Trondheimsleia (tidal current fields in electronic navigational chart systems)
In cooperation between University of Oslo, C-MAP and the Norwegian Hydrographic Service a system for displaying tidal current in Electronic Chart Display and Information System (ECDIS) has been developed. Official Electronic Navigational Chart (ENC) in compliance with the International Hydrographic Organization (IHO) S 57 Standard has been used in the implementation.























The tidal current fields can be displayed in real time on the electronic navigational chart and several options and functions for updating and zooming have been designed. The current fields are calculated from a data base with the harmonic constants for the four major tidal constituents. The harmonic constants are obtained from a high resolution numerical model which is validated by comparing with sea level and current measurements. The depth matrix for the central part of the model domain was calculated from data from multi-beam bathymetric surveys. An application example of the implementation is given for Trondheimsleia, a part of the main sailing route along the western coast of Norway

Note: Only tidal current is calculated in this project.

The figures belows are from two selected areas; The Garten-Storfosna channel west of Ørlandet, and Agdenes at the mouth of the Trondheimsfjord. The examples are from a period with strong tidal currents in late February 2002 due to coincidence of full Moon and lunar perigee on 27 February.

The screen display of the electronic navigational chart for a section of Trondheimsleia southwest of Ørlandet at the time of the peak out-going (ebb) tidal current. 28 February 2002, 14:00 UT.

The screen display of the electronic navigational chart for a section of Trondheimsleia southwest of Ørlandet at the time of the peak in-going (flood) tidal current. 28 February 2002, 20:00 UT.

Zoom 1; Peak out-going (ebb) tidal current. 28 February 2002, 14:00 UT.

Zoom 2; Peak out-going (ebb) tidal current. 28 February 2002, 14:00 UT.

Zoom 3; Peak out-going (ebb) tidal current. 28 February 2002, 14:00 UT.

The screen display of the electronic navigational chart near Agdenes at the time of the peak out-going (ebb) tidal current. 28 February 2002, 14:00 UT.

Zoom Agdenes; 28 February 2002, 17:00 UT.

You can find a paper describing the project here: http://www.math.uio.no/eprint/appl_math/2004/03-04.html