dsd-int 2015 - the next steps, horizontal flow field modelling using delft3 d fm
TRANSCRIPT
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Delft, 3rd of November 2015
Frank Platzek (Deltares) Regina Patzwahl (BAW)
mesoscale horizontal flow-field modelling at a
channel-river junction
Delft Software Days 2015
A behavioral study
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Delft, 3rd of November 2015
Frank Platzek (Deltares) Regina Patzwahl (BAW)
more mesoscale horizontal flow-field modelling at a
channel-river junction
Delft Software Days 2015
A behavioral study
![Page 3: DSD-INT 2015 - the next steps, horizontal flow field modelling using delft3 d fm](https://reader031.vdocuments.net/reader031/viewer/2022030318/58ee141a1a28ab04258b46c3/html5/thumbnails/3.jpg)
Delft, 3rd of November 2015
Frank Platzek (Deltares) Regina Patzwahl (BAW)
Even more mesoscale horizontal flow-field modelling at
a channel-river junction
Delft Software Days 2015
A behavioral study
![Page 4: DSD-INT 2015 - the next steps, horizontal flow field modelling using delft3 d fm](https://reader031.vdocuments.net/reader031/viewer/2022030318/58ee141a1a28ab04258b46c3/html5/thumbnails/4.jpg)
Delft, 3rd of November 2015
Frank Platzek (Deltares) Regina Patzwahl (BAW)
Even more mesoscale horizontal flow-field modelling at
a (modified) channel-river junction
Delft Software Days 2015
A behavioral study
![Page 5: DSD-INT 2015 - the next steps, horizontal flow field modelling using delft3 d fm](https://reader031.vdocuments.net/reader031/viewer/2022030318/58ee141a1a28ab04258b46c3/html5/thumbnails/5.jpg)
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Outline
1. Geometrical setting
2. Field measurements
3. Scale model
4. Numerical model
5. Lessons learned 2013
6. Lessons learned 2014: Sheet pile wall modelling for beginners
Even more horizontal flow field modelling | Frank Platzek, Regina Patzwahl
04/12/2015 Page 7
Introduction
1. Geometrical setting
2. Field measurements
3. Scale model
4. Numerical model
5. Lessons learned 2013
6. Lessons learned 2014: Sheet pile wall modelling for beginners
7. Another channel mouth geometry
8. Results from D-Flow FM
9. Lessons learned
So, what‘s new this
year?
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Geometrical setting
Even more horizontal flow field modelling | Frank Platzek, Regina Patzwahl
04/12/2015 Page 8
Import of coarse AND fine material
into the channel mouth
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04/12/2015
Even more horizontal flow field modelling | Frank Platzek, Regina Patzwahl
Page 9
Geometrical setting
Topography in the vicinity of the channel mouth: groynes, dunes, sediment deposition on upstream side of the inlet, dregded fairway on the downstream side of the inlet
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Depth-averaged ADCP-measurements
Even more horizontal flow field modelling | Frank Platzek, Regina Patzwahl
04/12/2015 Page 10
950 m³/s 1700 m³/s
1950 m³/s 840 m³/s
• Flow velocities increase with discharge
• Position of eddy is discharge independent
950 m³/s
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ADCP-cross profiles
Even more horizontal flow field modelling | Frank Platzek, Regina Patzwahl
04/12/2015 Page 11
Source: Ing. Büro Schmid
• Horizontal eddy (2D-problem)
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Scale model
Even more horizontal flow field modelling | Frank Platzek, Regina Patzwahl
04/12/2015 Page 12
4 km of river stretch = 67 m of model length
Length Scaling: 1:60
Height Scaling: 1:30
Stationary discharge conditions, non-movable gravel bed
Polystyrol tracer for investigation of transport processes
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Numerical model
Even more horizontal flow field modelling | Frank Platzek, Regina Patzwahl
04/12/2015 Page 14
• 11 km long river model
• grid types:
• quadrilateral (dx=2m),
river axis aligned,
# of elements: ~ 800.000
• triangular (dx=1,5m),
# of elements: ~ 2.500 000
• discharge at inflow: 986 m³/s
• water level at outflow: 4.71 m
• const. hor. visc.0.0001 m²/s
• 1. and 2. order advection
• Smagorinsky off/ on
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Lessons learned 2013
Even more horizontal flow field modelling | Frank Platzek, Regina Patzwahl
04/12/2015 Page 15
The modelled flow field in the junction domain is sensitive to:
advection scheme
Constant viscosity
Grid type
„Smagorinsky“
Lower velocities in
the eddy field
Numerical diffusion
„physically correct“?
Arguably improved?
Grid-dependent
results
advection scheme
= crucial choice!
