There are three sediment processes models within the MIKE 21 software package:

• the Sand Transport Module (ST),
• the Mud Transport Module (MT), and
• the Particle Tracking Module (PT)

The ST module is the sediment transport module for the assessment of the sediment transport rates and initial rates of bed level change for non-cohesive sediment resulting from currents or combined wave-current flows. The MT module is used to describe the erosion, transport and deposition of cohesive and cohesive/granular sediment mixtures under the action of currents and waves. The PT module describes the transport and fate of dissolved and suspended substances discharged or spilled within the water column.