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Water Wednesday 2009 July George Ganf
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Water Wednesday 2009 July George Ganf

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George Ganf at Water Wednesday

George Ganf at Water Wednesday

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  • 1. Water Research Centre Water Wednesday Sustaining the River Murray with less water
  • 2. Water Allocation to Murray Valley wetlands: a basin wide modelling approach George Ganf, University of Adelaide Rod Oliver, CSIRO Sean White, University of Adelaide Justin Brookes, Kane Aldridge, Dominic Skinner, Mike Young Supported by Land & Water Australia (sadly, no more)
  • 3. Wetland Plants
  • 4. 7000+ wetlands
  • 5. Fro this m To this
  • 6. Summary of major findings • Connectivity • Linking aquatic vegetation with hydrology Pre- v. post-regulation •Resilience •Fragmentation The ecological unit •Management for ecological benefit •The reach •Weir pool manipulation (Chowilla initiative)
  • 7. Connectivity – a surrogate index of water regime • 0.91- 1.0 = continuous connection to main channel (permanently wet) • 0.41- 0.5 = 41 - 50% of time connected to main channel (seasonal inundation) • 0.0- 0.09 = Never or rarely connected
  • 8. CONNECTIVITY
  • 9. P - v. p s g tio > 10 0w tla s re o t-re ula n 0 e nd lo t c nne tio w m in c nne s o c n ith a ha l
  • 10. Gaussian distribution curves describing probability of presence for 4 species across a gradient in wetland-river connectivity. 1.0 Eleocharis acuta Potamogeton crispus Phyla canescens 0.8 Phragmites australis Probability of presence 0.6 0.4 0.2 0.0 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 Connectivity
  • 11. Pre- v. post regulation – influence of discharge above nominal (1989-2000) on # wetlands that achieve maximum diversity 60000 3000 50000 2500 Cumulative area of wetlands (ha) Cumulative number of wetlands 40000 2000 30000 1500 20000 1000 Nominal 10000 Discharge 500 0 0 -10000 -8000 -6000 -4000 -2000 0 2000 -1 Discharge (GL yr )
  • 12. Pre- v. post regulation – influence of discharge above nominal (1989-2000) on # wetlands that achieve maximum diversity 60000 3000 50000 2500 Cumulative area of wetlands (ha) Cumulative number of wetlands 40000 2000 30000 Post 1500 20000 1000 Nominal 10000 Discharge 500 0 0 -10000 -8000 -6000 -4000 -2000 0 2000 -1 Discharge (GL yr )
  • 13. Pre- v. post regulation – influence of discharge above nominal (1989-2000) on # wetlands that achieve maximum diversity 60000 3000 50000 2500 Cumulative area of wetlands (ha) Cumulative number of wetlands 40000 2000 30000 Post 1500 20000 1000 Nominal 10000 Discharge 500 0 0 -10000 -8000 -6000 -4000 -2000 0 2000 -1 Discharge (GL yr )
  • 14. Pre- v. post regulation – influence of discharge above nominal (1989-2000) on # wetlands that achieve maximum diversity 60000 3000 50000 2500 Cumulative area of wetlands (ha) Cumulative number of wetlands 40000 2000 30000 Post 1500 20000 1000 Nominal 10000 Discharge 500 0 0 -10000 -8000 -6000 -4000 -2000 0 2000 -1 Discharge (GL yr )
  • 15. Pre- v. post regulation – influence of discharge above nominal (1989-2000) on # wetlands that achieve maximum diversity 60000 3000 Pre- 50000 2500 Cumulative area of wetlands (ha) Cumulative number of wetlands 40000 2000 30000 Post 1500 20000 1000 Nominal 10000 Discharge 500 0 0 -10000 -8000 -6000 -4000 -2000 0 2000 -1 Discharge (GL yr )
  • 16. Pre- v. post regulation – influence of discharge above nominal (1989-2000) on # wetlands that achieve maximum diversity 60000 3000 Pre- 50000 2500 Cumulative area of wetlands (ha) Cumulative number of wetlands 40000 2000 30000 Post 1500 20000 1000 Nominal 10000 Discharge 500 0 0 -10000 -8000 -6000 -4000 -2000 0 2000 -1 Discharge (GL yr )
  • 17. Pre- v. post regulation – influence of discharge above nominal (1989-2000) on # wetlands that achieve maximum diversity 60000 3000 Pre- 50000 2500 Cumulative area of wetlands (ha) Cumulative number of wetlands 40000 2000 30000 Post 1500 20000 1000 Nominal 10000 Discharge 500 0 0 -10000 -8000 -6000 -4000 -2000 0 2000 -1 Discharge (GL yr )
  • 18. Pre- v. post regulation – influence of discharge above nominal (1989-2000) on # wetlands that achieve maximum diversity 60000 3000 Pre- 50000 2500 Cumulative area of wetlands (ha) Cumulative number of wetlands 40000 2000 RESILIENCE 30000 20000 Post 1500 1000 Nominal 10000 Discharge 500 0 0 -10000 -8000 -6000 -4000 -2000 0 2000 -1 Discharge (GL yr )
  • 19. -10000 -8000 -6000 -4000 -2000 0 2000 -6000 -5000 Discharge (GL yr-1) 60000 3000 60000 B E Cumulative number of wetlands Cumulative wetland area (ha) Cumulative wetland area (ha) 50000 2500 50000 Natural 40000 2000 40000 Family 30000 1500 30000 20000 Current 1000 20000 10000 500 10000 0 0 0 -20000 -15000 -10000 -5000 0 -4000 -300 Discharge (GL yr-1) Nominal Discharge 60000 3000 60000 C F Cumulative number of wetlands Cumulative wetland area (ha) Cumulative wetland area (ha) 50000 2500 50000 Natural Functional 40000 2000 40000 30000 1500 30000 20000 1000 20000 10000 Current 500 10000 0 0 0 -20000 -15000 -10000 -5000 0 -1000 Discharge (GL yr-1) Nominal Discharge
  • 20. Pre-regulation - Strong concordance – suggested that response of one indicator is associated with other indicators across all reaches Post-regulation – Not significant Suggests river regulation and extraction has segmented the river into discrete units whose wetland indices respond discordantly to changes in discharge and therefore must be managed individually
  • 21. Pre-regulation - Strong concordance – suggested that response of one indicator is associated with other indicators across all reaches FRAGMENTATION Post-regulation – Not significant Suggests river regulation and extraction has segmented the river into discrete units whose wetland indices respond discordantly to changes in discharge and therefore must be managed individually
  • 22. Artificial watering (pumping) V. Weir pool manipulation sustaining the resilience of aquatic communities and at the ecosystem level
  • 23. Inund tio a ao theC w a n re f ho illa flo d la a lo flo s(10 0 ML/d y o p in t w w ,0 0 a flo toSA), w a w ut a w ith nd itho n enviro e l re ula r o e tingo nm nta g to p ra n lo e C w C e (SA MDB NRM w r ho illa re k Bo rd 2 0 ). a 08