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4/28/2010
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Australian Rainfall and RunoffA guide to runoff estimation
ARR Project 15Two Dimensional Simulation
in Urban Areas
Mark BabisterWMAWater , Chair NCWE
Australian Rainfall and Runoff A guide to runoff estimation
WORKSHOP TEAM
The Project 15 workshop members were (* indicate contributing authors to the Project 15 report):
Mark Babister (Project Manager) - WMAwater * James Ball (ARR Editor) UTS * Roger Austin Wallingford Cathie Barton * Warwick Bishop Water Technology * Ben Caddis - WBM Stephen Gray - WMAwater * Rhys Hardwick Jones - WMAwater * Martin Lambert Uni of Adelaide John Macintosh - Water Solutions Andrew McCowan Water Technology * Steve Muncaster Water Technology *
4/28/2010
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Australian Rainfall and Runoff A guide to runoff estimation
John Murtagh NSW DECC * Bill Peirson UNSW (WRL) * Brett Phillips Cardno * Habib Rehmann - Golder Monique Retallick - WMAwater * Ted Rigby - Rienco Grantley Smith UNSW (WRL) * Bill Syme - WBM * Stefan Szylkarski - DHI * Chris Thomas Worley Parsons Rhys Thompson Cardno * Eric Valentine - CDU Rudie Van Drye Bill Weeks QLD Main Roads*
WORKSHOP TEAM
Australian Rainfall and Runoff A guide to runoff estimation
OUTLINE
Background
Aim
Approach
Workshop team
Report Structure
Recommendations
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Australian Rainfall and Runoff A guide to runoff estimation
INTRODUCTION
One of 21 research projects to fill knowledge gaps
The next edition of ARR will provide guidance on appropriate usage
The aims of the project, therefore, were to develop guidance on:
model conceptualisation and representation of hydrolog ical and hydraulic processes, inclusive of loss modelling;
influence of the conceptualisation on the input data; influence of the conceptualisation on parameter estimat ion and
the uncertainty in parameter estimation; predictive uncertainty; and analysis of model output.
No promotion of software
Australian Rainfall and Runoff A guide to runoff estimation
IDENTIFIED NEED FOR GUIDENCE
2D models have become tool of choice
2D model better represents storage which challenges aspects of ARR 87 peak burst approach
latest trend in Australian practice is to use 2D models as finely distributed hydrological models
4/28/2010
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Australian Rainfall and Runoff A guide to runoff estimation
2D Model Uses Urban Redevelopment
Australian Rainfall and Runoff A guide to runoff estimation
2D Model Uses - Infrastructure
4/28/2010
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Australian Rainfall and Runoff A guide to runoff estimation
2D Model Uses - Infrastructure
Australian Rainfall and Runoff A guide to runoff estimation
What is ARR used for? Protection
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Australian Rainfall and Runoff A guide to runoff estimation
2D Model Uses Protection
Australian Rainfall and Runoff A guide to runoff estimation
2D Model Uses Environmental Flows
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Australian Rainfall and Runoff A guide to runoff estimation
AIM
Aim Stage 1 of Project 15 was to consolidate existing knowledge and practice and to highlight deficiencies in the available information.
Stage 2: Testing of emerging areas or areas identified as requiring further research.
Australian Rainfall and Runoff A guide to runoff estimation
AIM
The Stage 1 deliverables defined by the funding agreement with DCC were:
15.1 Assessment of two dimensional models and appro aches for simulation of events in urban areas.
15.2 Development of a methodology for assessing th e performance of these models.
15.3 A report detailing the above work including a detailed scoping of future stages.
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Australian Rainfall and Runoff A guide to runoff estimation
AIM
The Stage 2 deliverables defined by the funding agreement with DCC were:
15.1 Production of a series of peer reviewed paper s that give clear recommendations on the knowledge gaps
15.2 Updating of the stage 1 report to incorporate this work.
Australian Rainfall and Runoff A guide to runoff estimation
APPROACH
Non traditional approach in order to bring together knowledge
series of workshops whose attendees included:
software suppliers experienced 2D model users, clients, and hydraulics experts.
