Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.
FISH MIGRATION RIVER AFSLUITDIJK (FMR)
Hydrodynamic evaluation of the design using D-Flow FM (3D)
in z-layer mode, with D-...
© Arcadis 2017
Content
I. Why?
II. Purpose of the investigations
III. System, steering and schematization
IV. Hydrodynamic...
© Arcadis 2017
I. Why?
The Dutch icon Afsluitdijk, constructed
in 1932, has a length of 32.5 km and
created a rigid separa...
© Arcadis 2017
II. Purpose of the investigations
Testing hydraulic design:
▪ Effect on existing discharge gates (not prese...
© Arcadis 2017
IIISystem Stilling basin
Inner dis-
charge canal
Waddensea
IJssellake
Closure gate
IJssellake
Fish entrance...
© Arcadis 2017
III Schematisation of FMR
Passage gate
with three
openings, a fish
passage and a
safety closure
gate
Test /...
© Arcadis 2017
III Schematisation
of the FMR
Western bight
Closure gate with
double point doors,
flaps and fish
passages
© Arcadis 2017
1
2
3
4
5
6
7
8
III Schematisation
of the FMR
Schematisation with resistance on
the straight sections.
Bigh...
© Arcadis 2017
III Steering of the Fish Migration River
• The closure gate is the prime passive steering instrument. Autom...
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
-30 -10 10 30 50 70 90 110 130
Percentageofexceedance
Water level difference b...
© Arcadis 2017
IV Hydrodynamic FMR investigation
Tool:
2D depth averaged and 3D Z-layer model of FMR
(D-Flow FM), temperat...
Conservative: IJssellake level = NAP – 0,4 m.
Long flood and short ebb transformed towards short flood and long ebb.
Mean ...
Mean tide
Waterlevel[mNAP] Water levels
Time [hrs.]
Mean tide
Discharge[m3/s}
Discharges
Time [hrs.]
Discharges short flood, long ebb
Maximum inflow mean tide: inlet (28 m3/s) passage gate (24 m3/s) closure gate ( 8 m3/s) F...
© Arcadis 2017
IV System volumes FMR
Neap tide
Inlet Closure gate Tidal storage
340 129
211411 200
1.21 1.55
Mean tide
Inl...
© Arcadis 2017
IV System volumes FMR
Neap tide
Inlet Closure gate Tidal storage
281 104
177552 374
1.96 3.60
Mean tide
Inl...
Mean tides
Day
Mean tide
Day
Levels
Distance along FMR
Salinity [PSU]
Salinity intrusion (0.4 PSU) as a function of time
Time (hours)
DistancealongFMR[m]
Mean tide
Day
Mean tide,
resistance in bights
Mean tide
Distance along FMR
DayDayLevels
Flow vel.[m/s]
Levels
Day
Levels
Distance along FMR
Turbulence
[10-3 m2/s2]
© Arcadis 2017
V Conclusions hydrodynamics FMR
1. The FMR is not operational during storm surges. The closure level of NAP...
© Arcadis 2017
IV Conclusions hydrodynamics FMR (continued)
5. The FMR is well manageable
6. There is a strict separation ...
© Arcadis 2017
V Overall end conclusion
The FMR does what we want. It works on the
tidal engine is well controlable and sa...
© Arcadis 2017
Arcadis
Improving quality of life
Upcoming SlideShare
Loading in …5
×

DSD-INT 2018 Fish migration River Afsluitdijk (FMR) - Hydrodynamic evaluation of the design using D-Flow FM (3D) in z-layer mode, with D-Real Time Control (RTC) - van Banning

39 views

Published on

Presentation by Gijs van Banning, Arcadis, The Netherlands, at the Delft3D - User Days (Day 2: Hydrodynamics), during Delft Software Days - Edition 2018. Tuesday, 13 November 2018, Delft.

Published in: Software
  • Be the first to comment

  • Be the first to like this

DSD-INT 2018 Fish migration River Afsluitdijk (FMR) - Hydrodynamic evaluation of the design using D-Flow FM (3D) in z-layer mode, with D-Real Time Control (RTC) - van Banning

