hydroinformatics and some of its roles in the view of climate variability
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Presentation at Agua2009, November 2009 in Cali, Colombia. Dimitri SolomatineTRANSCRIPT
1
AGUA 2009
Hydroinformaticsand some of its roles in the view
of climate variability
Dr. Dimitri P. SolomatineProfessor of Hydroinformatics
D.P. Solomatine. Hydroinformatics.2
Quick start: role of uncertaintyin flood management
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Alarm level
Prediction interval (uncertainty)
Deterministic forecast
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So, issue a flood alarm or not?..
D.P. Solomatine. Hydroinformatics.3
Climate is changing…
http://www.globalwarmingart.com/wiki/File:Holocene_Temperature_Variations_Rev_png
D.P. Solomatine. Hydroinformatics.4
Global warming
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Variability in annual temperatures locallySource: www.john-daly.com, based on data from NASA Goddard Institute (GISS), USA, and Climatic Research Unit (CRU) of the University of East Anglia, Norwich, UK
D.P. Solomatine. Hydroinformatics.6
Climate is changing…
There are many factors leading to changes in the rate of climate change
Whatever the main reason is, the climate variations prompt fordeveloping the water management strategies that take climate uncertainties into account
the need for More observation systemsBetter predictive modelling toolsAnalytical methods to handle uncertaintyChanges in design and adaptive management practicesChanges in educational programmes at all levels
These issues are the current focus of Hydroinformatics
D.P. Solomatine. Hydroinformatics.7
Encapsulation of knowledge related to water
Tacit (implicit) knowledge embedded within a personWords, texts, images
printedstored in electronic media
Mathematical modelsformulas, algorithmsalgorithms encapsulated in computer programs (software)
Integrated systems encapsulating all of above -Hydroinformatics systems
D.P. Solomatine. Hydroinformatics.8
Hydroinformatics
modelling, information and communication technology, computer sciences
applied to problems of aquatic environment
with the purpose ofproper management
1991
2008
D.P. Solomatine. Hydroinformatics.9
Flow of information in a Hydroinformatics system
Earth observation, monitoring
Numerical Weather Prediction Models
Data modelling, integration with hydrologic and hydraulic models
Access to modellingresults
Data Models Knowledge Decisions
Decision support
Map of flood probability
D.P. Solomatine. Hydroinformatics.10
Where is data coming from?
D.P. Solomatine. Hydroinformatics.11
Modellingis the heart of Hydroinformatics
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=+−∂∂
+⎟⎟⎠
⎞⎜⎜⎝
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+∂∂
fo gASgASx
hgA
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Q
xt
Q
D.P. Solomatine. Hydroinformatics.12
Modelling
Model is …a simplified description of realityan encapsulation of knowledge about a particular physical or social process in electronic form
Goals of modelling are:understand the studied system or domain (the past)predict the future use the results of modelling for making decisions (change the future)
D.P. Solomatine. Hydroinformatics.13
Modelling is at heart of Hydroinformatics
Hydroinformatics deals with the technologies ensuring the whole information cycle, and integrates
data, models,
people
D.P. Solomatine. Hydroinformatics.14
Main modelling paradigms
Physically-based model (process, simulation, numerical) is based on the understanding of the underlying processes
Data-driven model is based on the recorded values of variables characterising the system. They need less knowledge about the physical behaviour
Agent-based model consists of dynamically interacting relatively simple rule-based computational codes (agents)
D.P. Solomatine. Hydroinformatics.15
Applications of models
River/urban flood forecasting and managementReservoir operationsSediment transport and morphologyEcology and water qualityStorm surges and coastal floodingDredging and reclamationUrban sewers and drainageWater distribution networksetc.
