Hans Burchard Leibniz Institute for Baltic Sea Research Warnemünde, Germany Cooperation: Thomas Badewien 1 , Johannes Becherer 2 , Götz Flöser 3 , Ulf Gräwe 2 , Volker Mohrholz 2 , Rolf Riethmüller 3 , Joanna Staneva 3 , Lars Umlauf 2 1. 1. University Oldenburg, Germany 2. 2. Leibniz Institute for Baltic Sea Research Warnemünde, Germany 3. 3. Helmholtz Center Geesthacht, Institute for Coastal Research, Germany Modelling the turbulent Wadden Sea: What’s needed most
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Hans Burchard Leibniz Institute for Baltic Sea Research Warnemünde , Germany
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Hans BurchardLeibniz Institute for Baltic Sea Research Warnemünde, Germany
Cooperation: Thomas Badewien1, Johannes Becherer2, Götz Flöser3, Ulf Gräwe2, Volker Mohrholz2,
Rolf Riethmüller3, Joanna Staneva3, Lars Umlauf2
1. 1. University Oldenburg, Germany2. 2. Leibniz Institute for Baltic Sea Research Warnemünde, Germany3. 3. Helmholtz Center Geesthacht, Institute for Coastal Research, Germany
Modelling the turbulent Wadden Sea:
What’s needed most
Warming Precipitation
Weak tidal mixing: vertically stratified
Strong tidal mixing: horizontally stratified
Land Ocean
Downward surface buoyancy flux
Thermohaline estuarine circulation
Sea bed
River?
The Wadden Sea circulation in a nutshell
Compare to:
Climatology: Salinity difference HW-NW
Burchard et al. (JPO 2008)
Climatology: Temperature difference HW-LW
Burchard et al. (JPO 2008)
Climatology: Density difference HW-LW
Burchard et al. (JPO 2008)
MacCready & Geyer (2010) after Jay & Musiak (1994)
Longitudinal density gradients & tidal oscillations lead to:
e.g., tidal straining
75% level
75% level
Does this happen in nature?
Becherer et al. (in prep.)
75% level flood ebb
Thermohaline estuarine circulation (observed)
Becherer et al. (in prep.)
Modelling the impactof density gradientson SPM transport
With density differences
V /
km3
Burchard et al. (JPO 2008)
Without density differences
Relative SPM content
Relative SPM content
V
/ km
3
Sylt (D)
Romo (DK)
Seasonality of tidal forcing
Müller et al. (in prep.)
Gräwe et al. (in prep.)
How does this affect sediment transport due to tidal asymmetries (M4)?