Erosionpresentationcompressed01 05-13

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The presentation from the Erosion and Sediment Control Demonstration Facility, Australia

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Erosionpresentationcompressed01 05-13

  1. 1. Shane Holborn Will Pearce Erosion and Sediment Control Demonstration Facility
  2. 2. Introduction Erosion & Sediment Control Demonstration Facility (TU10025) Funded by the turf levy through Horticulture Australia Ltd (HAL) Started under Queensland Government management at Redlands Research Station Transferred to BioScience Australia Pty Ltd as a result of DAFF disinvestment in turf Scheduled to run until February 2014 under this round of funding
  3. 3. Built a facility Run monthly demonstration workshops for: building, road construction and mining industries (practitioners); decision makers in local, state and federal government (specifiers); Partnering with training companies e.g. Absorb Enviro and Lend Lease. Erosion and Sediment Control Demonstration Facility
  4. 4. Meet with practitioners Identify barriers to use Address barriers with research and by working with industry and decision makers. Erosion and Sediment Control Demonstration Facility
  5. 5. Erosion and Sediment Control Demonstration Facility Extension of previous research with Dr Rob Loch - Optimising Turf Use to Minimise Soil Erosion on Construction Sites
  6. 6. Optimising Turf Use to Minimise Soil Erosion on Construction Sites Four main areas: Study of hydraulic roughness of different turf types; Measurement of sediment trapping; Assessment of potential tunnelling under turf strips of various ages; Assessment of rates of root development in turf and impact of season on initial root development.
  7. 7. Results Hydraulic roughness of different turf types? (Hydraulic roughness is the measure of the amount of frictional resistance water experiences when passing over land features). Showed increasing Manning’s n values as turf height increased (i.e. decreased velocity) Sediment trapping capacity? Turf was highly effective in trapping particles >0.05mm and able to cause some reduction in the 0.02 – 0.05mm range. Turf will trap sediment sizes capable of moving through some silt fences/barriers.
  8. 8. Results - Sediment trapping 0 2 4 6 8 1 0 1 2 1 4 T im e ( m in ) 0 2 4 6 8 1 0 TotalSediment(g/L) I n le t O u t le t
  9. 9. Tunnelling? • Tunnel erosion potential and undermining of turf was not present and was able to handle large flows within 8 days Root development differences and seasonal impacts? • Little observable difference between species in summer but green couch, kikuyu and to lesser extent blue couch, faster to establish in winter Results
  10. 10. 1. A role for turf to control erosion by firstly reducing detachment
  11. 11. Erosion control • turf on slopes up to 33% gradient; turfgrass seed could be promoted for steeper slopes. • in channels with flow velocities >1.5 m/s; Recommendations/specifications:
  12. 12. 2. And trapping sediment
  13. 13. Sediment control •turf can enhance or replace sediment fences; •preferred strip width of ≥2 m •varying species depending on season is an option.
  14. 14. Could be considered as an option
  15. 15. Could be better option - functionality
  16. 16. Could be better option – safety and aesthetics
  17. 17. Works well in conjunction with other measures
  18. 18. Erosion demonstration facility
  19. 19. •Six bays in total, bays are 3mx10m (30m2 ) •Water runs on sheet flow •2L /sec •8% slope •To the outfall trough •Water is timed running across the plot •Samples are collected at 1 min intervals •Turbidity measures taken to illustrate differences Erosion demonstration bays
  20. 20. Erosion channel (video then 10:45) •Demonstrate sediment movement and deposition in faster flows •90 meters long •500mm deep •10-15 L/sec •Snakes down the slope starting with a 1% slope along the top, coming round a bend at 3-4% slope and running down the hill at 8% toward the end
  21. 21. Information packs
  22. 22. Or search for Erosion and Sediment Control

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