D.P. Solomatine. Hydroinformatics.16
Example: a physically-based model of open channel flow: Saint Venant equations
The 1D continuity and momentum equations for open channel flow are also referred as Saint Venant equation
Form a pair of non-linear hyperbolic partial differential equations in Q (flow) and h (depth)
Analytically can not be solvedNumerically can be solved using
finite differences (explicit, implicit schemes), finite elements
Lqx
Q
t
A=
∂∂
+∂∂
02
=+−∂∂
+⎟⎟⎠
⎞⎜⎜⎝
⎛∂∂
+∂∂
fo gASgASx
hgA
A
Q
xt
Q
x=distance, t=time, A=cross-section, S0=bottom slope, Sf=energy grade line slope, B=width
Continuity equation
Momentum equation
D.P. Solomatine. Hydroinformatics.17
Why 2D/3D modelling?Often 1D model is not enough
Horizontal velocity fields Vertical velocity fields
D.P. Solomatine. Hydroinformatics.18
Some examples of using modellingin water-related issues
D.P. Solomatine. Hydroinformatics.19
Warragamba Dam, Australia
Warragamba Dam - 65 km west of Sydney in the Burragorang Valley
provides the major water supply for SydneyWarragamba River flows through a 300-600 m wide gorge, about 100 m deep before opening out into a large valley. This allows a relatively short and high dam to impound a vast quantity of water.
A dam break of the WarragambaDam would be a major disaster. SOBEK (Delft Hydraulics) software was used for simulation
D.P. Solomatine. Hydroinformatics.20
Warragamba Dam, AustraliaSimulation of the dam break with SOBEK by Deltares
The animation shows the simulation results. They may be used for disaster management, evacuation planning, flood damage assessment, urban planning
D.P. Solomatine. Hydroinformatics.21
Models are indispensable in dealing with floods
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Example: Hydroinformatics systems for flood warning – MIKE FloodWatch
MIKE Flood Watch (Danish Hydraulic Institute), a decision support system for real-time flood forecasting:
advanced time series data base MIKE 11, for hydrodynamic modelingMIKE 11 FF, real-time forecasting system, ArcView, Geographical Information System (GIS)
D.P. Solomatine. Hydroinformatics.23
Hydroinformatics systems for flood warning: MIKE FloodWatch
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Ecosystem Integrated Model:a Case Study for Sonso Lake, Colombia
Problem: 70% of the surface area of this shallow lake is covered by an invasive macrophite Water HyacinthCauses:
Nutrients pollution from agricultural use of landLack of sustainable management of the lake
Methodology:Ecological modelling of Water HyacinthIts integration with hydrodynamic modelAnalysis of Alternatives to Manage the Water Hyacinth Infestation
D.P. Solomatine. Hydroinformatics.25
Ecosystem Integrated Model: a Case Study for Sonso Lake, Colombia
Ecosystem
Hydrodynamic
Water Quality
Sobek Rural1D2D
Sobek RuralDELWAQ
Water Hyacinth Model (coded using SOBEK RURAL Open
Process Library)
Water HyacinthNH4
NO3
Norg Porg
PO4
Organic Matter Settled
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Solar Radiation
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5Water Volume
2 3
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4VelocityWater Depth
Flow
SEDIMENT
WATER SURFACE5
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1. Input / Output2. Rainfall3. Evapotranspiration4. Advection/Dispersion
5. Input / Output6. Input / Output7. Sedimentation8. Resuspension
13. Photosynthesis14. Respiration15. Mortality16. Losses
9. Resuspension10. Hydrolysis11. Oxidation 12. Uptake/Growth
PROCESSES
Ref: MSc study by Carlos Velez (Colombia), UNESCO-IHE & Delft Hydraulics
D.P. Solomatine. Hydroinformatics.26
Processes included:Growth and MortalityRespiration/PhotosynthesisTransportation by flow and windUptake/release of Nutrients from the waterMechanical, Biological and Chemical Control Options
Hydrodynamic Model 1D River and 2D Lake (Water Level)
Nutrients Model (Phosphate PO4)
Water Hyacinth Integrated Model(Plant Density)
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Beyond “classical” modelling:current developments in Hydroinformatics
Machine learning in data-driven modelling
Multi-objective optimisation
Information theory
Predicting models’ uncertainty
Integration
D.P. Solomatine. Hydroinformatics.28
Data-Driven Modelling
Uses (numerical) data (time series) describing some physical processEstablishes functions that link variables
outputs = F (inputs)Valuable when physical processes are unknownAlso useful as emulators of complex physically-based models (surrogate models)
Input dataModelled
(real)system
X
Actual (observed) output Y
Machinelearning
(data-driven)model Predicted output Y’
Learning is aimedat minimizing this
difference
Input dataModelled
(real)system
X
Actual (observed) output Y
Machinelearning
(data-driven)model Predicted output Y’
Learning is aimedat minimizing this
difference
D.P. Solomatine. Hydroinformatics.29
Example of a data-driven model
observed data characterises the input-output relationship X Ymodel parameters are found by optimizationthe model then predicts output for the new input without actual knowledge of what drives Y
Linear regression model
Y = a0 + a1 X
X (e.g. rainfall)
Y (e.g., flow)
new input value
actual output value
model predicts new output value
Which model is “better”:green, red or blue?