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Australian Rainfall and Runoff A guide to runoff estimation
APPROACH Cont
Produce collaborative report
Initial Wiki approach
Chapter Authors assigned
Group review and technical writer
Australian Rainfall and Runoff A guide to runoff estimation
WORKSHOP TEAM
The Project 15 workshop members were (* indicate contributing authors to the Project 15 report):
Mark Babister (Project Manager) - WMAwater * James Ball (ARR Editor) UTS * Roger Austin Wallingford Cathie Barton * Warwick Bishop Water Technology * Ben Caddis - WBM Stephen Gray - WMAwater * Rhys Hardwick Jones - WMAwater * Martin Lambert Uni of Adelaide John Macintosh - Water Solutions Andrew McCowan Water Technology * Steve Muncaster Water Technology *
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Australian Rainfall and Runoff A guide to runoff estimation
John Murtagh NSW DECC * Bill Peirson UNSW (WRL) * Brett Phillips Cardno * Habib Rehmann - Golder Monique Retallick - WMAwater * Ted Rigby - Rienco Grantley Smith UNSW (WRL) * Bill Syme - WBM * Stefan Szylkarski - DHI * Chris Thomas Worley Parsons Rhys Thompson Cardno * Eric Valentine - CDU Rudie Van Drye Bill Weeks QLD Main Roads*
WORKSHOP TEAM
Australian Rainfall and Runoff A guide to runoff estimation
REPORT STRUCTURE
Chapter no. Chapter Title1 Introduction2 2D Conceptualisation3 Overview of Modelling approaches4 Modelling Process5 Data Requirements6 Model Schematising / Implementation / Assembly7 Calibration Process8 Interpretation of Results9 1D/2D models10 Current Issues with 2D modelling11 Direct Rainfall12 Recommendations and Conclusions
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Australian Rainfall and Runoff A guide to runoff estimation
REPORT STRUCTURE
Chapter no. Chapter Title10 Current Issues with 2D modelling
10.1 Supercritical flow10.2 Adaptive timesteps/run times10.3 Wetting/Drying10.4 Valid Parameter ranges/envelopes10.5 Eddy Viscosity10.6 Very shallow and very deep flow10.7 Numerical precision and accuracy issues10.8 Sub grid features10.9 Structures10.10 Features in urban environments10.11 Resistance/ roughness
Australian Rainfall and Runoff A guide to runoff estimation
DIRECT RAINFALL BACKGROUND
Relatively new approach
Removes need for hydrologic model
Very few published studies (Caddis et al 2008, Clark et al 2008)
No natural gauged catchments with LIDAR data were available until very recently
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Australian Rainfall and Runoff A guide to runoff estimation
RECOMMENDATIONS
Momentum transfer Interaction between flows in the main channel of rivers and on
floodplains and the incorporation of these effects in numerical models,
Connections between 1D and 2D models and momentum transfer,
Testing of commercial software to predict the velocity and hydraulic hazard distribution of a test channel compared to the theoretical distributions.
These models should be tested under the following conditions:
compound channels, meandering channels, and urban areas.
Australian Rainfall and Runoff A guide to runoff estimation
4/28/2010
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Australian Rainfall and Runoff A guide to runoff estimation
Australian Rainfall and Runoff A guide to runoff estimation
RECOMMENDATIONS
Obstructions
Buildings
flow obstructions or ineffective flow area,
increased roughness
temporary storage
Testing of modelling of small-scale features beyond the resolution of the model, particularly features likely to control flow behaviour
buildings,
fences, and
walls) .
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Australian Rainfall and Runoff A guide to runoff estimation
RECOMMENDATIONS
Test catchments
At the time of writing no catchment in Australia meets the intensive data requirements set out below for a suitable test data set: pluviograph records,
topographic data (channel cross sections, ALS data etc)
gauged catchment,
calibration data, and
information regarding roughness values.
Australian Rainfall and Runoff A guide to runoff estimation
ACKNOWLEDGEMENTS
Cardno
Charles Darwin University
Department of Environment and Climate Change NSW
Department of Main Roads QLD
DHI Water and Environment
Golder
Rienco
University of Adelaide
University of Technology Sydney
WBM
Wallingford
Water Solutions
Water Technology
WMAwater
Worley Parsons
WRL (UNSW)
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Australian Rainfall and Runoff A guide to runoff estimation
Thank YouThank Youandand
Questions ?Questions ?