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Safety: Example Schelde
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The SIGMAPLAN 1977
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Antwerpen : overschrijdingslijn hoogwaterstanden
3697223
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1 10 100 1,000 10,000
Terugkeerperiode (jaar)
Data 61-75 (Theuns) Data 71-90 (Claessens) Data 71-97 (Taverniers) Prognose (2050) Prognose (2100)
Upgrade of safety level is necessary
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GENT
BOOM
LIERTEMSE
ZEMST
DUFFELITEGEM
SCHELLE
LOKEREN
VIERSEL
MECHELEN
WETTEREN
OOSTERLO
WERCHTER
ANTWERPEN
VILVOORDE
ZANDVLIET
DENDERMONDE
GROBBENDONK
The SIGMAPLAN 1977
a) Heithening and strengthening dikesb) aanleg gecontroleerde overstromingsgebiedenc) bouw stormvloedkering te Oosterweel
zone 1 : 11,00 m TAW
zone 2 : 8,35 m TAW
zone 3 : 8,00 m TAW
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LIERTEMSE
ZEMST
DUFFELITEGEM
SCHELLE
LOKEREN
VIERSEL
MECHELEN
WETTEREN
OOSTERLO
WERCHTER
ANTWERPEN
VILVOORDE
ZANDVLIET
DENDERMONDE
GROBBENDONK
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LIERTEMSE
ZEMST
DUFFELITEGEM
SCHELLE
LOKEREN
VIERSEL
MECHELEN
WETTEREN
OOSTERLO
WERCHTER
ANTWERPEN
VILVOORDE
ZANDVLIET
DENDERMONDE
GROBBENDONK
The SIGMAPLAN 1977
a) verhogen en verzwaren waterkeringenb) Construction of inundation areasc) bouw stormvloedkering te Oosterweel
KBR
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The SIGMAPLAN 1977
Zeeschelde
Durme
Tielrodebroek
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BOOM
LIERTEMSE
ZEMST
DUFFELITEGEM
SCHELLE
LOKEREN
VIERSEL
MECHELEN
WETTEREN
OOSTERLO
WERCHTER
ANTWERPEN
VILVOORDE
ZANDVLIET
DENDERMONDE
GROBBENDONK
The SIGMAPLAN 1977
a) verhogen en verzwaren waterkeringenb) aanleg gecontroleerde overstromingsgebiedenc) Construction of stormsurge barrier at Oosterweel
KBR
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90 m 90 m
54 m 54 m 54 m
hefdeuren
segmentkleppen
120 m
The SIGMAPLAN 19772003 : 1.000.000.000 EUR
123 m
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Hoe het SIGMAPLAN actualiseren ?
Nete’s
Dijle
Zenne
RupelDurme
Zeeschelde
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effect GOG op HW
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0 50 100 150
afstand in km
as is
to be
GentVlissingen Hansweert Antwerpen Dendermonde
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Ecology: CRT
- Introducing estuarine ecosystem
- Tidal regime in area
- Two times a day!
Ring Dike Lowered FCA dike
FCA estuary
Outlet
polder
Concept FCA – CRT safety, ecology and a new ecosystem
Safety: FCA
- Lowered dike stretch
- Critical tides: whole storage capacity
- Only few times/year!
Ring Dike Lowered FCA dike
CRT estuary
Outlet
Inlet
polder
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Pilot project Lippenbroek
10 ha of tidal nature developping: May 2008
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date
level (m TAW)
Schelde (De Plaat)
Lippenbroek
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1
2
3
4
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7/04 12/04 17/04 22/04 27/04 2/05 7/05
date
level (m TAW)
Lippenbroek
Schelde (De Plaat)
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1
2
3
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7/04 12/04 17/04 22/04 27/04 2/05 7/05
date
level (m TAW)
Lippenbroek
Schelde (De Plaat)
Introducing macrotidal regime
Reduction of high water level by 3 meter No reduction of spring – neap variation
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Lippenbroek 16-05-06
0
25
50
75
100
125
150
175
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time (hour)
INFLOW OUTFLOW
Water quality: oxygen
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“reverse tidal pumping”
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Time (hrs)
Water level (m TAW)
spring neap mean
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Alternative disposal strategyAlternative disposal strategy