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1 Flood Modelling Summary of MIKE11/MIKE21/MIKE Flood Advantages and Suitability.

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Presentation on theme: "1 Flood Modelling Summary of MIKE11/MIKE21/MIKE Flood Advantages and Suitability."— Presentation transcript:

1 1 Flood Modelling Summary of MIKE11/MIKE21/MIKE Flood Advantages and Suitability

2 2 Flood Modelling Advantages of 1D model (MIKE11) : Accurate hydraulic description in rivers/channels which behave pre- dominantly one-dimensional Less computational points than 2D model, ie. less CPU time Easy to overview and comprehend results Automatic access to sub-modules such as the advanced Structure Operation module and Flood Forecasting module Disadvantages of 1D model (MIKE11) : Flow paths must be known on beforehand in cases where floodplain branches and and link-channels are established Generally more effort needed in model schematization than a 2D model No detailed results (eg. velocity field) on flood plains

3 3 Flood Modelling MIKE 11 suitable for projects : Where flood duration, flood extent and storage volume are the important issues on the plains Where detailed flow pattern, depths and velocity on the plains are not important With many different and complicated structures Where other problems (water quality, sedimentation, Flood Forecasting) are to be addressed with the same model tool

4 4 Flood Modelling Advantages of 2D model (MIKE21) : 2-D flow simulated dynamically without pre-scribing flow patterns Relatively easy to schematise model Detailed information on velocity, depths etc. on flood plains Good for simulating embankment overtopping over long reaches Disadvantages of 2D model (MIKE21) : Costly in computational time Requires fine grid nesting in river branches in order to match MIKE 11 capability (= increased computation time) At present some shortcomings on the computation of wave front celerity Only simple fixed structures can be simulated

5 5 Flood Modelling MIKE 21 suitable for projects : Where detailed velocity and depth pattern are important Where the flow paths are not well defined but of interest With significant two-dimensional flows and where a one-dimensional model can not address the problem Which deal with local problems

6 6 Flood Modelling Advantages of MIKE Flood (MIKE11 + MIKE21) : Contains basically the benefits from both MIKE11 and MIKE21 Can be used to exchange information between a larger overall 1D model and a detailed local 2D model (at locations where no hydraulic data exist) New detailed 2D areas can easily be introduced and existing ones can be omitted Disadvantages of MIKE Flood : Two models must be maintained instead of one (but total work is app. the same)

7 7 Flood Modelling MIKE Flood suitable for projects : Where a 2D (MIKE21) description is needed in local areas and where the features of MIKE11 (eg. Advanced Structures, Flood Forecasting) are required elsewhere in the system

8 8 Flood Modelling MIKE 11 MIKE 21 MIKE Flood Problem complexity Model

9 9 Flood Modelling MIKE 11 MIKE 21 MIKE Flood Tidal effects Flood extent Flood duration Flood depth Flow exchange Flood mapping in GIS Simple structures Advanced structures Detailed velocity field Flood forecasting Unknown flow paths Split flow scenarios River flows X X 2D Flood mapping X X X X X Features Model hydraulic structure results

10 10 1D model ? 2D model ? 1D+2D model ?

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