The model bathymetry is presented in Figure 10. For this large model domain several different bathymetry datasets were used and pasted together from different sources and in different coordinate systems. All coordinate conversions were done with the Open earth Toolbox in Matlab.
The coordinate systems of all data were converted to RD Paris. In this paragraph, an overview of the different datasets to build this large model domain is given.
Figure 10 - Model bathymetry (m TAW)
5.3.1. Coastal zone and mouth of the Western Scheldt
Greater North sea bathymetry is available from EMODnet.eu database. The year of measurement is unknown. Original data were in WGS84 and LAT (blue colour in Figure 11).
The bathymetry of the Belgian continental shelf and coast comes from MDK coastal department. The
data for the beaches are measured in 2010. The coastal zone (shoreface) is measured in 2009. The
offshore part is measured in 2007. The original data were in WGS84 UTM31N and m TAW (orange
colour in Figure 11).
The measurements for the Dutch coast were downloaded from the Open Earth database. The original data are in RD Parijs and m NAP (green colour in Figure 11). It was measured from 2007 to 2012 (different parts in different years).
For the port of Zeebrugge the bathymetry was measured in 2014. The original data was given in ETRS89 UTM31 and m TAW. The data was copied from the aMT GIS database (\\wm162458\Data\GISdata\frame\bth\frame_bth_kub_etrs89utm31n.gdb).
For the port of Nieuwpoort a bathymetry from VHO from 2014-2015 was used. The original data were in ETRS89 UTM31 and LAT. LAT conversion to TAW was done by adding 0,65 m to all datapoints.
For the port of Oostende a bathymetry of VHO from 2014 was used. The original data were given in ETRS89 UTM31 and LAT. LAT conversion to TAW was done by adding 0,50 m to all datapoints.
For the port of Blankenberge a bathymetry of VHO from 2015 was used. The data were originally in ETRS89 UTM31 and LAT. LAT conversion to TAW was done by adding 0,32 m to all datapoints.
Figure 11 - Overview of the bathymetric data for the coastal zone : blue colour – greater North sea bathymetry ; orange colour – Belgian continental shelf and coastal zone ; green colour – measurements for the
Dutch coast
5.3.2. Eastern Scheldt and Western Scheldt
The bathymetry of the Western Scheldt was delivered by RWS. We started from data from 2013 in ETRS89 UTM31 and LAT. The data was collected from aMT GIS database. Conversion to TAW was done by a conversion grid LAT-to-TAW.
The bathymetry of the Eastern Scheldt was measured in 2010 and is delivered by RWS. This dataset
was in RD Parijs and m NAP.
5.3.3. Lower Sea Scheldt
The topographic data for the channel banks are taken from the Mercator databank as a Digital Height Model (DHM) with a resolution of 5x5 m (Lambert 72). The data originates from 2007.
A topo-bathymetric data set from Maritime Access is used for the Lower Sea Scheldt. These data originate from 2011, and were in RD Paris and m TAW (purple colour in Figure 12).
Figure 12 - Bathymetry lower Sea Scheldt. Beneden Zeeschelde. The purple coloured zone is part of a topo-bathymetric dataset from 2011. The grey area is the back is part of the DHM Vlaanderen dataset from 2007.
5.3.4. Upper Sea Scheldt
The Upper Sea Scheldt region topo-bathymetry consists of several datasets put together. The most recent data are always on top of older data.
For the Upper Sea Scheldt a topo-bathymetry from 2011 is used (RD Parijs, m TAW). (=blue colour in Figure 13). Maritime Access Division (MT) delivered the data.
The data from the Mercator database (DHM with a resolution of 5x5 m, Lambert 72) is used to fill up the missing topography/bathymetry of the upper part of Durme. (= black colour in Figure 13) This part of the Durme is not continuously filled with water. Therefore the topography will suffise.
A topo-bathymetry from 2013-2014 is used in the Upper Sea Scheldt and Rupel (resolution 1x1 m, Lambert 72, m TAW). (= Orange colour in Figure 13). The data was delivered by Maritime Access.
For the Durme between Waasmunster and Lokeren a bathymetry from 2012 was available (from
W&Z in Lambert 72 and m TAW with 1x1 m resolution ; red colour in Figure 13). For the Durme from
mouth to Waasmunster a bathymetry of 2013 was available (from W&Z in Lambert 72 and m TAW
with a 1x1 m resolution; green colour in Figure 13).
For the tidal branch from Merelbeke to Zwijnaarde, measured cross sections were available from MT.
The original data was given in WGS84UTM31 and m TAW and dates from 2003.
(not shown in Figure 13).
Additional datasets for the flood control areas were available for Bergenmeersen, Paardeweide, Uiterdijk, Potpolder I, Potpolder IV, Tielrodebroek, Klein Broek, Groot Broek, Lippenbroek, Bovenzanden, Polder van Lier, Grote Wal and Scheldebroek. Topography data was from 2013 provided by W&Z. The data were originally given in Lambert 72 and m TAW with a 1x1 m resolution.
(= yellow areas in Figure 13).
Figure 13 - Datasets of bathymetry/topography of Upper Sea Scheldt: black color = DHM Vlaanderen for most upper part of the Durme. Blue color = topobathymetry from 2011. Orange color = topobathymetry from 2014.
Red color = bathymetry for Durme from 2012. Green color = bathymetry for Durme from 2013. Yellow areas = topography of flood control areas from 2013.
5.3.5. Rupel basin
The topo-bathymetry for the Rupel is taken from the dataset Sea Scheldt Topo-bathymetry 2013 – 2014 (m TAW, RD Parijs) from Maritime Access (= blue colour in Figure 14).
A part of the topographic data set from 2007 (from Maritime Access Division, m TAW, RD Parijs) was used for the tributaries of the Rupel (orange colour in Figure 14). For the Zenne, cross sections from 2001 were also used (from IMDC, RD Parijs, mTAW ; red colour in Figure 14). For the Dijle (grey colour in Figure 14) and Nete (green colour in Figure 14) the bathymetry from 2010 – 2013 (from W&Z, RD Parijs, m TAW) and cross sections from 2001 (from IMDC) were used.
The bathymetry of the flood areas was defined based on the topographic data. The areas outside this
topographic data were filled with the data from the Mercator database, DHM Flanders.
Figure 14 - Rupel basin: blue = topo-bathymetry from 2013-2014 from MT; orange = topography from total Sea Scheldt basin from 2007, given by MT; red = bathymetry Zenne = cross sections from 2001. Data from IMDC;
black = bathymetry from 2010-2013 coming from W&Z; grey = cross sections from 2001 coming from IMDC;
yellow = bathymetry coming from W&Z dating from 2010-2013; green = cross sections from 2001 from IMDC data.