<%namespace name="tools" file="tools.tex"/>
<%! import os %>


\textbf{Experiment description}\newline
Vedersoe is located at the Danish North Sea coast. Coastal measurements along multiple transects were obtained before and after a severe storm in January 2005, and reported to the Danish Coastal Authority. The observed dune retreats and erosion volumes show a high variability in alongshore direction. A study by the Danish Coastal Authority (DCA), as a part of the larger EU-InterReg project Building with Nature, considered two 1D transects close to each other (< 500 m) for which the observed dune retreat ranges from 4 to 14 meter, see \autoref{fig:overview_vedersoe} \citep{Kystdirektoratet2021}. Though the profiles show large similarity, the different erosive behavior is likely due to the presence of a berm (above storm surge level) which reduces the erosion for one of the profiles. The two transects at Vedersoe are used to validate the BOI-XBeach model and settings for morphological changes due to storm impact. Compared to the Dutch coast, the Danish profiles have a similar slope in the lower shoreface, but a steeper surfzone. 

According to \citet{saye2006} the Danish Southwest coast has a strong alongshore variation in grain size, with grain sizes up to 0.4 mm. However, \citet{clemmensen2006} show that dunes in the southwest of Denmark are mainly formed by aeolian transport of fine-grained sand with a D50 of around 0.2 mm. They also note that the ‘inland’ dunes are more coarse-grained than the coastal dunes. A D$_{50}$ of 0.25 mm is used within the BOI project.

${tools.image(os.path.join(data_path,'Vedersoe'), 'overview_vedersoe.png', 'Location of the study area near Vedersoe (Denmark). The two different transects considered in this study are located close to each other, but different morphological behaviour is observed. Source: \citet{Kystdirektoratet2021} ' ,label='overview_vedersoe')}

The wave climate during the storm in 2005 is measured by wave buoys located outside Nymindegab (~50 km southward of Vedersoe at 17.5 m depth). At the deep-water wave buoy, the peak wave period Tp increased from 9.0 to 13.3 s, and Hs rapidly increased from 2.9 to 6.6 m. Water levels during the storm are obtained at a tidal gauge on one of the headlands of Ferring (~30 km to the North from Vedersoe), and reached up to 3 m +MSL during the 2005 storm.  

\textbf{Results}\newline		
Although the two transects are located within ~500 m of each other and were exposed to the same hydrodynamic forcing, their morphological response differs significantly. The results for Vedersoe 01 are presented in \autoref{fig:Vedersoe_v_01} and the results for Vedersoe 02 are presented in \autoref{fig:Vedersoe_v_02}. In addition, he dune erosion volumes and retreat distances at 5m + MSL, based on the measured pre- and post-storm profiles and the XBeach simulations are tabulated for both profiles in \autoref{tab:Vedersoe}.

${tools.image('Vedersoe/v_01', 'BL_BeforeAndAfterStorm_Profile_v_01.eps', 'XBeach results for cross-shore transect Vedersoe 01 Initial bed levels are depicted by the black dashed line, observed post-storm bed levels by the black solid line and XBeach model results are presented in red. The modelled dune erosion is shown by the red shaded area, whereas the observed dune erosion is depicted with the grey shaded area.',label='Vedersoe_v_01', width=145)}

${tools.image('Vedersoe/v_02', 'BL_BeforeAndAfterStorm_Profile_v_02.eps', 'XBeach results for cross-shore transect Vedersoe 02. Initial bed levels are depicted by the black dashed line, observed post-storm bed levels by the black solid line and XBeach model results are presented in red. The modelled dune erosion is shown by the red shaded area, whereas the observed dune erosion is depicted with the grey shaded area.',label='Vedersoe_v_02', width=145)}

${tools.table('Vedersoe/', 'skill.tex', 'A quantitative comparison of modelled and observed erosion volumes [$m^3/m$] and dune retreat [m] at 5m + MSL for both profiles', 'Vedersoe')} 