%%===DeltaBasin H5019.50 V1==================================================================================

In experiment V1 of the Delta Basin H5019.50 pilot experiments \cite{Boers2008} the influence of structures on erosion of dunes next to is investigated. The depth scale of the experiment is n\subscript{d} = 60, the length scale is n\subscript{l} = 120. The grain size is \SI{125}{\micro\meter}. The initial cross-shore profile is an exact 1:10 reproduction of the cross-shore profile used in the 2005/2006 Delta Flume experiments. Dikes and dune revetments consisted of a concrete layer on a fill of sand. All connections in the experiment are closed and abrupt. The water level was constant at 0.45 m above the concrete floor at the waveboard. Dunes and dikes had a crest height of 0.617 m. The dune foot revetment had a crest height of 0.50 m on top of which a 11.7 cm thick sand layer was placed. The wave conditions correspond to a Jonswap spectrum with a wave height of H\subscript{m0} = 0.15 m and peak period of T\subscript{p} = 2.07 s. 

%---RESULTS--------------------------------------------------------------------------------------------------
\autoref{fig:MR_V1CompADeltaR} presents a spatial overview of the dune crest retreat $\Delta$R\superscript{*} and the erosion volume A at t = 90 min. The erosion in a dike breach is a function of the breach width and the wave period, see breach B1, B2 \& B3 in \autoref{fig:MR_V1CompADeltaR}. XBeach predicts the erosion to increase for a smaller breach width. When the wave period increases the breach erosion also increases.

\autoref{fig:MR_V1CompMeanDune} compares the mean dune crest retreat $\overline{$\Delta$R\subscript{*}}$, the mean erosion volume $\overline{A}$ and the mean bottom elevation $\overline{\textrm{z}\subscript{b}}$ of dune sections D1 \& D2. The predictive capabilities of XBeach in dune sections D1 \& D2 is very good. In experiments V1 $\overline{\textrm{z}\subscript{b,Pred}}$ above SSL shows a close resemblance with $\overline{\textrm{z}\subscript{b,WP}}$, see the lower panel of \autoref{fig:MR_V1CompMeanDune}. The predicted mean erosion volume $\overline{\textrm{A}\subscript{Pred}}$ is slightly underestimated, see the middle panel of \autoref{fig:MR_V1CompMeanDune}. This is explained by the fact that the foreshore in XBeach raised more than in the experiments. The development in time of $\overline{\textrm{A}\subscript{Pred}}$ is simulated well by XBeach. The predicted mean dune crest retreat $\overline{\Delta \textrm{R}\superscript{*}\subscript{Pred}}$ is larger than $\overline{\Delta\textrm{R}\superscript{*}\subscript{Argus}}$, see the upper panel of \autoref{fig:MR_V1CompMeanDune}. The difference with the mean dune crest retreat derived from profile measurements $\overline{\Delta \textrm{R}\superscript{*}\subscript{WP}}$ is smaller. This is caused by the definition of the retreat point R\superscript{*}. The development in time of $\overline{\Delta \textrm{R}\superscript{*}\subscript{Pred}}$ shows a close resemblance with the measured time development of $\overline{\Delta \textrm{R}\superscript{*}\subscript{Argus}}$.


%---IMAGES----------------------------------------------------------------------------------------------------
\begin{sidewaysfigure}[p]
	\centering\fbox{
	\psfragfig{721_Images/MR_XBeachComparison/EPS/V1/MR_CompADeltaR}}
	\caption[Spatial comparison of experiment V1 at t = 90 min]{Experiment V1: Spatial comparison at the end of the experiment at t = 90 min. Upper panel: Spatial overview of the dune crest retreat $\Delta$R\superscript{*} measured by the Argus system ({\color{blue}\rule[0.08cm]{0.4cm}{0.01cm}}), the profile measurements ({\color{black}$\bullet$}) and the XBeach prediction ({\color{red}\rule[0.08cm]{0.4cm}{0.01cm}}). Lower panel: Spatial overview of erosion volume A based on profile measurements ({\color{black}$\bullet$}) and the XBeach prediction ({\color{red}\rule[0.08cm]{0.4cm}{0.01cm}}).}
	\label{fig:MR_V1CompADeltaR}
\end{sidewaysfigure}

\begin{figure}[p]
	\centering
		\begin{tabular}{|m{13.9cm}|}
		\hline\vspace{1.75mm}
			\psfragfig{721_Images/MR_XBeachComparison/EPS/V1/Dune/MR_CompDeltaRMean}\vspace{-0.75mm}\\
			\psfragfig{721_Images/MR_XBeachComparison/EPS/V1/Dune/MR_CompAMean}\vspace{-0.75mm}\\
			\psfragfig{721_Images/MR_XBeachComparison/EPS/V1/Dune/MR_CompBottom}\vspace{3mm} \\
		\hline
	\end{tabular}
	\caption[Mean erosion parameters of D1 \& D2 in Experiment V1]{Mean erosion parameters of D1 \& D2 in Experiment V1. Upper panel: Mean dune crest retreat $\overline{\Delta \textrm{R}\superscript{*}}$ of 1. Argus measurements ({\color{blue}\rule[0.08cm]{0.4cm}{0.01cm}}) and its standard deviation ({\color{blue}$--$}), 2. XBeach ({\color{red}\rule[0.08cm]{0.4cm}{0.01cm}}), 3. Profile measurements ({\color{black}$\bullet$}) and its standard deviation (whiskers). Middle panel: Mean erosion volume $\overline{A}$ of 1. XBeach ({\color{red}\rule[0.08cm]{0.4cm}{0.01cm}}) and its standard deviation ({\color{red}$--$}), 2. Profile measurements ({\color{black}$\bullet$}) and its standard deviation (whiskers). Lower panel: Mean final bottom elevation $\overline{z\subscript{b}}$ of XBeach ({\color{red}\rule[0.08cm]{0.4cm}{0.01cm}}) and profile measurements ({\color{black}\rule[0.08cm]{0.4cm}{0.01cm}}), the initial bottom elevation of XBeach ({\color{red}$-\cdot-$}) and profile measurements ({\color{black}$-\cdot-$}), SSL ({\color{blue}$--$}) and minimum \& maximum measured elevation ({\color{Gray}$--$}).}
	\label{fig:MR_V1CompMeanDune}
\end{figure} 