Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.

Assessment of Swan and Canning River Tidal and Storm Surge Water Levels - Alan Forster (URS)

2,274 views

Published on

Assessment of Swan and Canning River Tidal and Storm Surge Water Levels - Alan Forster (URS).

Presented at the 2014 MIKE by DHI UK Symposium on 13th to 14th May 2014.

Published in: Engineering, Technology, Business
  • Be the first to comment

Assessment of Swan and Canning River Tidal and Storm Surge Water Levels - Alan Forster (URS)

  1. 1. Presentation Title Assessment of Swan and Canning River Tidal and Storm Surge Water Levels 13 May 2014 Acknowledgements Australian Government Funding Commonwealth: Natural Disaster Resilience Program State: Department of Water Data Sources WA Department of Transport: Coastal Data Centre WA Department of Water URS Perth Hydraulic Modelling Team
  2. 2. Swan and Canning Rivers Tidal and Storm Surge Water Levels 2 Outline 1. Objective 2. Background 3. The Solution 4. Results 5. Challenges
  3. 3. Swan and Canning Rivers Tidal and Storm Surge Water Levels 3 1. Objective •Provide quantitative information that the Department of Water could use to provide planning policy advice with respect to future flood levels in the Swan and Canning River System. •Achieved through a strategic level study of the Swan and Canning Rivers to understand the role of: -River flows -Marine surges -Wind and -Sea level rise -On the water level in the river system
  4. 4. Swan and Canning Rivers Tidal and Storm Surge Water Levels 4 2. Background: Location Darlingscarp‘Thehills’ Fremantle Swan River Canning River Perth CBD
  5. 5. Swan and Canning Rivers Tidal and Storm Surge Water Levels 5 2. Background: Location Mill Point 1926
  6. 6. Swan and Canning Rivers Tidal and Storm Surge Water Levels 6 2. Background: Location
  7. 7. Swan and Canning Rivers Tidal and Storm Surge Water Levels 7 2. Background: Location
  8. 8. Swan and Canning Rivers Tidal and Storm Surge Water Levels 2. Background: Location 8 Photographs from Brearly, 2005, “Ernest Hodgkin’s Swanland: Estuaries and Lagoons of South-western Australia”, UWA Press.
  9. 9. Swan and Canning Rivers Tidal and Storm Surge Water Levels 9 2. Background: Water Level Forcing Meadow Street Existing tidal limit
  10. 10. Swan and Canning Rivers Tidal and Storm Surge Water Levels 3. The Solution: MIKE21HD(FM) 10 MeadowStreet BarrackStreet Fremantle
  11. 11. Swan and Canning Rivers Tidal and Storm Surge Water Levels 3. The Solution: MIKE 21HD (FM) 11 Meadow Street Barrack Street Fremantle
  12. 12. Swan and Canning Rivers Tidal and Storm Surge Water Levels 12 3. The Solution: MIKE21 SW and Overtopping Analysis
  13. 13. Swan and Canning Rivers Tidal and Storm Surge Water Levels 3. The Solution: MIKE21 SW and Overtopping Analysis 13 (72 km/hr)
  14. 14. Swan and Canning Rivers Tidal and Storm Surge Water Levels 4. Results: Flood Maps 14
  15. 15. Swan and Canning Rivers Tidal and Storm Surge Water Levels 4. Results: Maximum Speed 15
  16. 16. Swan and Canning Rivers Tidal and Storm Surge Water Levels 4. Results: Long Sections 16
  17. 17. Swan and Canning Rivers Tidal and Storm Surge Water Levels 17 4. Results: Wave overtopping Overtopping Rates (litres / sec / m)
  18. 18. Swan and Canning Rivers Tidal and Storm Surge Water Levels 5. Challenges: Client’s Brief and Expectations •Client requested - Wave setup •Client Assembled ‘all’ input data - Water level and flow (hydrology) data - Bathymetry data • LiDAR • Bathymetric surveys • River cross-sections (1980’s) - No allowance for additional survey works - Aerial photographs 18
  19. 19. Swan and Canning Rivers Tidal and Storm Surge Water Levels 5. Challenges: Bathymetry •Highly vegetated river valleys with no cross-section or reliable LiDAR data •Very shallow (<0.2m) difficult to distinguish a ‘main’ channel 19
  20. 20. Swan and Canning Rivers Tidal and Storm Surge Water Levels 5. Challenges: Hydrology 21
  21. 21. Swan and Canning Rivers Tidal and Storm Surge Water Levels 5. Challenges: Calibration 22
  22. 22. Swan and Canning Rivers Tidal and Storm Surge Water Levels 5. Challenges: Calibration 23
  23. 23. Swan and Canning Rivers Tidal and Storm Surge Water Levels 5. Challenges: Development •Attempt 1: MIKE Flood - Coupled model u/s of Meadow Street/MIKE21HD d/s - Calibrated for all but high fluvial flow - Unstable along coupling for rising flows •Attempt 2: MIKE11 linked to MIKE21 HD(FM) - Very poor calibration at Meadow Street for high fluvial flow - Unsure if the model would reproduce tidal limit for sea level rise scenarios •Attempt 3: MIKE 21 HD (FM) - Model A: Quadrangular mesh for channel - Model B: Triangular mesh for channel • Stable throughout model • Best overall calibration 24
  24. 24. Swan and Canning Rivers Tidal and Storm Surge Water Levels 6. Conclusion •Project was a success for the DoW •MIKE21HD (FM) model delivered to the DoW •Issues with bathymetry highlighted and overcome •Established hydrology challenged and up for review •Identified: - River flooding the largest risk but - Sea level rise will have significant impact on long- term development 25
  25. 25. Swan and Canning Rivers Tidal and Storm Surge Water Levels Questions? 26

×