Carlo_Vadehavsforskning 2013_v1

Trilateral desk study on the sedimentary functioning of
tidal inlet systems in the Wadden Sea
Carlo Sørensen1), Søren Knudsen1), Karsten Bolding2) and Thorsten Piontkowitz1)
1) Danish
2)
Coastal Authority, DK-7620 Lemvig (cas@kyst.dk)
Bolding & Burchard ApS., DK-5466 Asperup (karsten@bolding-burchard.com)
Wadden Sea Research 2013 22. May 2013, Esbjerg
The Task Group CLIMATE (TG-C)
- Ministerium für Landwirtschaft, Umwelt und
ländliche Räume des Landes Schleswig-Holstein
- Innenministerium des Landes Schleswig-Holstein
- Niedersächsisches Ministerium für Ernährung, Landwirtschaft,
Verbraucherschutz und Landesentwicklung
TASK I. Increase the linkage between climate change
and coastal protection, nature protection, the
adaptability of the Wadden Sea ecosystem and
spatial planning
→ Prepara$on of a Climate Change Adaptation
Strategy
- Nationalparkverwaltung Niedersächsisches Wattenmeer
TASK II. Initiate a trilateral study on sustainable
solutions to balance the expected sediment deficits
- Ministry of Infrastructure and the Environment
- Province of Groningen
- Naturstyrelsen
- Kystdirektoratet
- Esbjerg Kommune
→ Performance of a trilateral desk study on the
sedimentary functioning of tidal inlet systems
TASK III. Initiate a project developing model spatial
plans for pilot sites in the Wadden Sea region with
the aim of developing a practicable spatial planning
methodology to meet the challenges of climate
change
→ Performance of a trilateral workshop on
climate change adaptation in spatial planning
Chair: Kystdirektoratet
Secretary: Common Wadden Sea Secretariat
The future challenge
Sea level rise, storm surge and ground water
www.nature.com
Climate change and important aspects
Safety of the
inhabitants
Enhanced sea level
rise and storm
surges
Climate change
Precipitation
patterns
Temperature
Maintenance of the
natural structures
and functions
WADDEN SEA
RESEARCH
National
Conservation of the
characteristic
biodiversity
Maintenance of the
scenic qualities of
the landscape
Trilateral
Long-term impact and tipping points
Geomorphological sedimentation processes
Waning barriers and ebb-tidal deltas
Photo: Norbert Hecker
Drowning intertidal flats and deteriorating
salt marshes
Photo: Norbert Hecker
Trilateral desk study
Main tasks on behalf of the entire
Wadden Sea area:
(i)
Re-evaluation of existing data
given the uncertainties in the
measurements;
(ii)
Evaluation of conceptual models
that aim at understanding and
predicting sedimentary behavior
of sediment sharing systems;
(iii)
(iv)
Determination which model to use
(e.g. ASMITA) and the scale on
which these models should be
used;
Modeling tidal basins with chosen
model(s) (now and in the future).
Partners:
•
The Ministry of Economic Affairs,
Agriculture and Innovation and the
Ministry of Infrastructure and the
Environment, The Netherlands
(Deltaprogramme Wadden Area)
•
Deltares (Secretary)
•
Danish Coastal Authority, Denmark, KU;
•
Min. für Landwirtschaft, Umwelt und
ländliche Raume des Landes SchleswigHolstein, Germany (Schleswig-Holstein);
•
Nds. Landesbetrieb für Wasserwirtschaft,
Küsten- und Naturschutz, Germany
(Lower Saxony);
Danish focus
Safety of the
inhabitants
•Quantification of the current and recent net gain of sediment (sediment budget) in
front of Wadden Sea Islands and on shoals and ebb-tidal deltas and of the potential
sources (Sylt, Germany and Skallingen/Jutland West Coast);
• Modeling of sediment transport changes, sediment redistribution and
morphological change under different SLR-scenarios;
• A better understanding of current large-scale tidal inlet dynamics and supposed
inlet and tidal flats responses to SLR and climate deterioration;
• ‘Making room’ for new tidal marsh formation under different SLR-scenarios;
• How will future morphological change affect surge levels and waves in the Wadden
Sea and the safety levels of the inhabitants?
• How do we best focus our measuring and modeling efforts in the coming years in
relation to CC issues?
Safety levels
Jensen (2011)
Dike strength
Safety level
of dikes
Wave load
Geometry
Execution
Extreme
water levels
Flood protection
in
the Wadden Sea region
Overview of dikes
Situation plan
Cross section
Data sheet
Photos
Morphological change
Bathymetry ’2003’
The Wadden Sea Front (WSF)
Surveys: 1970, 1998, 2003, 2007 and 2011.
The area west of Skallingen has been surveyed
22 times in the period 1969-1998 and again in
2002, 2006 and 2010
Knudsen, S.B. and Sørensen, C. (2013). The Danish Wadden Sea Front - the North Sea
Coast from Blåvandshuk to the German border. Danish Coastal Authority. Technical
report. (draft)
Bathymetric charts (WSF)
1970
1998
2011
Coastline change (WSF)
Coastline change (WSF)
Sediment budget (WSF)
Trilateral project
Long-term Model
Position papers (NL, D, DK)
Knowledge sharing and exchange
Data availability
Long-term modeling
Financing – a challenge!
Annual Hydrog.
& Morphol.
Modelimprovement
Annual
assessement
studies on
selected cases
Trilateral project modeling
•ASMITA (NL, D, DK)
•GETM (DK, SH)
GETM
Thank you!
Photo: Norbert Hecker