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Metocean Desk Study: Bathymetry EMODnet data (June 24, 2019)

    Dia de Wijs
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    Asked by Dia de Wijs 581 days ago Answers (1)

    For the model bathymetry EMODnet data has been used by DHI. The EMODnet data from 2016 has a resolution of 1/8 * 1/8 arc minutes, which is about 140m x 230m. The Metocean Database report indicates however in table 3.1 that the resolution of the EMODnet data is 0.125 minutes (1400m x 2300m). Figure 3.4 on the top left (see report) shows the used EMODnet data which appears to have a resolution of more than 500m. Has the EMODnet data been modified / made coarser by DHI, and if so why?

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      • Dia de Wijs
        • Public

        Dia de Wijs 581 days ago

        Figure 3.4 (top) shows the scatter data from Fugro covering HKN combined with EMODnet after interpolation on the mesh (see text above Table 3.1).

        The mesh resolution at HKN is 400m and it gradually increases in size to ~600m at HKW, IJmuiden-Ver etc. At HKN, the Fugro bathymetry interpolated to a 50 m grid was used. So Fugro’s high resolution bathymetry was used where we have 400m resolution.

        The EMODnet data used for this study has a resolution of around 140m x 230m for HKN area (1/8 * 1/8 minutes); as the grid size is significant larger in this area (400m or larger), using the finer bathymetry data available via EMODnet (resolution of 1/16 x 1/16 minutes, grid size of around 70m x 115m) would not have a significant effect on the model results. 

        NB: Please be aware that the 1400m x 2300m in Table 3.1 is not correct and should be 140m x 230m.

        Correct Table 3.1 is shown below:

         Table 3.1 Bathymetry data sources applied