erosionpresentationcompressed01 05-13
TRANSCRIPT
![Page 1: Erosionpresentationcompressed01 05-13](https://reader036.vdocuments.us/reader036/viewer/2022062313/55b12b8abb61eb974c8b47f3/html5/thumbnails/1.jpg)
Shane Holborn
Will Pearce
Erosion and Sediment Control Demonstration Facility
![Page 2: Erosionpresentationcompressed01 05-13](https://reader036.vdocuments.us/reader036/viewer/2022062313/55b12b8abb61eb974c8b47f3/html5/thumbnails/2.jpg)
IntroductionErosion & 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
![Page 3: Erosionpresentationcompressed01 05-13](https://reader036.vdocuments.us/reader036/viewer/2022062313/55b12b8abb61eb974c8b47f3/html5/thumbnails/3.jpg)
Built a facilityRun 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
![Page 4: Erosionpresentationcompressed01 05-13](https://reader036.vdocuments.us/reader036/viewer/2022062313/55b12b8abb61eb974c8b47f3/html5/thumbnails/4.jpg)
Meet with practitionersIdentify barriers to useAddress barriers with research and by working with industry and decision
makers.
Erosion and Sediment Control Demonstration Facility
![Page 5: Erosionpresentationcompressed01 05-13](https://reader036.vdocuments.us/reader036/viewer/2022062313/55b12b8abb61eb974c8b47f3/html5/thumbnails/5.jpg)
Erosion and Sediment Control Demonstration Facility
Extension of previous research with Dr Rob Loch - Optimising Turf Use to Minimise Soil Erosion on Construction Sites
![Page 6: Erosionpresentationcompressed01 05-13](https://reader036.vdocuments.us/reader036/viewer/2022062313/55b12b8abb61eb974c8b47f3/html5/thumbnails/6.jpg)
Optimising Turf Use to Minimise Soil Erosion on Construction SitesFour 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.
![Page 7: Erosionpresentationcompressed01 05-13](https://reader036.vdocuments.us/reader036/viewer/2022062313/55b12b8abb61eb974c8b47f3/html5/thumbnails/7.jpg)
ResultsHydraulic 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.
![Page 8: Erosionpresentationcompressed01 05-13](https://reader036.vdocuments.us/reader036/viewer/2022062313/55b12b8abb61eb974c8b47f3/html5/thumbnails/8.jpg)
Results - Sediment trapping
0 2 4 6 8 10 12 14Tim e (m in)
0
2
4
6
8
10
Tot
al S
edim
ent (
g/L)
In le tO u tle t
![Page 9: Erosionpresentationcompressed01 05-13](https://reader036.vdocuments.us/reader036/viewer/2022062313/55b12b8abb61eb974c8b47f3/html5/thumbnails/9.jpg)
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
![Page 10: Erosionpresentationcompressed01 05-13](https://reader036.vdocuments.us/reader036/viewer/2022062313/55b12b8abb61eb974c8b47f3/html5/thumbnails/10.jpg)
1. A role for turf to control erosion by firstly reducing detachment
![Page 11: Erosionpresentationcompressed01 05-13](https://reader036.vdocuments.us/reader036/viewer/2022062313/55b12b8abb61eb974c8b47f3/html5/thumbnails/11.jpg)
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:
![Page 12: Erosionpresentationcompressed01 05-13](https://reader036.vdocuments.us/reader036/viewer/2022062313/55b12b8abb61eb974c8b47f3/html5/thumbnails/12.jpg)
2. And trapping sediment
![Page 13: Erosionpresentationcompressed01 05-13](https://reader036.vdocuments.us/reader036/viewer/2022062313/55b12b8abb61eb974c8b47f3/html5/thumbnails/13.jpg)
Sediment control•turf can enhance or replace sediment fences;
•preferred strip width of 2 m
•varying species depending on season is an option.
![Page 14: Erosionpresentationcompressed01 05-13](https://reader036.vdocuments.us/reader036/viewer/2022062313/55b12b8abb61eb974c8b47f3/html5/thumbnails/14.jpg)
![Page 15: Erosionpresentationcompressed01 05-13](https://reader036.vdocuments.us/reader036/viewer/2022062313/55b12b8abb61eb974c8b47f3/html5/thumbnails/15.jpg)
Could be considered as an option
![Page 16: Erosionpresentationcompressed01 05-13](https://reader036.vdocuments.us/reader036/viewer/2022062313/55b12b8abb61eb974c8b47f3/html5/thumbnails/16.jpg)
Could be better option - functionality
![Page 17: Erosionpresentationcompressed01 05-13](https://reader036.vdocuments.us/reader036/viewer/2022062313/55b12b8abb61eb974c8b47f3/html5/thumbnails/17.jpg)
Could be better option – safety and aesthetics
![Page 18: Erosionpresentationcompressed01 05-13](https://reader036.vdocuments.us/reader036/viewer/2022062313/55b12b8abb61eb974c8b47f3/html5/thumbnails/18.jpg)
Works well in conjunction with other measures
![Page 19: Erosionpresentationcompressed01 05-13](https://reader036.vdocuments.us/reader036/viewer/2022062313/55b12b8abb61eb974c8b47f3/html5/thumbnails/19.jpg)
Erosion demonstration facility
![Page 20: Erosionpresentationcompressed01 05-13](https://reader036.vdocuments.us/reader036/viewer/2022062313/55b12b8abb61eb974c8b47f3/html5/thumbnails/20.jpg)
•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
![Page 21: Erosionpresentationcompressed01 05-13](https://reader036.vdocuments.us/reader036/viewer/2022062313/55b12b8abb61eb974c8b47f3/html5/thumbnails/21.jpg)
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
![Page 22: Erosionpresentationcompressed01 05-13](https://reader036.vdocuments.us/reader036/viewer/2022062313/55b12b8abb61eb974c8b47f3/html5/thumbnails/22.jpg)
Information packs
![Page 23: Erosionpresentationcompressed01 05-13](https://reader036.vdocuments.us/reader036/viewer/2022062313/55b12b8abb61eb974c8b47f3/html5/thumbnails/23.jpg)
Or search for
Erosion and Sediment Control