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ICE Flooding 2013 - MIKE by DHI Delegate Pack


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Delegate pack inserts for the ICE Flooding Conference 2013 - Developing Flood Resilient Communities (23 May 2013 - London, UK).

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ICE Flooding 2013 - MIKE by DHI Delegate Pack

  1. 1. ©DHITraditional approaches to flood risk management in the UK have focussed primarilyon the physics of flood water inundation from rainfall, rivers and the sea. Anunderstanding of the processes involved is critical in defining the level of flood riskand in establishing an appropriate level of defence. However, communities aresubjected to a range of additional impacts, over and above the quantity and speedof flood waters, including for example the extent and persistence of flood waterscontaminated by foul sewerage and fine sediments.We believe that accurate modelling of flooding risk and its wider impacts is essentialto deliver flood resilient communities. DHI was a pioneer in the development of trulyintegrated water modelling software. Today, our software is unrivalled in respect offlexibility, accuracy and performance; allowing the widest range of flooding andenvironmental impacts to be considered.The MIKE by DHI product family encapsulates more knowledge and covers a widerrange of water modelling needs than any similar products. Our software tools areused by professionals in 140 countries across all continents, and are available inmany sizes, flavours and languages - and most recently also in the cloud. Gettingaccess to our global knowledge has never been easier! MIKE by DHI representsmore than 50 years of research and practical experience - right at your fingertips -making you the expert in water environments.MIKE FLOODMIKE FLOOD is the most complete toolbox for flood modelling available. It includesa wide selection of 1D and 2D flood simulation engines, enabling you to modelvirtually any flood problem. Whether it involves rivers, floodplains, floods in streets,drainage networks, coastal areas, dam, levee and dike breaches or anycombination of these. Where other tools give up, MIKE FLOOD gives results!MIKE FLOOD is applicable at any scale from a single parking lot to regionalmodels. Independent studies show that you can save months of efforts and createmore reliable models by upgrading from standard 1D modelling to MIKE FLOOD!Typical MIKE FLOOD applications include: - Rapid flood assessments Flood hazard mapping Flood risk analysis for industrial, residential or cultural heritage areas Flood contingency planning, for example planning of evacuation routes andpriorities Impact assessments of climate change issues Flood defence failure studies Integrated urban drainage, river and coastal flood modellingOVERVIEWRELEVANT SOFTWAREBENEFITSState-of-the-art technology under continuousdevelopment.Professional documentation, training, supportand maintenance.A range of different licenses to suit everyneed.MIKE by DHI software truly models allsources of flooding:MIKE BY DHI DELEGATE PACK - ICE FLOODING 2013 PHOTO: ISTOCK © ON-AIRENABLING RESILIENT COMMUNITIESApplication of MIKE by DHI Software to develop integrated solutions to floodingand its wider impactsMIKE FLOODUrban, riverine and coastalflood modelling and mappingMIKE URBANModelling and GIS for waterin urban environmentsMIKE 11River modellingMIKE 212D modelling of coastal andinland watersMIKE SHEIntegrated catchment model-ling and groundwaterFEFLOWAdvanced groundwatermodellingMIKE 21CRiver hydraulics and mor-phologyFlood ToolboxArcGIS based disaster riskmanagementREAL TIMERiver operations, floodforecasting and early warning Fluvial CoastalIncl. wave overtopping Estuarine Tsunami Groundwater Surface water Sewer Canal Reservoir / dambreach Mining Flood defencefailureFor a free evaluation of our software pleasecontact us on the details below.
