Using MIKE 21C to test solutions before implementation
Testing remedial actions in the MIKE 21C morphological model is cheap compared to the implementation cost. Solutions could involve capping of the riverbed, construction of sills along the river to induce sedimentation of clean sediment coming from the upstream catchments, hydraulic and source control.
The hydro-morphological problem is extremely complex with eddies forming over large scour holes, small tie channels flowing to and from lakes, and floodplain flow. The problem also has large time and spatial scale variations, requiring an efficient numerical model.
The sedimentation is modelled as a graded problem with 14 sediment fractions consisting of four cohesive and three sand fractions mirrored by contaminated counterparts, with the bed substrate described by five layers. The hydro-morphological models are required to run several years when testing solutions.