... "' .. ,
0-01-t-.--.TTT~",,"-nTh-M'TTT-nT;:;;-,.j
o 0.005 0.01 0-015 0,02 0,025 0,03 0
Diffusion·Advection +
L turbulent aggregation
+ differential settling
b
Diffusion-Advection +
L (turbulent aggregation
+ differential settling)
- disaggregation
c
•
Settling velocity
....
/
ws ",80md· 1
".
",
-"'"
......
110" 2 10. 5 310. 5 410' 510' 0
Fraction' of total mass in the simulation
10'~~-------~
\\ ~+--seWing velocity
\ \
ws=30md"l
Setlllngveloci!y
ws ",50md-1
d
...... ,
,
~Settlingvelocity
I . . ~50md·,
-+- Settling velocity
ws"SOmct'
e
\---,--\~
,
... SeWing velocity
\
ws :SOmc:t1
Seltlmgve~ ....
.,~80md" ...... /
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c: c..
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0
0
c..
0 '<
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III
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3
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CD
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o III
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01 o·
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o 0.005 0.01 0,015 0,02 0.D25 0,03 0
510. 5 0,0001 0,00015 0,0002 0
5 10' 0,0001 0,00015 0,0002
Fraction of total mass in the simulation
Fig. 6 Fraction of the initially added mass (sum of all three size classes, ca. 150 g) of each
aggregate size class for two different hydrodynamic regimes. a-e Regime 1 with u lOO =
0.1 ms-' and d-f regime 2 with u lOO = O.5ms-'. Results are shown for the diffusion-advection model alone (a+d, experiments 4 and 5), the model including aggregation (b+e, experiments 6 & 7) and the model including aggregation and disaggregation (e+f, experiments 8
and 9). For these cases aggregate mass fractions are plotted for aggregates with settling velocity 000 (dashed line), 50 (solid line) and 80 mday' (dotted line). (NOTE different scales
for ad, be and ef).