Erosion control using of water hyacinth limited life geosynthetics (LLGs) with and without ruzi and vetiver grasses | |
| Author | Wah Wah Htwe |
| Call Number | AIT Thesis no.GE-11-02 |
| Subject(s) | Vetiver Soil erosion Water hyacinth |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Enginee ring in Geotechnical and Earth Resources Engineering Examination Committee: Prof. Dennes T. Bergado (Chairperson) Dr. Noppadol Phien - wej Dr. P ham .H uy .Giao Nationality: Myanmar Previous Degree: Bachelor of Science in Geology Taunggy i University Myanmar Scholarship Donor: Asian Institute of Technology Mac caf er r i Co. Ltd. Asian Institute of Technology School of En gineering and Technology Thailand May 2012 |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. GE-11-02 |
| Abstract | This research involved laboratory tests using water hyacinth limited life geotextiles (LLGs) as well as using vetiver and ruzi grasses for erosion control. In laboratory test, mass per unit area and tensile strength of water hyacinth LLGs were obtained. The tensile properties of ruzi and vetiver grass roots were obtained after growing periods of 2, 4, 5, 6 and 8 months. Moreover, rainfall effects were conducted in the laboratory for the erosion control tests model. Lateritic soil and sandy soil were used to study combining with LLGs and vegetation covers. Water hyacinth LLGs with opening size 8x8mm and 12x12mm was used to cover ba re soil. Ruzi and vetiver grasses were planted in the container and tested at the age of 4, 6, 8 weeks respectively. The model slope angle of 1:1, 2:1 and 3:1 were used for the test. The maximum rainfall intensity used in this study was 120mm/hr which norm ally occurs in Thailand. The runoff rate and soil loss were used to measure the soil erosion. The results shows that soil loss and runoff rate of lateritic soil were higher than sandy soil. Furthermore, the highest angles of slope 1:1 yielded highest runof f rate and soil loss than slope 2:1. Slope 3:1 with vegetation cover had the highest resistance to erosion. Generally, bare soil with LLGs 12x12 mm resulted in less amount of runoff rate than 8x8mm for both soil types. In contrast, bare soil with LLGs 12x1 2mm has observed higher soil loss than 8x8mm for both soil types. Additionally, comparing bare soil with ruzi grass reduced smaller amount of runoff rate and soil loss than vetiver grass. The combination of ruzi and vetiver grasses with lateritic soil can produce the best runoff rate and soil loss yield with slope 3:1. Slopes becomes steeper the surface runoff increased for steeper slopes. The increasing in growing periods at 4,6, 8 weeks of vetiver and ruzi grasses reduced the amount of soil loss and surfa ce runoff because of increasing coverage of vegetation. The observed data indicate the importance the role of vegetation in erosion prevention at different slope inclinations. The combination of vetiver and ruzi grass highly protected from soil erosion and runoff rate. |
| Year | 2012 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. GE-11-02 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Geotechnical Engineering (GE) |
| Chairperson(s) | Beregado, Dennes T.; |
| Examination Committee(s) | Noppadol Phien - wej;Giao, Pham Huy; |
| Scholarship Donor(s) | Asian Institute of Technology Maccaferri Co. Ltd.; |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 2011 |