Details
- TitelSWAN hindcasts Wadden Sea, December 2013 : tidal inlet of Ameland and eastern Wadden Sea
- Auteur
- Opdrachtgever
- Projectnummer1209433
- Plaats van uitgaveDelft
- Uitgever
- Jaar van uitgave2014 (Oct.)
- Pagina's45, [142] p.
- Illustratiesfig.
- Materiaal
- Onderwerp
- Geografisch trefwoord
- Beschrijving
Stationary SWAN simulations were executed for the tidal inlet of Ameland and the eastern Wadden Sea, during the Sinterklaas storm of 5/6 December 2013. For each of the two areas, eight moments in time were selected to simulate the waves, focussing on variation in water level and current situations, stationarity and wave penetration (presence of low frequency energy (0.03 - 0.2 Hz)). Spatial fields of wind (HARMONIE), water levels (Delft3D) and currents (Delft3D) are among the input, besides spectral boundary conditions, taken from the directional wave observations at Borkum Noord, AZB11 and AZB12. The basic runs are the A series with WTI settings (wind input and whitecapping according to Westhuysen). Four series of sensitivity runs were done, viz series B with deactivated currents, series C and D with Kamen wind input and whitecapping with delta=1 respectively delta=O. The final series (E) are like A but without enhanced whitecapping dissipation due to negative current gradients. Overall, the runs with Westhuysen input (series A, B and E) score best. At the tidal inlet of Ameland, SWAN performs well, with on average 2% underestimation in significant wave height and 5% in wave period Tm-1,O. The scatter index (random error) is respectively 20% and 10%. In the eastern Wadden Sea the bias for significant wave height is +10% (overestimation), and for wave period -5%. The scatter index is respectively 15% and 10%. These numbers hold for WTI-settings (A-series), which scores best. This study confirms that these WTI-settings - which were used for the 2011 production runs to provide hydraulic boundary conditions at the Wadden Sea - were the best available.