MIKE by DHI UK and Ireland Blog

Previews of MIKE by DHI Release 2012

We are gradually approaching the release of the MIKE by DHI software package 2012, which is scheduled for this October. As in previous issues of our newsletter, we would like to disclose a preview of the many new and exciting features, which we hope will improve your experience when using the software products, both with regard to usability, productivity, and enhanced applications.

MIKE FLOOD AD: fully dynamic AD-coupling

Release 2012 introduces a fully dynamic AD-coupling in MIKE FLOOD, which increases the range of applications substantially.

For more than a decade, MIKE FLOOD has offered complex and flexible features for coupling 1D and 2D hydrodynamic models. Flood extents and flood hazards have been some of the key issues for flood modelling. These issues will continue to be of great importance and still be focus points for many modelling applications in the future, but in addition to this, the new release of MIKE FLOOD now offers the option to simulate the transport and spreading of pollutants during a flood event through a fully dynamic coupling of the Advection Dispersion modules of MIKE 11, MIKE 21, and MIKE URBAN.

The new AD-coupling in MIKE FLOOD enables users to simulate new interesting aspects such as: -

• floodplain contamination from polluted rivers
• impact assessment on river quality from pollutant sources in flood prone areas during flood events
• the impact on concentrations of river pollutant in case of a release from an urban Combined Sewer Overflow

MIKE 21 FM: New dike structure option

A new dike structure option has been implemented in the Flexible Mesh series of MIKE 21 and MIKE 3. Dike structures are defined by structure specific data parameters as well as location and geometry. The location in the horizontal domain is given by two or more geo-reference points (a polyline), which defines the width of the structure perpendicular to the flow direction. Each point in the polyline should be given a crest level, and it is therefore possible to obtain a spatial variation of crest elevations along a dike structure within the model domain.

Dike structures are generally used to describe local flow obstructions or other special topographical features, which are not included in the model bathymetry, and as such a highly useful feature for both coastal and inland applications. The discharge over a section covered by the dike is calculated using a standard weir expression.

MIKE SHE: Frozen soil

The 2012 release of MIKE SHE will contain a range of new improvements. Among these are the improvements in simulation of the annual variation of soil infiltration capacity due to freezing and thawing dynamics.

A simplified approach has been implemented, which allows the user to define a time-varying OL-UZ (Overland to Unsaturated Zone) leakage coefficient, and thereby enables the user to control the balance between infiltration and direct runoff from precipitation during all seasons of the year.
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