Delft3D Zeebrugge model

Delft3D Zeebrugge model

Bart De Maerschalck, Joris Vanlede, Arvid Dujardin,

Rosalia Delgado, Marc Willems, Katrien Eloot

Delft, 1/11/2011

Assessment tool for safety and

accessibility studies within the

framework of an integral approach

Outline

• Intro: Port of Zeebrugge

• Project description

• Numerical model

• Objectives

• Set up

• Current situation

• Example of case study

• Conclusions and ongoing research

2

Intro: Port of Zeebrugge

• 2nd port of Belgium

• Nr. of ships 2010: 8.863

• Total throughput: 49,6 mil. Tonnes

• Container shipping: 2.5 mil. TEU

• Transport of new cars: 1.6 mil.

• Energy harbour:

• LNG terminal

• 15% of market Western Europe

• Rapidly growing

3

4


Source: www.portofzeebrugge.be

5


Flood


6


Flood

EbbSource: www.portofzeebrugge.be

7


Siltation


Intro: Flood and ebb currents

• Dredging activities Flemish Government:

• Deepening navigation channel and outer port

(CDNB)

• Ship draught up till 16m

• But: strong cross currents near port entrance:

• Entrance of tall ships: inbound sailing window

limited to couple of hours

• Containerships: max cross flow 2 kn

• LNG carriers: max cross flow 1.5 kn

8

Intro: Siltation

• Port of Zeebrugge: Location ~ centre of a turbidity

maximum

• Tidally driven water exchange through port entrance

• Siltation of the outer port

• Continuously dredging required: > 4 mil. Tons/year

9

Seasonal averages of SPM surface concentration left: summer, right: winter, derived from 362 SeaWiFS images (1997-2004), Source: M. Fettweis (2006), MOMO activiteitsrapport 4, MOMO/2/MF/200606/NL/AR/4

Project: optimisation of maritime

access

• Initiated in 2009 under the request of the

Maritime Access Division (Flemish Government, Department

of Mobility and Public Works)

• Safety and Accessibility

• Development of integral approach for future

assessment studies:

• Physical model• Ver. Scale: 1/100 / Hor. Scale: 1/300

• Simulator studies• Real time / Fast time

• Numerical model

10

Numerical model: objectives

• Assessment tool:

• Cross currents, water exchange

• High resolution

• Flexible: potential harbour extensions

• Input for ship manoeuvring simulators:

• Depth averaged (nautical equivalent)

vector maps

• Input for physical model:

• Guidance for the steering of the boundary

conditions

11

• Harbour extension and mitigation

assessments


12


• Input for simulator studies

13

Numerical model



14

Numerical model



Numerical model

Fast-time simulator

(autopilot)

Real-time simulator



16

Numerical model

Fast-time simulator

(autopilot)

Real-time simulator


17

• Input physical model


18



19



20


Numerical model: Set up

21

• 3D model, 6 sigma-layers

• Δt = 3s

• 185.000 cells:• 10% inside the port

• 25% within the domain of interest

• 25% not active

• Resolution: 30m – 200m

• Boundary conditions:

• One-way nested in larger LTV-model (nested in ZuNo)

• SW: Current

• NW: Riemann

• NE: Current

Numerical model: Set up

• Bottom roughness: Manning, spatially varying

• Wall roughness: Partial slip, R0=0.15m

• HLES: relaxation time 15min.

• Background visc.: 1m²/s, uniform

• Vertival visc.: k-ϵ

22

Numerical Model: Set up

23

Numerical Model: Set up

24

Numerical Model: Calibration

• In situ measurements:

• Section ranges

• Fixed ADCP

• Meetnet Vlaamse Banken

• Measurement piles

• Buoys

25

Numerical model: Validation WL

Reference: Measured Start:

24/10/2006

0:00

Tested: Z222; Z223; Z224 Stop:

4/11/2006

16:30

Complete

TimeSeriesHW LW

BIAS RMSE0 BIAS RMSE0 BIAS RMSE0 BIAS RMSE0 BIAS RMSE0

[m] [m] [m] [m] [min] [min] [m] [m] [min] [min]

Wandelaar 0,05 0,26 0,33 0,20 -2 13 -0,05 0,17 -15 19

A2B-boei -0,01 0,26 0,30 0,21 0 10 -0,08 0,10 -21 18

Zeebrugge -0,02 0,27 0,19 0,21 4 20 -0,13 0,18 -16 16

Bol van Knokke -0,03 0,25 0,14 0,21 8 15 -0,15 0,14 -9 16

26

Numerical model:

Validation Currents

Reference: Measured

Tested: Z222; Z223; Z224

magnitude direction

BIAS [m/s] RMSE [m/s] BIAS [°] RMSE [°]

FIXED ADCP:

(start: 20/12/2006 12:00; stop: 23/12/2006 0:30)

Wandelaar (MOW0 - MVB) 0,02 0,12 2 64

Bol van Heist (MOW3 - MVB) 0,09 0,19 -4 55

A2B-boei (MOW1 - IMDC) top 0,07 0,17 -3 48

A2B-boei (MOW1 - IMDC) bottom 0,00 0,13 -2 50

ALL 0,05 0,16 -1 58

ADCP TRANSECTS:

Veremans (21/06/2001) 0,06 0,22 15 78

Ingang haven - doodtij (07/08/2007) 0,01 0,11 13 65

Wielingen (03/08/2007) 0,12 0,23 5 17

ALL 0,06 0,19 11 59

27

Results Current situation

28

Cross flow along the trajectory

29

Inbound sailing window

30

Case study: Artificial island

31

Artificial island

32

Inbound sailing window

33

Cross flow in front of port entrance

34

Conclusions and ongoing

research

• Strong flood and ebb flows -> limited access

for tall ships

• Integral assessment tools are developed:

Numerical model, physical model, simulators

• Ongoing research:

• Analysis of a large number of potential

future harbour configurations

• Calibration of the physical model

• Extension of the numerical model with a

sediment transport model

35

Delft3D Zeebrugge model

Documents

Transcript of Delft3D Zeebrugge model