VETIVER SYSTEM FOR BRIDGE APPROACH STABILISATION

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1 VETIVER SYSTEM FOR BRIDGE APPROACH STABILISATION Dr. Paul Truong - TVNI Technical Director, Brisbane, Australia. All materials in this document remain the property of TVNI. Permission must be obtained for their use. Copyright /11/17 THE VETIVER NETWORK INTERNATIONAL 1

2 Vetiver System. The Vetiver System (VS) is a new Bioengineering technology based on the use of vetiver grass ( Chysopogon zizanioides L.) in various applications VS has been developed in the last 20 years through extensive research, development and applications worldwide. VS has been used successfully for flood erosion control and riverbank stabilisation in Australia, Asia Africa and Latin America. The main advantages of VS are that it is effective, practical and a low cost method of flood erosion control and riverbank stabilisation. 12/11/17 THE VETIVER NETWORK INTERNATIONAL 2

3 Special Characteristics of Vetiver Grass The following characteristics make vetiver grass highly effective for flood erosion control and riverbank stabilisation: A deep, penetrating and extensive root system that binds the soil, and reinforces the soil structure which requires extraordinary force to dislodge. Erect and stiff stems forming a dense hedge which is very effective in retarding water flow and reducing the erosive power of the strong current. The top portion of the vetiver plant is flexible and bends over under strong flow. The bent tops act as an energy dissipater Vetiver is tolerant to drought, saline, sodic and acidic soil conditions. Vetiver survives under prolonged and complete submergence and it resumes growth after emerging from the water. Under partial submergence conditions, vetiver can remain indefinitely, as it was originally a wetland species. 12/11/17 THE VETIVER NETWORK INTERNATIONAL 3

4 Deep and Penetrating roots One year old plant with 3.3m deep root system in Thailand Submergence Tolerance Growing vigorously in water 12/11/17 THE VETIVER NETWORK INTERNATIONAL 4

5 Principles of the Vetiver System for River Bank Stabilisation In flood erosion control and riverbank stabilisation the VS uses the deep and high tensile root system to reinforce the bank slopes and its dense and stiff stems to spread and Reduce current flow velocity. To stabilise the bank steep gradients, horizontal rows planted on approximate contour lines To reduce flow velocity of the strong current thus preventing scouring from the strong flow; planting of cross rows is needed. For maximum effect, the cross rows are orientated at right angle to the flow direction. The spacing of both horizontal and cross rows varies with slope gradient and length, soil type, flow velocity and depth. 12/11/17 THE VETIVER NETWORK INTERNATIONAL 5

6 AUSTRALIAN APPLICATIONS The followings are projected carried out in tropical and subtropical Australia 12/11/17 THE VETIVER NETWORK INTERNATIONAL 6

7 12/11/17 THE VETIVER NETWORK INTERNATIONAL 7

8 Approach was washed out after road realignment 12/11/17 THE VETIVER NETWORK INTERNATIONAL 8

9 Severe erosion on the approach of the Coolumboola Creek bridge near Miles, Queensland.. 12/11/17 THE VETIVER NETWORK INTERNATIONAL 9

10 Erosion was caused by the change in flow direction Eroded area Flow 12/11/17 THE VETIVER NETWORK INTERNATIONAL 10

11 Vetiver was planted in contour rows to stabilise the batter and cross rows to reduce flow velocity 12/11/17 THE VETIVER NETWORK INTERNATIONAL 11

12 12/11/17 THE VETIVER NETWORK INTERNATIONAL 12

13 One month after planting 12/11/17 THE VETIVER NETWORK INTERNATIONAL 13

14 Six month after planting 12/11/17 THE VETIVER NETWORK INTERNATIONAL 14

15 18 months after planting (vetiver was frosted in winter but will resume growth in spring) 12/11/17 THE VETIVER NETWORK INTERNATIONAL 15

16 18 months after planting, note the bare area between rows 12/11/17 THE VETIVER NETWORK INTERNATIONAL 16

