Advanced Bathing Water Forecasting - Aarhus Water Case Story Integrated, real-time control and warning for urban areas and receiving waters - multiple benefits from improved bathing water quality to effective flood risk management (incl. integration of numerical models, rainfall radar, automated operation of control structures, etc) - see also http://dhiuk-demos.blogspot.co.uk/2014/04/the-aarhus-project-aarhus-vand-under.html

1. Advanced Bathing Water Forecasting – Aarhus Water Case Story
Nick Elderfield
Managing DirectorDHI Water Environments

2. Integratedreal-time control and warning for urban areas and receiving waters
© DHI #2

3. © DHI
Aarhus –Denmark
… Second largest city in Denmark
… European Cultural Capital 2017 - RETHINK Aarhus
…Located by the Sea
…310,000 inhabitants
#3
©Sculpturesbythesea
©visitaarhus

4. © DHI
Aarhus –Danish for Progress
… Architecture and art
… Business and industries
…Aarhus University
…Recreational and active use of the environment
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5. Project domain
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6. Motivation
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7. © DHI
Project drivers
…Integrating water into the urban space
… Recreationaluse of water
…New housing area on the harbor front
…Rapid city development
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©Politiken
©Aarhus.dk

8. A forward looking project made in co-operation
between Aarhus Municipality
and Aarhus Water
From overall vision for the future
to concrete plan of actions.
Water Vision 2100
”Pure water both in nature
and for drinking
– now and in the future 2100
© Aarhus Water
© DHI 8

9. © DHI
Expected project outcome
…Improved water quality/partly bathing water in River Aarhus
… Bathing water in the Harbour(hygienic)
…Bathing water in Lake Brabrand(hygienic)
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© Aarhus Water
© Aarhus Water
© Aarhus Water

10. From vision to operation
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11. © DHI
3 projects -1 solution
…Implementation of infrastructure 2007-2012
…Integrated model based control and warning
PREPARED
2009-2013
…Analysis and design
2006-2007
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12. Boundary conditions
© DHI
River through the city
Recipient for urban water
Water level affects CSO
Water level in harbour
Defines river gradient
Rising sea levels?
Good water quality
-Harbourbath
-Housing on the harbour
Increased flooding frequency
Outflow depended on the sea level
Increased rural run-off due climate changes
AIM: To forecast the water quality in the harbour
Optimize the capacity of the drainage system and the WWTP’s
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13. Domain of real time system control
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A
B
C
Return period
Rainfallintensity
Light rainreturnperiod< 1 year
Design rainreturnperiod2-10 year
Extreme rainreturnperiod> 100 year
Adaptedfrom: Fratiniet al. (2012)

14. Challenge –Recreational water is receiving water
© DHI
3 wastewater treatment plants
75 combined sewer overflows (CSO)
58 storm water drains
50% of the flow in the river is from WWTPs
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15. Finding the right solution
© DHI
•Multiple scenario analysis based on integrated modelling
−Retention basin volumes
−System layout
−WWTP capacity
−Storm water system upgrade
−Removal of CSO structures
−Disinfection of WWTP effluent
−Climate scenarios
Mike Urban Model #15

16. Identified challenges
•Sufficient storage tank volume
−cost/space limitations in old city center
•Sufficient water quality
−bathing water quality in Lake BrabrandThe Harbourof Aarhus and partly in the River of Aarhus
•Climate change
−rain intensity and sea level rise
© DHI #16
© PREPARED
© PREPARED
© PREPARED

17. Solution -50 mill. EUR project 2009-2013
•Infrastructure investment
−9 retention basins
−Disinfection at WWTPs and basin
−Increased hydraulic capacity at WWTPs
•Optimized control System
−Integrated real time modelling/control (sewer system/WWTP)
−Early Warning System
© DHI #17

18. Integrated Real Time Control System
© DHI
SCADA
Models
Rainfall forecast
•Automated operation of:
−Data collection
−Data processing
−Model execution
−Findingthe optimal solution
−Control of structures
−Issuewarnings
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19. Integrated real-time control
© DHI
Sewer
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20. DHI Local Area Weather Radar (LAWR)
•Small scale weather radar
−X-band radar
•Range
•60 km for forecast
•20 km for Quantitative Est.
•Spatial resolution (Cartesian)
•500x500, 250x250, 100x100 m
•Image frequency
•1 or 5 minute
LAWR installation in Aarhus Denmark.
© DHI #20

21. © DHI
MIKE 11
MIKE URBAN
MIKE 3
MIKE SHE
Data flow Model preparation
Model execution
Real time control
Issues of warning
DIMS.CORE
Distributed rainfallfrom DHI Radar
Automated Integrated Modelling

22. DHI bathing water forecast service
© DHI #22
Live data from CSO’s and river model for forecasting
Deterministic coastal models of fate of pollutants
Live warning and information dissemination

23. •App and web based public warning system
Public information on bathing water quality
© DHI #23

24. Internet
24
EnvironmentalSection
Aarhus Municipality
Aarhus Water
Utility company
Waterforecast
Operated by DHI
One realtimesystem - Integrating data from multiple organizations and authorities
© DHI

25. Status
© DHI #25

26. © DHI
Project Status
…Improved water quality in River Aarhus
… Bathing water in the Harbour(hygienic)
…Bathing water in Lake Brabrand(hygienic)
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

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© Stiften
©Politiken
© Stiften

27. Saving in investment
© DHI
•Ordinary and larger retention basins79 million EUR
•Controllable and smaller retention basins45,6 million EUR
•Automation and control system1,7 million EUR
•Total47,3 million EUR
•Saving32 million EUR
40 %
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28. Our world is
water
© DHI
Introducing DHI
The expert in WATER ENVIRONMENTS
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29. © DHI
Our areas of expertise
to help solve the world’s toughest challenges in water environments
Aqua- & agriculture Marine structure & energy Climate change
Coast & marine Surface & ground water Urban water
Industry Environment & ecosystems Product safety & environmental risks
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30. Who we are…and why we can claim to bethe expert in water environments
© DHI #30

31. Our people advance our knowledge and deliver it worldwide
Highly qualifiedEqual employment
1100+ staff
120 man years R&D
Representing 56 nationalitiesGlobal knowledge sharing & staff mobility
© DHI #31

32. What we know
Global knowledge of water environments

33. At our Core
Making this knowledge accessible

34. For more details
Nick Elderfield, DHI Water Environments UK Ltd
nje@dhigroup.com
© DHI #34