4.3 Article Proceedings Paper

The Wadden Sea in transition - consequences of sea level rise

Journal

OCEAN DYNAMICS
Volume 68, Issue 1, Pages 131-151

Publisher

SPRINGER HEIDELBERG
DOI: 10.1007/s10236-017-1117-5

Keywords

Sea level rise; Morphodynamic simulation; Wadden Sea

Categories

Funding

  1. Schleswig-Holstein Ministry of Energy, Agriculture, the Environment and Rural Areas
  2. German Research Foundation under the umbrella of the Priority Programme [BU 1199/21-1, SPP 1889]

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The impact of sea level rise (SLR) on the future morphological development of the Wadden Sea (North Sea) is investigated by means of extensive process-resolving numerical simulations. A new sediment and morphodynamic module was implemented in the well-established 3D circulation model GETM. A number of different validations are presented, ranging from an idealized 1D channel over a semi-idealized 2D Wadden Sea basin to a fully coupled realistic 40-year hindcast without morphological amplification of the Sylt-Romobight, a semi-enclosed subsystem of the Wadden Sea. Based on the results of the hindcast, four distinct future scenarios covering the period 2010-2100 are simulated. While these scenarios differ in the strength of SLR and wind forcing, they also account for an expected increase of tidal range over the coming century. The results of the future projections indicate a transition from a tidal-flat-dominated system toward a lagoon-like system, in which large fractions of the Sylt-Romobight will remain permanently covered by water. This has potentially dramatic implications for the unique ecosystem of the Wadden Sea. Although the simulations also predict an increased accumulation of sediment in the back-barrier basin, this accumulation is far too weak to compensate for the rise in mean sea level.

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