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

The vegetation case is set up to test the XBeach vegetation module and is based on an experiment described by \citet{Lovas2000}. The experiments were carried out in a 40 m long wave tank with an underwater slope of 1/30 (see \autoref{fig:Vegetation_lovas_case_4}, bottom panel), and several runs were carried out with and without vegetation. The flexible vegetation mimics were placed in about 0.3 - 0.5 m water depth and had an effective height of about 0.09 m. The vegetation density was 1200 units/m2. The test program included random waves with two peak wave periods and two wave heights. In addition, two experiments were carried out in which the water depth was lowered, resulting in a total of six different experiments.

\autoref{fig:Vegetation_lovas_case_4} shows the measurements and model results for both the XBeach nonhydrostatic (top panel) and surfbeat (middle panel) mode for case 4 of the experiments. The test presented considers the effect of the vegetation on the high-frequency (sea-swell) wave height (solid lines) and the low-frequency (infragravity) waves (dotted). Results for the other cases as well as the overall validation of the vegetation module of XBeach is described in more detail in \citet{Rooijen2016}. 

${tools.image('Vegetation/', 'lovas_case_4.eps', 'Significant high-frequency (sea-swell) and low-frequency (infragravity) wave height computed with XBeach nonhydrostatic (top panel) and surfbeat mode (middle panel) without (black) and with vegetation (orange) for case 4 reported by \citet{Lovas2000}. Measurements are indicated with the black and grey symbols (respectively, without and with vegetation)')}
