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Advanced Bathing Water Forecasting - Aarhus Water Case Story

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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

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Advanced Bathing Water Forecasting - Aarhus Water Case Story

  1. 1. Advanced Bathing Water Forecasting – Aarhus Water Case Story Nick Elderfield Managing DirectorDHI Water Environments
  2. 2. Integratedreal-time control and warning for urban areas and receiving waters © DHI #2
  3. 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. 4. © DHI Aarhus –Danish for Progress … Architecture and art … Business and industries …Aarhus University …Recreational and active use of the environment #4
  5. 5. Project domain © DHI #5
  6. 6. Motivation © DHI #6
  7. 7. © DHI Project drivers …Integrating water into the urban space … Recreationaluse of water …New housing area on the harbor front …Rapid city development #7 ©Politiken ©Aarhus.dk
  8. 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. 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) #9 © Aarhus Water © Aarhus Water © Aarhus Water
  10. 10. From vision to operation © DHI #10
  11. 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 #11
  12. 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 #12
  13. 13. Domain of real time system control © DHI #13 A B C Return period Rainfallintensity Light rainreturnperiod< 1 year Design rainreturnperiod2-10 year Extreme rainreturnperiod> 100 year Adaptedfrom: Fratiniet al. (2012)
  14. 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 #14
  15. 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. 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. 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. 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 #18
  19. 19. Integrated real-time control © DHI Sewer #19
  20. 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. 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. 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. 23. •App and web based public warning system Public information on bathing water quality © DHI #23
  24. 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. 25. Status © DHI #25
  26. 26. © DHI Project Status …Improved water quality in River Aarhus … Bathing water in the Harbour(hygienic) …Bathing water in Lake Brabrand(hygienic)    #26 © Stiften ©Politiken © Stiften
  27. 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 % #27
  28. 28. Our world is water © DHI Introducing DHI The expert in WATER ENVIRONMENTS #28
  29. 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 #29
  30. 30. Who we are…and why we can claim to bethe expert in water environments © DHI #30
  31. 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. 32. What we know Global knowledge of water environments
  33. 33. At our Core Making this knowledge accessible
  34. 34. For more details Nick Elderfield, DHI Water Environments UK Ltd nje@dhigroup.com © DHI #34

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