In order to calculate the channel dimensions environmental parameters
are determined for each point along the channel. These determinations are described below:
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Cross wind. Taken from the wind climate that the user has defined. The two angles which are 90° to
each side of the channel (i.e. crossing it) are determined, and the wind speed for these two directions are
determined from the wind rose by linear interpolation. The cross wind is taken to be the larger of the two values.
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Cross current. Taken from the currents that the user has defined. The two angles which are 90° to each
side of the channel (i.e. crossing it) are determined, and the current speed for these two directions are
determined. The cross current is taken to be the larger of the two values. The currents for both directions are
determined based on a Delaunay triangulation of the current locations which the user has defined, including the
coastline and the outline of the bathymetry. Coastline and outline points take the currents of the closest
current point which the user has input. Based on this triangulation the triangle which encloses a given point will
be determined. The cross currents will be calculated at each vertex of this triangle (using linear interpolation
of current directions) and the cross current will be determined (using bilinear interpolation in space).
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Longitudinal current. Taken from the currents that the user has defined. The two angles longitudinal to
the channel section are determined, and the current speed for these two directions are determined. The cross
current is taken to be the larger of the two values. The currents for both directions are determined based on a
Delaunay triangulation of the current locations which the user has defined, including the coastline and the
outline of the bathymetry. Coastline and outline points take the currents of the closest current point which the
user has input. Based on this triangulation the triangle which encloses a given point will be determined. The
cross currents will be calculated at each vertex of this triangle (using linear interpolation of current directions)
and the cross current will be determined (using bilinear interpolation in space).
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Wave height. Wave height points input by the user are triangulated along with the coastline and the outline
of the bathymetry. Coastline and outline points take the wave height of the closest wave height point which the
user has input. The wave height at the point in question is determined from this triangulation using bilinear
interpolation.
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Swell Height. Swell height points input by the user are triangulated along with the coastline and the outline
of the bathymetry. Coastline and outline points take the swell height of the closest wave swell point which the user
has input. The swell height at the point in question is determined from this triangulation using bilinear interpolation.
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Depth of waterway. The depth of the waterway is determined based on the dredged channel level at the given point.