D.P. Solomatine. Hydroinformatics.30
Data-driven rainfall-runoff models: Case study Sieve (Italy)
mountaneous catchment in Southern Europearea of 822 sq. km
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SIEVE: visualization of data
variables for building a decision tree model were selected on the basis of cross-correlation analysis and average mutual information:
inputs: rainfalls REt, REt-1, REt-2, REt-3, flows Qt, Qt-1
outputs: flows Qt+1 or Qt+3
FLOW1: effective rainfall and discharge data
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Using data-driven methods in rainfall-runoff modelling
Available data:rainfalls Rtrunoffs (flows) Qt
Inputs: lagged rainfalls Rt Rt-1 … Rt-LOutput to predict: Qt+T
Model: Qt+T = F (Rt Rt-1 … Rt-L … Qt Qt-1 Qt-A … Qtup Qt-1
up …)(past rainfall) (autocorrelation) (routing)
Questions: how to find the appropriate lags? how to build non-linear regression function F ?
Linear regression, neural network, support vector machine etc.
QQtt
QQttupup
RRtt
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Artificial neural network: a universal function approximator (=non-linear regression model)
u F a a x
j= ,..., N
j oj ij ii
N
hid
inp
= +⎛
⎝⎜⎜
⎞
⎠⎟⎟
=∑
1
1
y F b b u
k= ,..., N
k ok jk ji
N
out
hid
= +⎛
⎝⎜⎜
⎞
⎠⎟⎟
=∑
1
1
There are (Ninp+1)Nhid + (Nhid+1)Nout parameters (weights) to be identified by optimisation process (training)
Hidden layer
a ij
Inputs
x 1x 2
x 3
x nOutputs
y1
y2
y3
ym
u 1x
u s
b jkweights weights
v
F(v)1
0 Non-linear sigmoid function: F(v) = 1/ (1 + e-v)
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Neural network tool interface
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ANN verification RMSE=11.353NRMSE=0.234COE=0.9452
MT verificationRMSE=12.548NRMSE=0.258COE=0.9331
SIEVE: Predicting Q(t+3) three hours ahead(ANN learned the relationship btw rainfall and flow)
Prediction of Qt+3 : Verification performance
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Use of machine learning (data-driven) models in water resources
Hydrological modellingWater demand forecastingPrediction of ocean surgesModels of wind-wave interactionSedimentation modelling
Meta-models (emulating, fast models) of water systems –to replace complex physically-based models
D.P. Solomatine. Hydroinformatics.37
MULTI-OBJECTIVE OPTIMIZATION
Finding variables’ values that bring the value of the “objective function” to a minimumIn water resources many problems require solving an optimization problem
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Many optimization problems in water resources are multi-objective
there are several objectives that are to be optimized often they are in conflict, i.e. minimizing one does not mean minimizing another onea solution (the set of decision variables) is always a compromiseExamples:
multi-purpose reservoir operationelectricity generation vs. irrigation vs. navigability
models calibration (error minimization)models good "on average" vs. good for particular hydrologic conditions (floods)
pipe networks optimization (design and rehabilitation)costs vs. reduction of flood damage
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Model-based optimization of urban drainage network
MOUSE modelling system (DHI Water and Environment)1D model of free-surface flow is used
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Flo
od D
amag
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Costs
Urban drainage system rehabilitation:use of multi-objective optimization
rehabilitation: changing pipes, creating additional storagesoptimization by multi-objective genetic algorithm: find a compromise btw. min. cost and min. damage due to flooding
Wastewater System Pipe Network Model (MOUSE)
Optimization Procedure (GLOBE, NSGA-II)
Data Processor Data Processor
Compromise optimal solutions
