Current version: v.2.9

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COHERENS is a modelling system designed for a wide range of applications in coastal and shelf seas, estuaries, lakes and reservoirs. COHERENS follows a modular structure based on a numerical hydrodynamical model. It includes side-modules among which generic biological and sediment transport modules.

The development of COHERENS is led by researchers at RBINS in collaboration with worldwide scientists. COHERENS is available to the scientific community as a free and well-documented open source code.

About COHERENS » Register and download » Getting started »

Model features

COHERENS follows a modular structure and offers a wide range of physical and numerical schemes. It is written in FORTRAN 90 and can be used in parallel mode. Several file-formats, including netCDF, are available.

Full list of features » Get the full documentation »

Important keywords

numerical model, three-dimensional, shallow waters, coastal seas, shelf seas, estuaries, lakes, reservoirs, ocean, coastal applications, multi-purpose, high flexibility, modular structure, hydrodynamic, sediment transport, tracers, biology, free, open source, FORTRAN 90, parallel mode, netCDF, worldwide, large user community, comprehensive documentation

Latest news

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Join our low-volume mailing list and automatically get important announcements and information about new releases.

Test cases

Many different test cases have been implemented. They are described in detail in the COHERENS manual.

River test case
A non-rotating channel of uniform depth with open ends. Lateral effects are ignored.

See all available test cases »

The COHERENS forum

You will find answers to all your questions in the COHERENS users forum. The forum is moderated by seasoned COHERENS users.

Last forum posts

Adding the wind vector as an output by Sou
Thu Jan 21, 2016 6:39 pm

running Discharges test case by jfarhani88
Mon Nov 09, 2015 12:03 pm

Include wind by Katherine
Wed Oct 14, 2015 7:58 am

COHERENS workshop and training session in November! by valerie
Tue Oct 13, 2015 8:31 am

what is equivalent of IOPTM (coherens1) in coherens2? by Sou
Tue Aug 11, 2015 8:57 pm

Recent publications
mentioning COHERENS

Bendtsen, J., Mortensen, J., and Rysgaard, S. (2014). Seasonal surface layer dynamics and sensitivity to runoff in a high Arctic fjord (Young Sound/Tyrolerfjord, 74°N). Journal of Geophysical Research: Oceans 119, 6461–6478.

Kämpf, J., and Ellis, H. (2014). Hydrodynamics and Flushing of Coffin Bay, South Australia: A Small Tidal Inverse Estuary of Interconnected Bays. Journal of Coastal Research.

Vinh, V.D., Baetens, K., Luyten, P., Tu, T.A., and Anh, N.T.K. (2014). The influence of surface wind on the salinity distribution and circulation in the coastal waters of the Res river Delta, Vietnam. Journal of Marine Science and Technology 13, 12–20.

Wang, Q., Zhu, L., and Wang, D. (2014). A numerical model study on multi-species harmful algal blooms coupled with background ecological fields. Acta Oceanologica Sinica 33, 95–105.

More publications »