MIKE 21 HD is the basic computational hydrodynamic module of the entire MIKE 21 system providing the hydrodynamic basis for other MIKE 21 modules such as advection-dispersion (AD), water quality (ECOLab), sand transport (ST) and mud transport (MT).
MIKE 21 HD simulates the water level variation and flow in response to a variety of forcing functions in lakes, estuaries, bays and coastal areas. The water levels and flows are resolved on either a rectilinear grid, a curvilinear grid, a triangular element mesh or any combination hereof covering the area of interest.
MIKE 21 HD includes formulations for the effects of:
- convective and cross momentum
- bottom shear stress
- wind shear stress at the surface
- barometric pressure gradients
- Coriolis forces
- momentum dispersion (through e.g. the Smagorinsky formulation)
- wave-induced currents
- sources and sinks (mass and momentum)
- evaporation and precipitation
- flooding and drying
- hydraulic structures
Hydrographic boundary conditions can be specified as a constant or variable (in time and space) level or flux at each open model boundary, as a constant or variable source or sink anywhere within the model, and as an initial free surface level map applied over the entire model.
MIKE 21 HD can be applied to a wide range of hydraulic and related phenomena. This includes modelling of tidal hydraulics, wind and wave generated currents, storm surges and flood waves. It is a general hydraulic model that easily can be set up to describe specific hydraulic phenomena. Examples of such applications are:
- tidal exchange and currents
- storm surge
- secondary circulations, eddies and vorticies
- harbour seiching
- dam-break