17 There were several big flows during the first summer and no damage occured. This approach is now well protected by the mature vetiver. 12/11/17 THE VETIVER NETWORK INTERNATIONAL 17

18 Five years after planting (Summer) 12/11/17 THE VETIVER NETWORK INTERNATIONAL 18

19 12/11/17 THE VETIVER NETWORK INTERNATIONAL 19

20 12/11/17 THE VETIVER NETWORK INTERNATIONAL 20

21 NEW GATTON BYPASS SANDY CREEK BRIDGE APPROACH (Under Old Bridge) 12/11/17 THE VETIVER NETWORK INTERNATIONAL 21

22 Flash flood undercut approach 12/11/17 THE VETIVER NETWORK INTERNATIONAL 22

23 Planting on 3 Dec /11/17 THE VETIVER NETWORK INTERNATIONAL 23

24 One month after planting 12/11/17 THE VETIVER NETWORK INTERNATIONAL 24

25 Seven weeks after planting, more than 30 cm growth 12/11/17 THE VETIVER NETWORK INTERNATIONAL 25

26 Three months after planting 12/11/17 THE VETIVER NETWORK INTERNATIONAL 26

27 One year after planting and through several flash floods 12/11/17 THE VETIVER NETWORK INTERNATIONAL 27

28 NEW GATTON BYPASS SANDY CREEK BRIDGE ABUTMENT (Under New Bridge) 12/11/17 THE VETIVER NETWORK INTERNATIONAL 28

29 Undercut shotcrete and unprotected batter 12/11/17 THE VETIVER NETWORK INTERNATIONAL 29

30 New approach under new bridge built parallel to the old bridge 12/11/17 THE VETIVER NETWORK INTERNATIONAL 30

31 Planting on 24 November /11/17 THE VETIVER NETWORK INTERNATIONAL 31

32 12/11/17 THE VETIVER NETWORK INTERNATIONAL 32

33 Four months after planting 12/11/17 THE VETIVER NETWORK INTERNATIONAL 33

34 Four months after planting 12/11/17 THE VETIVER NETWORK INTERNATIONAL 34

35 One year after planting 12/11/17 THE VETIVER NETWORK INTERNATIONAL 35

36 12/11/17 THE VETIVER NETWORK INTERNATIONAL 36

37 Bridge Abutment Coomera Creek, Brisbane Robina Rail line 12/11/17 THE VETIVER NETWORK INTERNATIONAL 37

38 Coomera Creek, Queensland Rail, Brisbane Robina line 12/11/17 THE VETIVER NETWORK INTERNATIONAL 38

39 Mangrove seedlings 12/11/17 THE VETIVER NETWORK INTERNATIONAL 39

40 Bridge abutment of a tidal creek 12/11/17 THE VETIVER NETWORK INTERNATIONAL 40

41 Bridge Approach ASSAM, INDIA By Shantanoo Bhattacharyya Executive Engineer, PWD, Assam TVNI Coordinator, Eastern India Vetiver Network 12/11/17 THE VETIVER NETWORK INTERNATIONAL 41

42 Doria bridge, Assam, India (2008) Doria Bridge approach, before and after vetiver planting, note grid pattern 12/11/17 THE VETIVER NETWORK INTERNATIONAL 42

43 Doria Bridge approach, six months after planting, note grid pattern 12/11/17 THE VETIVER NETWORK INTERNATIONAL 43

44 (2010) Doria Bridge approach, two years after planting 12/11/17 THE VETIVER NETWORK INTERNATIONAL 44

45 Doria Bridge approach, two years after planting (2010) 12/11/17 THE VETIVER NETWORK INTERNATIONAL 45

46 Doria Bridge approach, three years after planting (2011 ) Most of the approach was covered by native vegetation, Vetiver remained on the area where native species could not grow. 12/11/17 THE VETIVER NETWORK INTERNATIONAL 46

47 12/11/17 THE VETIVER NETWORK INTERNATIONAL 47

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