  2. 2. ©DHI2MIKE FLOOD features: -1D Engines 1D river network - based on DHI’s classic hydrodynamicengine for rivers and open channels. 1D sewer network – based on DHI’s equally classic enginefor sewer and drainage networks.2D Engines Single Grid - the classic rectilinear model. Easy to set upand easy input/output exchange. Now with parallelprocessing. Multi-Cell Overland Flow Solver utilising higher resolutionDEM information on a coarser simulation grid. Thesimulation speed is much faster, compared to standardsimulation with a fine resolution DEM. Flexible Mesh (FM) - maximum flexibility for tailoring gridresolution within the model. The FM engine supportsparallel processing.StructuresA range of culverts and weirs can be handled both in the 1Dand the 2D engines. In addition, operational structures can beincluded in the 1D networks using add-on modules.Fully dynamic, fully Integrated flood modellingThe 1D and 2D engines can be coupled to provide fullflexibility and the capability of investigating complex problems.MIKE FLOOD features a fully dynamic and integratedmodelling approach for coupling of Riverine, Urban and 2DOverland models depending on your project requirements.URBAN FLOODINGTodays demand for accuracy often calls for using a 1D pipeflow model combined with a 2D overland flow model. MIKEFLOOD offers such a model combination through the couplingof MIKE URBAN CS (Catchment Systems) and MIKE 21.MIKE FLOOD efficiently simulates any cause of urbanflooding, including heavy local rainfall, insufficient flowcapacity of storm water inlets or the drainage network, andflooding caused by overtopping of nearby river or coastal flooddefences.Urban flooding in MIKE FLOOD is simulated through modelcouplings at the location of nodes, pumps, weirs or outlets.Water is exchanged between the pipe flow model and theoverland flow model through these couplings in a dynamic two-way process.Defining the couplings between pipe and overland flow modelas well as launching simulations and visualising results aresupported in the GUI of both MIKE FLOOD and MIKEURBAN.RIVERINE FLOODINGMIKE FLOOD is an efficient and flexible tool for river floodmodelling when investigating flood hazards and flood risk fromrising water levels in the river/canal system and/or from highrainfall intensity in the catchment area.Flooding can be investigated on multiple scales ranging fromlarge scale basin areas to local impacts in specific low lyingflood prone areas along the river.When simulating river flooding, the combination of a 1D openchannel model using MIKE 11 and a 2D overland flow modelusing MIKE 21 is typically preferred.The flexibility of the combined 1D-2D engines providesnumerous opportunities for analysing complex issues such as: river conveyance problems due to improper maintenanceof the vegetation limited flood storage capacity infrastructures crossing the river/floodplain operation of hydraulic structures and reservoirs dam breaks or levee breaches changes in land useMIKE 11 and MIKE 21 can be coupled either at specific pointsor distributed along entire river stretches on either side of themain river channel.COASTAL FLOODINGMIKE FLOOD is ideal for efficient and accurate assessment ofcoastal flood risks, whether they are related to flooding ofcoastal cities and infrastructures, or to inundation ofreclaimed or low lying areas.The flexibility of MIKE FLOOD components enablesprofessional modelling of complex and dynamic events due toocean storm surges, and the impacts in estuaries, riversand drainage canals as well as sewer systems.MIKE FLOOD offers the possibility to investigate the effects ofcoastal protection, such as dikes/polders and tidal gates orother operational structures in delta areas.Combined with one of the MIKE wave models (MIKE 21Spectral Wave or MIKE 21 Boussinesq Wave). MIKE FLOODcan address all aspects of coastal impacts of storm surge andinundation (see page 3).MIKE BY DHI DELEGATE PACK - ICE FLOODING 2013DYNAMIC FLOOD HAZARD MAPPINGDepending upon the approach adopted(e.g. the ‘Flood Risks to People’ guidancefrom Defra / EA) MIKE FLOOD can utilisethe floodwater depths, velocities, andland use data to seamlessly calculateboth the debris factor and appropriateflood hazard rating in each grid cell /element and at each time step in asimulation.USE OF MIKE FLOOD FOR BREACH ASSESSMENTSMIKE FLOOD includes numerous options for the rapid, dynamicassessment of breach failures in river and coastal flood defences,canal embankments and dams (Reservoir Inundation Mapping): - Coupled MIKE 11 Dambreak structures MIKE FLOOD side structures links MIKE FLOOD time varying lateral links MIKE 21 time varying bathymetry - Landslide option MIKE 21 FM time varying bathymetry - Dynamic bathymetry MIKE 21 FM Dike structures
