smolders the 3 d unstructured scaldis model

SCALDIS : A 3D Hydrodynamic

model of the tidal Scheldt

05/10/2015

Belgian Hydraulics Day 2015

Smolders, S.; Vanlede, J.; Maximova, T.

Introduction

• Project “Integrated Plan Upper Sea Scheldt”

• Improve navigability of the Upper Sea Scheldt

• Without negative effects on nature and safety against flooding

• Integrated within Flemish-Dutch research programme "Agenda for the Future“(2014-2017)

Need for a hydrodynamics and sediment transport model that covers the entire tidally influenced zone of the Scheldt Estuary and the mouth area, and that has sufficient resolution in the upstream part.

05/10/2015 Belgian Hydraulics Day 2

Unstructured mesh

• Existing NEVLA model (SIMONA) has structured

mesh and lacks high spatial resolution in upper part of

the estuary,

• Need for a new schematisation

• Increase the resolution in the upstream part

• Keep one model domain for practical reasons (so

no nesting or domain decomposition) and

• With an acceptable computational cost

• Move to an Unstructured Grid

• Choice for TELEMAC 3D platform

3 Belgian Hydraulics Day 05/10/2015

Model domain


Model domain includes CRT

and FCA

5

Lippenbroek

Belgian Hydraulics Day 05/10/2015

NEVLA

6

Bergenmeersen


NEVLA

7

Bergenmeersen


SCALDIS


Bergenmeersen

Model Comparison

NEVLA SCALDIS

Model Domain

Grid type Structured Unstructured

Software platform SIMONA TELEMAC

Resolution @Antwerp ~65m ~25m

Resolution @Ghent ~20m ~7m

Calibrated HD

Mud transport LTV-Slib (Delwaq) Foreseen

Sand transport Delft3D Foreseen


Extended model domain

11

• Possibility to include scenarios in the mouth area

• Model boundary far enough from mouth area WS

• Necessary to include Eastern Scheldt in model

domain


Grid & Bathymetry

12

• 200 to 500 m in North Sea and mouth area

• 200 m in Eastern Scheldt

• 120 m in Western Scheldt

• 7 m in upper Sea Scheldt to 5 m at upstream boundaries

+460,000 nodes in the horizontal

3D in 5 sigma layers

+2,300,000 nodes in total

• Bathymetry from 2013-2014


Boundary conditions

downstream

13

• Derived from CSM-ZUNO modeling train

• CSMv5 – Continental Shelf Model • driven at ocean boundaries by astronomical water levels (tidal

components: M2, S2, N2, K2, O1, K1, Q1, P1, NU2, L2, SA)

• ZUNOv3 – Zuidelijke Noordzee Model • nested in CSM

• HIRLAM winddata

• ZUNO incl Salinity

• Run for 2013


Boundary conditions upstream

14

• 8 discharge boundaries with daily

averaged discharge values


Channel Bath

Channel Ghent-Terneuzen

Dender Merelbeke

Zenne Dijle

Grote Nete

Kleine Nete

Calculation time

15

• Dependant on:

• Number of parallel processors used

• Including tracers or not

• Activation of Culverts for Controlled Reduced Tide

areas and Flood Control Areas

• Fastest: 128 processors, 1 active tracer, no culverts

1 day simulated in 1 hour (x24 speed-up) or

0,001302 seconds per time step per processor


Calibration strategy

16

• Focus on data 2013

• Water Levels

• Timeseries + Extrema

• Harmonic Components

• Normal conditions + Storm dec 2013

• Fluxes

• Velocities

• Sailed ADCP measurements

• Fixed Velocity Measurements


Calibration strategy

17

• Data availability 2013

• 48 WL stations (10’ TS)

• 58 sailed ADCP campaigns (2005-2014)

• 11 salinity stations (10’ TS)

• 29 discharge transects

• Cost Function

• Water levels 50%

• ADCP velocities 40%

• Cross-sectionally averaged Flux 10%


Bottom Roughness

18

• The modeled horizontal and vertical tide is calibrated

by adapting the bottom roughness, which is

represented by Manning’s equation for the

dimensionless friction coefficient


Model Skill Assessment

• Vertical Tide

• WL History

• WL Harmonic Analysis

• Horizontal Tide

• Point velocities (dug-in ADCP’s)

• Sailed ADCP transects

• Q measurements

• Assessed using VIMM toolbox (in-house development FHR)

• +5000 figures

• +40 tables


WL History Vlissingen


WL History Antwerpen


WL History Schelle


RMSE Water levels


M2 Amplitude


M2 Phase


Phase shift 2M2-M4


Velocity: shallow ADCP


Model performance

ADCP Waarde

28

Max Ebb Max Flood


Model performance

ADCP Liefkenshoek

29

Max Ebb Max Flood


Model performance

ADCP Schoonaarde

30

Max Ebb Max Flood


Model Performance

Q Boom


Model Application

Hydrodynamics

3D TELEMAC model

Sand

Transport

model

= Sisyphe

Mud

Transport

model

= DELWAQ

(+ Sisyphe)

Integrated

ecosystem

modeling

OMES model

for primary

production

Dispersion

coefficients


05/10/2015 33

Thank you for your attention

Belgian Hydraulics Day

smolders the 3 d unstructured scaldis model

Engineering