D.P. Solomatine. Hydroinformatics.41
INFORMATION THEORY
Shannon entropy provides a mathematical framework to evaluate the amount of information contained in a data series
Average mutual information (AMI) is measure of information available from one set of data having knowledge of another set of dataAMI can be used to investigate dependencies and lag effects in time series data
2logH p p= −∑
2,
( , )AMI= ( , ) log
( ) ( )XY i j
XY i jX i Y ji j
P x yP x y
P x P y
⎡ ⎤⎢ ⎥⎢ ⎥⎣ ⎦
∑
D.P. Solomatine. Hydroinformatics.42
Information theory and optimization for sensors locations for contaminant detection
in water distribution systemsThree criteria considered:
ConcentrationVolume of contaminated water delivered Time of detection
PhD research of Mr. Leonardo Alfonso, UNESCO-IHE. L. Alfonso , A. Jonoski , D.P. Solomatine. Multi-objective optimisation of operational responsesfor contaminant flushing in water distribution networks. ASCE J. Water Res. Plan.Manag., 2009.
D.P. Solomatine. Hydroinformatics.43
Multi-objective optimization of sensors locations to detect contamination
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Tank A
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Time of Detection
Contaminated Volume
Contaminant concentration
Locations found using different method
Location of 5 sensorsScenario: 2 sources of pollution
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Average mutual information in optimizing the structure of a Neural Network model
Rainfall-runoff forecasting model:Qt+T = F (Rt Rt-1 … Rt-L … Qt Qt-1 Qt-A)
(past rainfall) (autocorrelation)
Finding optimal lags between Qt+T and rainfall Rt
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QQttRRtt
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UNCERTAINTY
Uncertainties associated with climate change are very highDifferent IPCC scenarios lead to very different results of water modelsAny study exploring the impacts of CC needs powerful tools for analysing and predicting uncertainty
D.P. Solomatine. Hydroinformatics.46
Uncertainty in flood management:evacuate?
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Point forecasts vs. Uncertainty bounds
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Sources of uncertainty in modelling
Inputs Model parameters Calibration data
Model
X(t) Q(t)p
y = M(x, s, θ) + εs + εθ + εx + εy
D.P. Solomatine. Hydroinformatics.49
Monte Carlo simulation of parametric uncertaintyy = M(x, s, θ) + εs + εθ + εx + εy
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Uncertainty analysis: issues
Most methods are aimed at analysing average model uncertainty, but not predicting it for the new inputsMost uncertainty analysis studies focus on the parametric uncertainty only. More has to be done to analyse and predict:
Input data uncertaintyResidual uncertainty (uncertainty associated with the deficiencies of the “optimal” model)
Model uncertainty is estimated. What next?:Should we combine in an ensemble several “good” models, instead of using one calibrated model?How can we predict model uncertainty for the future situations?How to communicate uncertainty to decision makers?
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UNEEC: Novel uncertainty prediction method
A calibrated model M of a water system is consideredM is run for the past hydrometeorological eventsIt is assumed that the errors of model M characterize the “residual” uncertainty in different situations (events)This data is used to train the machine learning model Uthat predicts the error (uncertainty) of model M, which is specific for a particular hydrometeorological event
UNEEC-M: parametric and input uncertainty is added as well
D.P. Solomatine, D.L. Shrestha. A novel method to estimate model uncertainty using machine learning techniques. Water Resources Res., 45, W00B11, doi:10.1029/ 2008WR006839, 2009.