  3. 3. ©DHI3EXTENDING THE CAPABILITIES OF MIKE FLOODFor more than a decade, MIKE FLOOD has offered complexand flexible features for coupling 1D and 2D hydrodynamicmodels. Flood extents and flood hazards have been some ofthe key issues for flood risk management. These issues willstill be the focus for many modelling applications in the futurehowever, in order to support wider EU Water FrameworkDirective objectives, there will be a need for more detailedstudies; particularly water quality assessments.MIKE FLOOD now offers the option to simulate the transportand spreading of pollutants during a flood event through a fullydynamic coupling of the Advection Dispersion modules ofMIKE 11, MIKE 21, and MIKE URBAN.In addition to water quality, increased focus on wholecatchment approaches including transitional waters willrequire consideration of the interaction at the coast. As such,MIKE FLOOD is being used to undertake detailed flood impactassessments where overtopping is a particular concern.MIKE BY DHI DELEGATE PACK - ICE FLOODING 2013EXAMPLE PROCEDURE FOR CALCULATING FLOODINGDUE TO OVERTOPPING OF DEFENCES BY WAVE ACTIONThe standard approach to calculating waveovertopping volumes is through the use ofEurOtop, the European Overtopping Manual,which offers a number of methods to calculatewave overtopping at a range of differentcoastal structures. Common to each method isthe requirement for wave climate at the toe ofthe structure, and it is this that is the mostsignificant challenge in the correct usage ofEurOtop.The following example methodology is presented for inspirationonly.STEP-BY-STEP METHOD1. Assess Offshore wave conditionsWave conditions from the Met Office wave model aregenerally considered to be ‘offshore’ as they tend to be inrelatively deep water. These can be applied as boundaryconditions to an offshore wave transformation model.2. Offshore wave transformation modellingThe MIKE 21 Spectral Wave (SW) model simulates wavegrowth due to wind action, transformation due to refractionand shoaling resulting from depth variations, and decay dueto whitecapping, bottom friction and wave breaking. Theeffects of wave-current interaction, non-linear wave-waveinteraction, diffraction and areas which dry out are alsoincluded.MIKE 21 SW is applied on a flexible mesh so offshore areascan be defined with a relatively coarse resolution whileinshore areas are resolved on a finer mesh therebyoptimising runtimes and accuracy.3. Assess Nearshore wave conditionsFor an exposed simple coastline, it is tempting to use theoutput from MIKE 21 SW directly in EurOtop. However,unless the defence structure has been included in the modelat a high resolution, wave heights extracted from the modeloutput at the coastline are unlikely to accurately represent thewave climate at the toe of the structure. Similarly, for morecomplex coastlines where reflection is an important process,or for wave action within harbours, outputs from SW aloneare unlikely to be suitable for use in EurOtop.Nearshore wave conditions (generally just offshore of thebreaker zone) can be extracted from the MIKE 21 SWoutputs and used as boundary conditions for a MIKE 21Boussinesq Wave (BW) model which is a phase-resolvingmodel that solves the shallow water equations for waves innearshore areas using the Boussinesq approximation.4. Nearshore wave transformationMIKE 21 BW can be used in either 1D or 2D forms. If thecoastline where the defence structures are located isrelatively straight and of uniform cross section, a 1Dapproach can be used to transform the nearshore wavesalong a profile normal to the defence structure. By includingthe defence structure geometry in the BW model bathymetry,the wave climate at the toe of the structure can be directlyextracted from the 1D BW model results.For more complex coastlines or harbour sites, a 2D approachmay be required. Again, inclusion of the defence structures inthe model bathymetry will ensure that the wave climate at thetoe of the structure can be extracted directly from the modelresults, at any site along the defences where overtoppingcalculations are required.5. Overtopping calculationHaving determined the wave climate at the toe of the defencestructures, calculation of overtopping volumes using EurOtopcan be undertaken. Resultant volumes can then be routedoverland behind the defences using MIKE 21 or MIKEFLOOD.USING MIKE FLOOD AD & ECO LAB TO MODEL POLLUTEDFLOOD WATERS AND RIVERINE WATER QUALITYMIKE FLOOD now includes the option for a fully dynamic 1D-2DAdvection Dispersion coupling, which increases the range ofapplications substantially.The new AD coupling in MIKE FLOOD enables users to simulatenew interesting aspects such as: - Floodplain contamination from polluted rivers. Impact assessment on river quality from pollutant sources inflood prone areas during flood events. The impact on concentrations of river pollutant in case of arelease from an urban Combined Sewer Overflow.MIKE FLOOD AD can be further enhanced by ECO Lab foradvanced water quality simulations.ECO Lab is the complete numerical laboratory for waterquality and ecological modelling. You can develop exactly themodel you need and describe the processes you wish. Noecological problem is too simple or too complicated for ECO Lab: Open Equation solver for coupled ordinary differentialequations. Designed for point descriptions of processes of chemistry,ecology, etc. All equations, parameters contained in flexible, portable ECOLab templates (use DHI supported templates or create yourown). Integrated with DHI’s hydrodynamic models: Currently MIKE11, MIKE 21 (hence MIKE FLOOD), MIKE 3 & MIKE SHE.Photo:iStock©MikeBentley
