Dhi Mike 21

| Module | Purpose | Key Outputs | | :--- | :--- | :--- | | | Water levels, currents, and fluxes. | Water level (h), velocity (u,v), discharge. | | SW (Spectral Waves) | Wind-wave growth, propagation, and dissipation. | Significant wave height (Hs), peak period (Tp), wave direction, radiation stresses. | | MT (Mud Transport) | Cohesive sediment (silt/clay) erosion, transport, and deposition. | Suspended sediment concentration, bed level change, flocculation. | | ST (Sand Transport) | Non-cohesive sediment transport, bedload, and suspended load. | Bedload rate, suspended concentration, dune migration. | | MA (Morphological Analysis) | Long-term seabed evolution (coupling HD+SW+MT/ST). | Bathymetry change over days to decades. | | ECO Lab (Water Quality/Ecology) | Customizable water quality, eutrophication, heavy metals, and ecological processes. | DO, BOD, nutrients (N,P), algae biomass, pH. | | Particle Tracking | Advection-dispersion of neutrally buoyant particles, oil spills, or larvae. | Particle trajectories, concentration, residence time. |

: The modern version, MIKE 21 FM , utilizes an unstructured mesh (typically triangles or quadrilaterals). This allows for varied resolution, where high-detail areas like coastlines have a fine mesh while open sea areas use a coarser grid to save computational power. dhi mike 21