D.P. Solomatine. Hydroinformatics.52
UNEEC: fuzzy clustering and ANN in encapsulating the model uncertainty
New record. The trained f L and f U models will estimate the prediction interval
Error limits(or prediction intervals)
Flow Qt-1
Rainfall Rt-2
past records (examples in the space of inputs)
Error
Train regression (ANN) models:
PIL = fL (X)PIU = fU (X)
iμ∑
i
N
iμ∑
=1
i
N
iμ∑α
=12/
i
N
iμ∑α−
=1)2/1(
Prediction interval
Error distribution in cluster
D.P. Solomatine. Hydroinformatics.53
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Estimated prediction bounds: verification (Bagmati river basin, Nepal)
LZ
UZ
SM
RF
R
PERC
EA
Q=Q0+Q1Q1
Transformfunction
SP
Q0
SF
CFLUX
IN
SF – Snow
RF – Rain
EA – Evapotranspiration
SP – Snow cover
IN – Infiltration
R – Recharge
SM – Soil moisture
CFLUX – Capillary transport
UZ – Storage in upper reservoir
PERC – Percolation
LZ – Storage in lower reservoir
Qo – Fast runoff component
Q1 – Slow runoff component
Q – Total runoff
LZ
UZ
SM
RFRF
RR
PERCPERC
EAEA
Q=Q0+Q1Q1Q1
Transformfunction
SP
Q0Q0
SFSF
CFLUXCFLUX
ININ
SF – Snow
RF – Rain
EA – Evapotranspiration
SP – Snow cover
IN – Infiltration
R – Recharge
SM – Soil moisture
CFLUX – Capillary transport
UZ – Storage in upper reservoir
PERC – Percolation
LZ – Storage in lower reservoir
Qo – Fast runoff component
Q1 – Slow runoff component
Q – Total runoff
D.P. Solomatine. Hydroinformatics.54
Hydroinformatics is aboutINTEGRATION
of data, models and people
D.P. Solomatine. Hydroinformatics.55
HBV
Integration of atmospheric, hydro- and environmental models, data systems
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Integration of models, communications and people
Internet – models on demand, distributed DSSMobile telephony – a channel for hazards warnings and advice systems
Ref: MSc by L. Alfonso (Colombia), UNESCO-IHE
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Integration of Hydroinformatics systems and decision making
Multi-criteria, multi-stakeholder scenario analysisCommunication of model uncertainty to managers
Map of flood probability
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Education:Hydroinformatics at UNESCO-IHE,
Delft, The Netherlands
D.P. Solomatine. Hydroinformatics.59
Postgraduate Education, Training Postgraduate Education, Training and Capacity Building and Capacity Building
in Water, Environment and Infrastructurein Water, Environment and Infrastructure
D.P. Solomatine. Hydroinformatics.60
UNESCO-IHE: 14,000 Alumni
UNESCO-IHE Alumni Community
0 - 50 51-150 151-300 301-500 501-850 851-1200
D.P. Solomatine. Hydroinformatics.61
Hydroinformatics Masters programme
Fundamentals, hydraulic, hydrologic and environmental processes Fundamentals, hydraulic, hydrologic and environmental processes
PhysicallyPhysically--based based simulation modelling simulation modelling
and toolsand tools
Information systems, GIS, communications, InternetInformation systems, GIS, communications, Internet
DataData--driven modelling driven modelling and computational and computational intelligence toolsintelligence tools
Integration of technologies, project managementIntegration of technologies, project management
Elective advanced topics
Systems analysis, Systems analysis, decision support, decision support,
optimizationoptimization
•• ArcGISArcGIS•• AccessAccess
•• SOBEKSOBEK•• RIBASIMRIBASIM•• Delft 3DDelft 3D•• SWATSWAT•• EPANETEPANET•• MOUSEMOUSE•• AquariusAquarius
•• MIKE 11MIKE 11•• HECHEC--RASRAS•• MIKE 21MIKE 21•• MIKE SHEMIKE SHE•• RIBASIMRIBASIM•• WEST++WEST++•• MODFLOWMODFLOW
•• LINGOLINGO•• GLOBEGLOBE•• BSCW BSCW •• AquaVoiceAquaVoice
•• NeuroSolutionsNeuroSolutions•• NeuralMachineNeuralMachine•• AFUZAFUZ•• WEKAWEKA
•• MatlabMatlab•• DelphiDelphiToolsTools
•• JAVA JAVA •• UltraDevUltraDev
