Report No FR0341

Dec 1992

I BENEFITS

The supplementary testing of MIKE 11 (Version 3.0) will give users greater confidence in the new version and its improved capabilities.

II OBJECTIVE

To retest the upgraded MIKE 11 (Version 3.0) program against the original UPM requirement specification.

III REASON

The original testing programme (FR 0242) reported on Version 2. 1 of the program. Since then Version 3.0 of MIKE 11 has been released. Significant alterations have been made to the way in which BOD and sediments are represented, in order to model their interactions more realistically. Therefore, a limited retesting programme has been conducted to ensure that this version fully complies with the UPM specification.

IV CONCLUSIONS

MIKE 11 Version 3.0 generally works as required, and the aspects relating to the UPM specification are working as specified.

However, care should be taken when using the MOSQITO interface for the input of polluting flows. Currently, it is recommended that wherever possible, polluting inputs should be introduced as lateral inflows within MIKE 11 , until an updated MOSQITO interface is available. This is now available in a subsequent version 3.01.

Additionally, using the new version of MIKE 11 for complex simulations involving sediment / pollutant modelling can result in excessively long 'run times' (approximately half real time).

Within these constraints, the model produces accurate results for a wide range of modelling scenarios.

V RECOMMENDATIONS

MIKE 11 Version 3.0, or subsequent minor upgrades, should become the UPM standard river impact model. Any previous versions of the software should be upgraded to Version 3.0 as soon as possible.

A conversion program is required to enable the TSF and MIF datafiles produced by previous versions of MIKE 11 to be compatible with Version 3.0.

More detailed guidance and documentation should be made available to support the modelling of BOD and sediments, and the other UPM aspects of the model.

Copies of the report are available from FWR, price £15.00, less 20% to FWR Members.