  4. 4. ©DHI4GROUNDWATER FLOODINGMIKE SHE delivers truly integrated modelling of groundwater,surface water, recharge and evapotranspiration - all importantaspects of hydrology when your project requires a fullyintegrated model. No other tool or combination of tools canmatch MIKE SHE in terms of seamless integration of all theimportant processes of the hydrological cycle.MIKE SHE includes 2D overland flow capabilities and fullriverine hydrodynamics (with MIKE 11) delivering a powerful1D-2D flood modelling tool when evapotranspiration,infiltration and groundwater are relevant.For detailed groundwater-surface water interaction studies(including water quality), MIKE SHE includes 3D, finitedifference groundwater flow, which discharges groundwaterdrainage directly to surface water.An unrivalled dynamic coupling of MIKE SHE with MIKEURBAN is also available allowing the accurate modelling ofthe two-way interaction between pipes in the ground and thesurrounding aquifer. This facilitates the modelling of infiltrationto and leakage from pipes as well as modelling of the potentialside effects of infiltration prevention.MORPHOLOGYThe primary long term factors affecting river hydrodynamics,and flood risk, are climate change and urbanisation. However,the consideration of other factors may also be critical.Morphological change, for example, is too often limited to theconsideration of scour or silting at structures, and to thedevelopment of river maintenance schemes.For broad scale sediment transport studies, MIKE 11 may besufficient. However, to inform the detailed design of flooddefences or other structures, bank stability assessments, andto assess the effectiveness and impact of erosion controlmeasures (hard or soft engineered) on river health and futurehabitats (e.g. fish spawning grounds) the MIKE 21 FlexibleMesh series is preferred. More advanced morphologicalmodelling - including planform change - is possible usingMIKE 21C (Curvilinear Grid).The transition from 1D to 2D modelling is streamlined by theautomatic generation of 2D bathymetries from MIKE 11.MIKE BY DHI DELEGATE PACK - ICE FLOODING 2013DHI Water Environments (UK) LtdDavidson HouseForbury SquareReading, RG1 3EUUnited Kingdom+44 (0)1189 000745 DHIDHI are the first people you should call when you have a tough challenge to solve in a waterenvironment. Whether it is a river, a reservoir, an ocean, a coastline, within a city or a factory. Ourworld is water, and our knowledge of water environments is second-to-none. It represents 50 yearsof dedicated research, and real-life experience from more than 140 countries.We strive to make this knowledge globally accessible to clients and partners by channelling itthrough our local teams and unique software.So whether you need to save water, share it fairly, improve its quality, quantify its impact or manageits flow, we can help. Our knowledge, combined with our team’s expertise and the power of ourtechnology, hold the key to unlocking the right solution.MINING & MINE WATER MANAGEMENT: A FOCUS ONFEFLOWMine flooding can not only alterunderground hydrogeology, butalso cause the collapse of mineworkings (potentially exacerbatinggroundwater related floodingelsewhere), ground subsidenceand damage to surface structuresboth in the mine and in thesurrounding area. FEFLOW canbe used to predict the locationsand severity of flooding within amine and to model the long termperformance of flooding control measures, as well as optimisedewatering works (emergency or long term), in operational andabandoned mine workings. FEFLOW can also be used todevelop effective early warning systems, to validate remediationschemes for groundwater contaminated by mining activity, and toassess the risk of uncontrolled discharge to surface waters ofpollutants mobilised by rising flood waters within the mine.FEFLOW is our state-of-the-art integrated groundwater softwarepackage for the modelling of fluid flow, transport of dissolvedconstituents and heat transport processes in the subsurface.FEFLOW links with MIKE 11 for groundwater - surface waterinteraction problems (river flow).CLIMATE CHANGE ADAPTATIONDHI has developed a set of ClimateChange Guidelines. For your free copyplease visit climatechange.dhigroup.comASSESSING THE IMPACTS OF RURAL LAND MANAGEMENTCHANGE ON FLOODING AND FLOOD RISK (THECATCHMENT APPROACH)MIKE SHE is a very powerful tool forassessing the effects of natural floodmanagement schemes in the UK. Thesoftware has been used extensively formodelling wetland restoration in upland areasin different parts of the world.The effects of tree planting, water meadows, and other riparianplanting can be described by land use changes in the model andthe impacts on evapotranspiration, unsaturated flow and surfacerunoff examined. It is also possible to describe the detention ofwater in the floodplain (e.g. as a result of tree planting,landscaping, etc).The effects of cutting off drains, and altering surface flow routes,can be modelled using the MIKE SHE 2D Overland Flow module.Channel restoration and green bank protection can be handledby coupling to MIKE 11.Natural flood management has many benefits (habitat creation,nature conservation, diffuse pollution mitigation, etc) and is ofparticular interest in rural rapid response catchments; where it isnot always possible to provide flood defences.Photo:iStock©ВасилийТороус