Sigmaplan ‘Safety & Ecology’ Creating a sustainable estuary of the Schelde Patrik Peeters 18/05/10.

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Presentation transcript:

Sigmaplan ‘Safety & Ecology’ Creating a sustainable estuary of the Schelde Patrik Peeters 18/05/10

355 km km 2 10,5 milion people Estuary of the Schelde

Storm surge in 1976

Schelde Durme Sigmaplan anno Dike strengthening & heightening - Flood Control Area (FCA)

ScheldeFCA Ring dikeLowered levee Working principle of a FCA

90 m 54 m 120 m 123 m Sigmaplan anno Flood barrier

Sigmaplan anno 2005 No longer 1 flood protection level – Flood risk assessment Taking into account possible breach formation Combination of dike strengthening and FCA Based on a SCBA

Water management today: limit the damage Water level 1. Probability 2. Flood modeling 3. Damage calculations 4. Risk = Σ Probability x Damage Flemish Risk Methodology

Sigmaplan anno 2005 Adressing ecological needs System approach Habitat approach Species approach More space for the estuary Non-tidal wetlands Combining FCA with agriculture non-tidal wetland a Controlled Reduced Tide (CRT)

Pilot Project LIPPENBROEK Flood Control Area (FCA) with a Controlled Reduced Tide (CRT) Ring dike Overflow dike Inlet structure (high sill) Outlet culvert (low sill, flapped) Semi-diurnal water exchange Creation of intertidal habitat with inundation characteristics similar to natural conditions, ie. profound springtide/neap tide cycle

Outlet (low sill) and inlet (high sill)

Springtide/neap tide cylce Reduced tide Stagnante phase

Pilot Project LIPPENBROEK INLET (CRT side) OUTLET (river side) OUTLET (CRT side) Overflow dike

Freshwater Intertidal Habitat CREEK RESERVOIR SHALLOW POOL ready for colonisation, nutrient cycling, …

Discharge measurements At the inlet Rectangular section Sharp-crested weir

At the inlet By ADCP Head-discharge relations Discharge measurements

At the outlet Rectangular section Broad-crested weir Trash rack By ADCP Validation of continuously measured flow velocities and water levels Discharge measurements

At the outlet Discharge measurements

Sediment sampling Each in- and outflow At in- and outlet Tidal sampling SSC in laboratory (mg/l) At distinguished moments: detailed sampling Turbidity measurements (NTU)

Sediment sampling Relations between Q (m³/s), SSC (mg/l) et turbidity (NTU) Eg. at the inlet:

Water and sediment balance

Sediment balance

Sedimentation pattern Measurement of elevation changes by SET SET: Surface Elevation Tables

Yearly elevation change Elevation change as a function of tidal inundation frequency (average: 2-3 mm/year)

Improving connectivity Between estuary and FCA, non-tidal wetlands, tributaries, … Enhancing (fish) migration Fish passages Fish-friendlier tide gate designs Culvert adjustments

Fish immigration Fish emigration INLET OUTLET Improving connectivity

Tide gate of outlet Lippenbroek 1.80m x 1.80m Double hinged from above Small opening at low flows Turbulent at high flows, but with sufficient opening

Side-hinged “Pet Door” Mono-hinged “Pet Door”

Thank you for your attention Suggestions, questions, …