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First steps towards
3D numerical modelingof the
river Elbe with SSIIMMarc Roberts
JULI 2010
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P rogrammversions
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http://folk ntnu no/nilsol/ssiim
SSIIM ! SSIIM "
unstructured grid
adaptive grid
structured grid
no adaptive grid
Stead# modelling
$nstead# modelling
Finite %olumen
&'(S
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River '#be ()ittenberg*
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)eometr#:
km "*+ , """ -!.km
"0. km wide floodplain0
%egetation and old river parts ,
)ro#nes and other civilstructures
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+ oa#s
1 2aterdepths0 level
%elocit#
Streamdiversit#
1 4ed level changes ,
Bed Load
Substrate 0
Structurediversit#0
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P re rocessing
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1 Digital elevation model
1 Measured waterlevels and associated discharges -time
series
1 Spatial allocation of the sediment distribution -SedD4
1 Suspended load -SchwebD4
1 Informations about %egetation
1 Spatial , temporal discretisation
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, isc!arge
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5alibration with fi6ed bed:
78. 9 !+ * m;/s -stead#
Flood "**< March to 'pril-! Month unstead#
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+ ri"
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$nstructured )rid
(umber of 5ells 9
. *** *** = *** ***
5ellsi>e 9 3 +. m
Ma6 %ertical
cell distribution 9 < cells
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egetation. Ro&g!ness
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(ikuradse &oughness:
river 9 * *< m
grasland 9 * "". mforrest 9 * "
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+ ro/nes
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E6act positions based onon the gro#nes registerfrom the
2aterwa#s andShipping 'dministration
of the Federal)overment
2hat is erodible?
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Se"iment "istrib&tion
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11
e#ocit/
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%ro&"e &mber
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%&t&re "eve#o ment
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1 Morphological preceding -fractionate transport with
!" sediment si>es
1 Implementation of sediment distribution in " la#ers
-* !* cm and !* , "** cm
1 5oupling of both models -h#draulics andmorphological
1 Implementation of different approaches for theporosit# based
on the sediment distribution
1 'pproach for the calculation of the roughness in the
riverchannel width -3 6 d@* and fi6ed values in
thefloodplain
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Ahank #ou
