Flood Risk Modelling and Mapping
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Transcript of Flood Risk Modelling and Mapping
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Flood Risk Modelling and Mapping Claus Skotner Head of Projects, Water Resources, DHI
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Challenges and Technology Requirements
4 November, 2013 © DHI #2
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Drought
Irrigation
Hydropower
Domestic
water
Water
quality
Challenges
Trans-boundary
Floods Droughts Operational Seasonal Strategic Flood
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Technology Requirements
Integrated – From planning to operation – from information management, analyses, modelling, impact assessment,
and mitigation to crisis management
Open – Data – models – spatial components; API for user adaptation
Robust – Resilient and redundant - proven software
Expandable – Start small – end up with a large system
Supported – Important for any mission critical system
Accepted
Trusted
Sustainable
© DHI 4 November, 2013 #4
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Solutions
4 November, 2013 © DHI #5
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Modern solutions help you…
© DHI
…manage, organise and
analyse large amounts
of data
…make wise and robust
water management
decisions
…get the full benefit of
real-time monitoring and
early warning systems
…optimise operations
and planning
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Modelling the world of water
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1D – River modelling
• Flood analysis and mapping
• Design of flood alleviation systems
• Dam break analysis
• Analysis and design of hydraulic structures
• Drainage and irrigation studies
• Water quality modelling
• Sediment modelling
• Optimisation of river and reservoir operations
• Real-time flood, inflow and release forecasting
• …
• Soil and land use maps
• Basin topography
• River alignment and cross-sections
• Embankments
• Structure geometry
• Rule curves
• Precipitation
• Potential evapotranspiration
• River flow and water level
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1D - Urban modelling
• Water distribution
Water distribution modelling under steady state, extended period
and water hammer flow conditions.
Including water quality and real-time control.
• Collection system
Wastewater and Storm water simulations with rainfall-runoff,
pollution transport and sediment transport including advanced real-
time control
• Drainage and suply network
• Pipe information
• Embankments
• Pump charateristics
• Operational rules
• Pipe flow
• Pumping
• Water supply and use
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2D - Spatially distributed modelling
• Supports the same applications as for 1D but offers
more detail and accuracy
• Limited size of study area
• Increased computation time
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Initial elevation grid
Lowering by 20 cm places
where there are streets
Grid with streets
Raising by 5 m places where
there are buildings
Final grid with streets
and buildings
Where do we get flooding ?
2D - Building the topographical model basis
© DHI
• Digital terrain model
• Infrastructure maps
… plus relevant forcing terms
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1D-2D – Dynamic model coupling
1D urban flow component
2D surface flow component
1D rural flow component
“Integrated modelling of rivers, flood plains
and drainage systems help mitigating flood
risk because you consider the entire
system in one full analysis”
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Integrated catchment modelling
• Groundwater management and planning
• Surface water impact from groundwater
withdrawal
• Conjunctive use of groundwater and
surface water
• Wetland management and restoration
• Aquifer vulnerability mapping with
dynamic recharge and surface water
boundaries
• Impact studies for changes in land use
and climate
• Impact studies of agricultural practices
including irrigation, drainage and nutrient
and pesticide management
• Soil and land use maps
• Acquifer maps
• Digital terrain model
… plus 1D data requirements
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Sample Applications
6 December, 2012 © DHI #14
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Nile Basin Decision Support System
© DHI
The Nile Basin Decision Support System
will provide the basis for agreement on
and development of sustainable water
resources projects in the Nile Basin”
Dr. Abdulkarim H. Seid, Head, Water Resources
Management, Nile-Sec
Accepted tools
Sharing of data and knowledge
Cross boundary cooperation
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© DHI
Nile Basin Decision Support System Nile River Basin
Africa NB DSS
Time series
GIS
Scenarios
Scripting Indicators
Spread-sheets
Work spaces
Meta data
Dashboard (web
publishing)
Optimisation
Ensembles
MCA/CBA
Data base
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Computer Aided River Management System
© DHI
New South Wales, Australia
CARM is a world class development
designed to maximise the efficiency of the
Murrumbidgee River system.”
