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Dhi Mike 21 -

DHI Mike 21 — Overview

DHI MIKE 21 is a suite of two-dimensional (2D) hydrodynamic and environmental modeling modules used for simulating water flow, sediment transport, waves, water quality and morphodynamics in rivers, estuaries, coastal areas and lakes.

6. Pros and Cons Summary

Key capabilities

  • Hydrodynamics: Shallow-water and Navier–Stokes-based flow simulations for currents, water levels, and discharge.
  • Waves: Spectral and phase-resolving wave models for wave propagation, transformation, and wave–current interaction.
  • Sediment transport & morphology: Bed load and suspended load transport, erosion/deposition and morphological evolution.
  • Water quality & ecology: Advection–diffusion transport, biochemical modules for nutrients, DO, algae/bloom modeling.
  • Pollutant dispersion: Dye/fate modeling, tracer studies, and assessment of accidental releases.
  • Structure interaction: Flow around piers, breakwaters, sea walls and intake/outlet structures.
  • River & estuary applications: Tidal dynamics, salinity intrusion, stratification (coupled 3D options), floodplain inundation.
  • Coupling & customization: Links to MIKE 3 (3D), MIKE HYDRO, MATLAB, and user-defined modules via APIs/scripting.

C. MIKE 21 ST (Sediment Transport Module)

  • Function: Models the movement of sand and mud.
  • Strengths: Essential for studying coastal erosion, siltation of harbors, and dredging impacts. It can calculate bed level changes over time (morphology).

A. MIKE 21 HD (Hydrodynamic Module)

This is the heart of the software. It solves the depth-integrated Navier-Stokes equations. dhi mike 21

  • Strengths: It handles rapidly varying bathymetry, flooding and drying (intertidal zones), and complex boundary conditions (tides, flows, water levels). It is exceptionally stable even in harsh hydraulic conditions.
  • Use Case: Simulating currents and water levels in coastal areas or rivers.