  1. 1. FISH MIGRATION RIVER AFSLUITDIJK (FMR) Hydrodynamic evaluation of the design using D-Flow FM (3D) in z-layer mode, with D-Real Time Control (RTC) November 13, 2018
  2. 2. © Arcadis 2017 Content I. Why? II. Purpose of the investigations III. System, steering and schematization IV. Hydrodynamic Simulations V. Conclusions Hydrodynamics
  3. 3. © Arcadis 2017 I. Why? The Dutch icon Afsluitdijk, constructed in 1932, has a length of 32.5 km and created a rigid separation between salt and fresh water. The IJssellake contains the largest buffer of fresh water in Europe, the government wants to keep that buffer. The passage of fish through the Afsluitdijk was rigidly stopped in 1932. For ecological reasons the government wants to open the Afsluitdijk for fish, but keep it closed for salt water. For that reason the idea of the Fish Migration River was born.
  4. 4. © Arcadis 2017 II. Purpose of the investigations Testing hydraulic design: ▪ Effect on existing discharge gates (not presented here) ▪ Fresh water outflow in stilling basin (not presented here) ▪ Salt / Fresh separation ▪ Functioning and morphology Using D-Flow FM module in 3D z-layer mode with salinity and temperature and K-eps turbulence closure model, also using the D-Real Time Control module (RTC). ▪ Gridcell sizes varying from 2 by 2 till 1 by 0.5 meter ▪ 6 layers in the vertical
  5. 5. © Arcadis 2017 IIISystem Stilling basin Inner dis- charge canal Waddensea IJssellake Closure gate IJssellake Fish entrances 2 shiplocks Test & observation location Bird Island Passage gate
  6. 6. © Arcadis 2017 III Schematisation of FMR Passage gate with three openings, a fish passage and a safety closure gate Test / observation location
  7. 7. © Arcadis 2017 III Schematisation of the FMR Western bight Closure gate with double point doors, flaps and fish passages
  8. 8. © Arcadis 2017 1 2 3 4 5 6 7 8 III Schematisation of the FMR Schematisation with resistance on the straight sections. Bight numbering
  9. 9. © Arcadis 2017 III Steering of the Fish Migration River • The closure gate is the prime passive steering instrument. Automatic closing of point doors during flood and automatic opening during ebb. • However, during flood, one fish passages and the paddles remain open, to let the tide come in till the closure gate. • Additional fine tuning with the openings in the passage gate is possible to limit the ebb. • If salinity intrusion threatens, confirmed by salt observations 300 m before the closure gate, all is closed in the closure gate, also the flaps and fish passage.
  10. 10. 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% -30 -10 10 30 50 70 90 110 130 Percentageofexceedance Water level difference between Ijssellake and Waddensea during low water in Kornwerderzand, years 2008 and 2009 [cm] Passage gate closed because insufficient discharge capacity during ebb. Closure gate closed as well. Area where the FMR functions but where the ebb is limited because of too high velocities Safety gate closed because of storm surge Simulations1and10 Simulation2 Simulations3and4 Simulation5 Simulations6,7,8and9 Normal functioning of the FMR
  11. 11. © Arcadis 2017 IV Hydrodynamic FMR investigation Tool: 2D depth averaged and 3D Z-layer model of FMR (D-Flow FM), temperature, salinity, K-eps turbulence model and Thatcher Harlemann boundary conditions. Boundary conditions water levels at both sides. Simulations: Iteration of series of alternatives, using system engineering. Test: Evaluation of results
  12. 12. Conservative: IJssellake level = NAP – 0,4 m. Long flood and short ebb transformed towards short flood and long ebb. Mean tide Waterlevel[mNAP] Water levels Time [hrs.]
  13. 13. Mean tide Waterlevel[mNAP] Water levels Time [hrs.]
  14. 14. Mean tide Discharge[m3/s} Discharges Time [hrs.]
  15. 15. Discharges short flood, long ebb Maximum inflow mean tide: inlet (28 m3/s) passage gate (24 m3/s) closure gate ( 8 m3/s) Fish passage (4 m3/s) Maximum outflow mean tide: inlet (26 m3/s) passage gate (24 m3/s) closure gate (24 m3/s) Fish passage (2 m3/s) Mean tide Discharge[m3/s} Discharges Time [hrs.]
  16. 16. © Arcadis 2017 IV System volumes FMR Neap tide Inlet Closure gate Tidal storage 340 129 211411 200 1.21 1.55 Mean tide Inlet Closure gate Tidal storage 375 128 247526 277 1.40 2.16 Spring tide Inlet Closure gate Tidal storage 375 117 258584 323 1.56 2.76 Volumes in 103 m3 IJssellake water level NAP -0.4 m
  17. 17. © Arcadis 2017 IV System volumes FMR Neap tide Inlet Closure gate Tidal storage 281 104 177552 374 1.96 3.60 Mean tide Inlet Closure gate Tidal storage 317 105 212655 440 2.07 4.19 Spring tide Inlet Closure gate Tidal storage 324 99 225709 479 2.19 4.85 Volumes in 103 m3 IJssellake water level NAP -0.2 m
  18. 18. Mean tides Day
  19. 19. Mean tide Day Levels Distance along FMR Salinity [PSU]
  20. 20. Salinity intrusion (0.4 PSU) as a function of time Time (hours) DistancealongFMR[m]
  21. 21. Mean tide Day
  22. 22. Mean tide, resistance in bights Mean tide Distance along FMR DayDayLevels Flow vel.[m/s] Levels
  23. 23. Day Levels Distance along FMR Turbulence [10-3 m2/s2]
  24. 24. © Arcadis 2017 V Conclusions hydrodynamics FMR 1. The FMR is not operational during storm surges. The closure level of NAP + 1.5 m is exceeded 1% of the time (3.7 days / year). 2. Based on the water levels near Kornwerderzand it is approximately 35 % of the time ebb and 65% of the time flood. For the FMR it is approximately 56% of the time ebb and 38% of the time flood. 3. The average discharge through the FMR amounts ~17.6 m3/s during ebb(56 % of the time). During flood this number is ~15.2 m3/s (38 % of the time). 4. In one tide, on average ~455,000 m3 water exits the FMR during ebb and ~278,000 m3 water comes in during flood. Nett each tide ~177,000 m3 water towards the Waddensea (ebb). Nett each tide ~110,000 m3 water towards IJssellake (flood).
  25. 25. © Arcadis 2017 IV Conclusions hydrodynamics FMR (continued) 5. The FMR is well manageable 6. There is a strict separation between salt and fresh water. 7. The FMR is on average 90% of the time operational. 8. On the long run, SLR will reduce the effectiveness of the FMR. The average water level difference between Waddensea and IJssellake increases, which reduces the ability to flush the FMR during ebb. 9. Morphology: • The bights are stable. • No siltation is expected. • Bottom protection is needed where the FMR is narrowed. • Too high velocities during ebb, should be avoided by limiting theflow through the passage gate.
  26. 26. © Arcadis 2017 V Overall end conclusion The FMR does what we want. It works on the tidal engine is well controlable and satisfies clients wishes and demands.
  27. 27. © Arcadis 2017 Arcadis Improving quality of life

×