Grid-dependent
results
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Lessons learned 2013
Even more horizontal flow field modelling | Frank Platzek, Regina Patzwahl
04/12/2015 Page 16
Best modelling result
Quads, Hor. Visc.1.0*10-4
Perot 3, Smag Field measurements Scale model
• Excellent validation case for modelling mesoscale horizontal recirculation
• Unique combined set of field data, scale model and numerical model data
=> We follow the project with D-FLOW FM for studying purposes
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Lessons learned 2014
Even more horizontal flow field modelling | Frank Platzek, Regina Patzwahl
04/12/2015 Page 17
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Lessons learned 2014
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04/12/2015 Page 18
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Lessons learned 2014
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04/12/2015 Page 19
/rough /smooth
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Lessons learned 2014
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04/12/2015 Page 20
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Lessons learned 2014
Even more horizontal flow field modelling | Frank Platzek, Regina Patzwahl
04/12/2015 Page 21
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Lessons learned 2014
Even more horizontal flow field modelling | Frank Platzek, Regina Patzwahl
04/12/2015 Page 22
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Another channel mouth geometry
Even more horizontal flow field modelling | Frank Platzek, Regina Patzwahl
04/12/2015 Page 23
1. Widening of cross-section in the main flow -> deposition of bed load and suspended load in the river
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Another channel mouth geometry
Even more horizontal flow field modelling | Frank Platzek, Regina Patzwahl
04/12/2015 Page 24
1. Widening of cross-section in the main flow -> deposition of bed load and suspended load in the river 1. Widening of cross-section in the main flow -> deposition of bed load and suspended load in the river
2. No bed load transport into channel mouth
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Another channel mouth geometry
Even more horizontal flow field modelling | Frank Platzek, Regina Patzwahl
04/12/2015 Page 25
1. Widening of cross-section in the main flow -> deposition of bed load and suspended load in the river 1. Widening of cross-section in the main flow -> deposition of bed load and suspended load in the river
2. No bed load transport into channel mouth
3. No suspended load transport into channel mouth
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Another channel mouth geometry
Even more horizontal flow field modelling | Frank Platzek, Regina Patzwahl
04/12/2015 Page 26
1. Widening of cross-section in the main flow -> deposition of bed load and suspended load in the river 1. Widening of cross-section in the main flow -> deposition of bed load and suspended load in the river
2. No bed load transport into channel mouth
3. No suspended load transport into channel mouth
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Another channel mouth geometry
Even more horizontal flow field modelling | Frank Platzek, Regina Patzwahl
04/12/2015 Page 28
1. Widening of cross-section in the main flow -> deposition of bed load and suspended load in the river 1. Widening of cross-section in the main flow -> deposition of bed load and suspended load in the river
2. No bed load transport into channel mouth
3. No suspended load transport into channel mouth
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1. Order advection 2. Order advection
Results from numerical model
Even more horizontal flow field modelling | Frank Platzek, Regina Patzwahl
04/12/2015 Page 31
No stationarity observable Develops towards a
stable condition
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1. Order advection 2. Order advection 1. Order advection 2. Order advection
Results from numerical model
Even more horizontal flow field modelling | Frank Platzek, Regina Patzwahl
04/12/2015 Page 35
No stationarity observable
Develops towards a
stable condition
Develops towards a
stable yet different
condition
Develops towards a
stable condition yet
different
+ Smagorinsky
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Results
Even more horizontal flow field modelling | Frank Platzek, Regina Patzwahl
04/12/2015 Page 38
With the calibration of the current state we identified relevant dependencies of the
results on the model set-up
- the jokers helped to identify the „values“ of the „playing cards“
JOKER
measure
ments
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- the modified geometry led to
different dependencies…
Results
Even more horizontal flow field modelling | Frank Platzek, Regina Patzwahl
04/12/2015 Page 39
JOKER
measure
ments
…and the values of the playing
cards are unknown
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Conclusion
Even more horizontal flow field modelling | Frank Platzek, Regina Patzwahl
04/12/2015 Page 40
JOKER?
JOKER
Measure
ments
Very sensitive test case, on the border of model validity:
• point of flow separation
• location and orientation of the eddies
In particular for the modified geometry, where we also lack validation
data from the field.
=> a challenge for a numerical model(ler)
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Bundesanstalt für Wasserbau
76187 Karlsruhe, Germany
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Thank YOU for your attention
We want to thank for support:
The hydraulic lab (B. Hentschel) at BAW
Colleagues from W2 and W5 at BAW
Colleagues from Deltares
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A new channel mouth geometry
Even more horizontal flow field modelling | Frank Platzek, Regina Patzwahl
04/12/2015 Page 42
Analysis of As-is
state
Numerical model Scale model
Numerical model
Telemac3D
Investigation of possible
geometry variations:
Variant X
Fine-tuning of variant X
In respect to transport:
Xplus
Numerical model
Telemac2D
(J. Becker 2014)
Fine tuning of
variant Xplus in
respect to
hydraulic
matters:
Xplusplus
Xplus
Variant X
Xplusplus