Brett Tucker, Chief Executive Officer, State Water
Corporation, New South Wales, Australia
Over 1,600km of river with two
dams and thousands of water
users. One river management
system.
Precision releases to deliver the right flows at
the right time
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Murrumbidgee Catchment
4 November, 2013 © DHI #18
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Irrigation
• Irrigation and environment are
biggest water users
• Murrumbidgee and Coleambally use
50% and 20% of all irrigation water.
4 November, 2013 © DHI #19
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Water Infrastructure
4 November, 2013 © DHI #21
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Previous River Operations
4 November, 2013 © DHI #22
• Water orders aggregated upstream to
dams
• Assumes water moves as parcels
between gauges at fixed daily travel
times
• Limited use of real time and forecast
data (flows, rainfall, demands)
• Manual daily operation requires
extensive operator experience and
judgement
• Aging technology
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Grid data from
Bureau of
Meteorology
Automatic
telemetry data
Demand
forecasting
MIKE BASIN
Catchment
inflow
forecasting
MIKE 11 RR
Release
optimization
AUTOCAL
Hydraulic
forecasting
MIKE 11 HD
Forecasting of
losses and gains
MIKE SHE
Forecasting of
losses and gains
MIKE SHE
Data assimilation
for state
updating
Solution
MIKE 11
MIKE SHE
MIKE BASIN
MIKE CUSTOMISED
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Catchment Inflow Forecasting – MIKE 11 RR
• Continuous, hourly timestep
• Auto-calibration
• 25 catchment models
established and calibrated
• Utilises real time rainfall
observations and grid based
forecasts from Bureau of
Meteorology
4 November, 2013 © DHI #24
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River Hydraulics – MIKE 11 HD, SO, DA
• 3000 km river
• 200 wetlands
• 17 controllable structures,
25 fixed crest weirs
4 November, 2013 © DHI #25
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Innovation forecast
Time in forecasting period
State variable
Time in forecasting period
Model prediction
Updated
Hypothetical measurement
Innovation
Time in filtering period
State variable
Time in filtering period
Model prediction
Updated
MeasurementHindcast
period:
Forecast
period:
Why Data Assimilation?
Accurate state at time of forecast
Better forecast accuracy
Data Assimilation
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Losses and Gains – MIKE SHE
• Integrated hydrology
• Near bank ET, bank storage and groundwater inflows/outflows
4 November, 2013 © DHI #27
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Real time data feeds
Process modelling and optimisation
Output results and analysis
River Operator – MIKE CUSTOMISED
River Operator
Tailored solution – yet off-the-shelf
”Simple for users, complex underneatth”
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Solution at Server Side
4 November, 2013 © DHI #29
Solution at Server Side
Cluster of models servers
Parallel computing
System interfaces
Redundancy
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Approach to Optimisation
Objectives:
• Schedule releases to match demands
• Meet environmental flow requirements
• Flood protection
Step 1a Dynamic lagging of catchment inflows, demands, river losses and gains
Step 1b Assimilation during hindast period – initial solution for releases in forecast period
Step 2 Optimisation based on initial solution
4 November, 2013 © DHI #30
Constraints:
• Minimum-maximum river flows
• Minimum operating levels at regulators
• End of system flows
Result
Regulator set points for the next 6 hours
communicated through OPC
Time of forecast Hindcast period Forecast period
6 hours
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Early forecast and warning systems
© DHI
Chao Phraya, Thailand The Chao Phraya River Basin.
160,000km2. One Decision
Support System to protect
against devastating flooding.
You can too – with our software platform
HAII highly appreciates DHI for their
excellent job, especially on the close
collaboration and hands on experience
that made us become a good partner.”
Dr. Piyamarn Sisomphon, Project Leader, Hydro and Agro
Informatics Institute
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Early forecast and warning systems
© DHI
Chao Phraya, Thailand
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For info or further questions on this presentation, or on the activities of the
JASPERS Networking Platform please contact:
Massimo Marra JASPERS Networking Platform Officer
ph: +352 4379 85007
www.jaspersnetwork.org
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