with applications to:with applications to:-- River basin managementRiver basin management-- Flood managementFlood management-- Urban systemsUrban systems-- Coastal systemsCoastal systems-- Groundwater and Groundwater and catchment hydrologycatchment hydrology
-- Environmental systemsEnvironmental systems(options)(options)
D.P. Solomatine. Hydroinformatics.62
Hydroinformatics Study Modules
Introduction to Water science and EngineeringApplied Hydraulics and hydrologyGeo-information systemsComputational Hydraulics and Information ManagementModelling theory and applicationsComputational Intelligence and Control SystemsRiver Basin ModellingFieldtrip to Florida, USASelective modelling subjects (2 modules each):
Flood risk managementUrban water systems modellingEnvironmental systems modelling
Hydroinformatics for Decision SupportGroupworkResearch proposal drafting and Special TopicsMSc research
D.P. Solomatine. Hydroinformatics.63
Examples of MSc topics
Hydroinformatics for real time water quality management and operation of distribution networks, case study Villavicencio, ColombiaWater distribution modelling with intermittent supply: sensitivity analysis and performance evaluation for Bani-Suhila City, PalestineUrban Flood Warning System with wireless technology, case study of Dhaka City, BangladeshFlood modelling and forecasting for Awash river basin in EthiopiaHarmful Algal Bloom prediction, study of Western Xiamen Bay, ChinaApplication of Neural Networks to rainfall-runoff modelling in the upper reach of the Huai river basin, ChinaHeihe River Basin Water Resources Decision Support SystemDecision Support System for Irrigation Management in Vietnam1D-2D Coupling Urban Flooding Model using radar data in BangkokUsing chaos theory to predict ocean surge
D.P. Solomatine. Hydroinformatics.64
A new programme is planned:International Masters in Hydroinformatics
UNESCO-IHE – UniValle-Cinara
jointly delivered byUNESCO-IHE Institute for Water Education,
Delft, The Netherlandsand
Universidad del Valle (UNIVALLE, Cinara), Cali, Colombia
and leading to the degree of Master of Science in Water Science and Engineering, specialisation in
Hydroinformatics,
accredited by the Dutch Ministry of Education
Planned to start in September 2010Fliers are available
Hidroinformáticamodelación y sistemas de información para la gestión del agua
Programa Internacional de Maestría en Ciencia
D.P. Solomatine. Hydroinformatics.65
Programme structure
Period: Mid-October – mid-April. Public MSc defence and graduation –end of April
ECTS36
Location: Any of the core or the associated partners (at least the last month at UNESCO-IHE)
Block 4:MSc Thesis research
Period: Begin-September – Mid-October ECTS
10
Location: Any of the core partners (in the beginning UNESCO-IHE)
Block 3:MSc thesis proposal preparation + special topics
Thesis part
Period: Mid-January – end-August: 9 modules of the existing UNESCO-IHE WSE-HI programme (modules 4-12)
ECTS45
Location UNESCO-IHEBlock 2:Hydroinformatics theory and applications
Period: September-January
ECTS15
Location: UNIVALLE, CaliBlock 1: Fundamental subjects for hydroinformatics
Taught part
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What Hydroinformatics alumni say...
the course has opened the new horizons in my professional life
D.P. Solomatine. Hydroinformatics.67
Conclusion
Hydroinformatics is a unifying approach to water modelling and managementSpecialists in hydroinformatics play an integrating role linking various specialists and decision makersAccess to information by widening groups of stakeholders leads to democratisation of water servicesOne of the roles of Hydroinformatics is developing analytical methods to deal with climatic variability in modelling and management practiceFocus should be on education and training
D.P. Solomatine. Hydroinformatics.68
…more data is needed…