A 3D hydrodynamic model for coastal oceans

Features are

  • ∞ vertically boundary-following coordinates with adaptive internal layer distribution
  • ∞ cartesian, spherical and curvilinear horizontal coordinates
  • ∞ nonlinear free surface with split-explicit mode-splitting and drying-and-flooding capability
  • ∞ state-of-the-art vertical turbulence closure from GOTM
  • ∞ efficient subdomain decomposition for massively parallel applications
  • ∞ optional nonhydrostatic extension
  • ∞ fully-coupled biogeochemical modelling via FABM
  • ∞ coupling interfaces to ESMF and OASIS
  • ∞ active user-forum
  • free and open-source
After moving to a new CMS, this website is still work in progress. Manuals and Howto's will be added step-by-step.

Latest publications

Spring bloom dinoflagellate cyst dynamics in three eastern sub-basins of the Baltic Sea

Sildever, S., Kremp, A., Enke, A., Buschmann, F., Maljutenko, I., Lips, I. (2017)
Continental Shelf Research 137, 46--55
Dinoflagellate cyst abundance and species composition were investigated before, during and after the spring bloom in the Gulf of Finland, north-eastern Baltic Proper and Gulf of Riga in order to detect spatial and temporal dynamics. Transport of newly formed cysts by currents was modelled to explore the possible distance travelled by cysts before sedimentation. The cyst community of the spring bloom dinoflagellates was dominated by the cysts of Biecheleria baltica in all basins, despite its marginal value in the planktonic spring bloom community in the Gulf of Riga. Dinoflagellate cyst abundance in the surface sediments displayed temporal dynamics in all basins, however, this appeared to be also influenced by physical processes. The model simulation showed that newly formed cysts are transported around 10–30 km from the point of origin before deposited. The latter suggests that transport of resting stages in the water column significantly affects spatial cyst distribution in the sediments and thus needs to be considered in the interpretation of temporal biological productivity patterns of a water body from cyst proxies. (read more)

Internal variability of a 3-D ocean model

A numerical model for the entire Wadden Sea: Skill assessment and analysis of hydrodynamics

Gräwe, U., Flöser, G., Gerkema, T., Duran‐Matute, M., Badewien, T. H., Schulz, E., Burchard, H. (2016)
Journal of Geophysical Research: Oceans 121, 5231--5251
A baroclinic three-dimensional numerical model for the entire Wadden Sea of the German Bight in the southern North Sea is first assessed by comparison to field data for surface elevation, current velocity, temperature, and salinity at selected stations and then used to calculate fluxes of volume and salt inside the Wadden Sea and the exchange between the Wadden Sea and the adjacent North Sea through the major tidal inlets. The model is simulating the reference years 2009–2011. An overview of tidal prisms and residual volume fluxes of the main inlets and their variability is given. In addition, data from an intensive observational campaign in a tidal channel south of the island of Spiekeroog as well as satellite images and observations of sea surface properties from a ship of opportunity are used for the skill assessment. Finally, the intensity of estuarine overturning circulation and its variability in the tidal gullies are quantified and analyzed as function of gravitational and wind straining using various estimates including Total Exchange Flow (TEF). Regional differences between the gullies are assessed and drivers of the estuarine circulation are identified. For some inlets, the longitudinal buoyancy gradient dominates the exchange flow, for some others wind straining is more important. Also the intensity of tidal straining (scaled covariance of eddy viscosity and vertical shear) depends on buoyancy gradient and wind forcing in different ways, depending on local topography, orientation toward the main wind direction, and influence by freshwater run off inside or outside the tidal basin. (read more)