Innovation in MIKE FLOOD

New Rapid Solution Solver Technique - 2D overland flow modelling using fine scale DEM with manageable runtimes



The use of modern surveying methodologies such as LIDAR, produce high resolution spatial data which are applied in fine scale Digital Elevation Models (DEM). The horizontal resolution (grid cell size) in many cases is of the order of 1m and a vertical accuracy a few centimeters. Such fine scale data sets are ideal for developing 2D overland flow models; however modelling at such fine scale is often not practically manageable due to the long model runtimes. In practical cases, choosing the model cell size of a 2D flood model often becomes a compromise between accuracy and model runtimes. Consequently the available topographical data is not being fully utilised.



To overcome this limitiation DHI have developed an innovative solution technique that enables rapid solution whilst utilising all the available topographical data. This article describes the solution of the continuity and momentum equations as well as MIKE FLOOD application examples showing pros and cons of using the new method. Amongst the pros are the reduction in model runtime by a factor of 5 to 10 times.

The paper includes:

1. Methodology
2. Technical background
3. Application cases
4. Conclusion

> Full paper [PDF]

Flood Risk Management: Research and Practice - Samuels et al. (eds)
© 2009 Taylor & Francis Group, London, ISBN 978-0-415-48507-4