| Author | Satriyo Untung |
| Call Number | AIT Thesis no.WA-90-30 |
| Subject(s) | Irrigation--Pakistan
|
| Note |
A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Abstract | Two concepts of design of stable alluvial channels of trapezoidal cross section have been studied. The first concept is the static stable channels deign concept in which the bed and bank material are considered to remain motionless. The second one is the dynamic stable channel design concept in which the bed and bank materials are considered in motion, in such a way that sediment load entered to the channel is sufficient to balance the scour due to the bed movement.
Methods used in the static stable channel design concept are the maximum permissible velocity method and tractive force theory (allowable bed shear stress method). The maximum permissible velocity is determined by using method of Fortier-Scobey (1926), USDA (1977), Kennedy and German Industry Standard (DIN 19661). The allowable tractive stress is determined by using the methods developed by USDA (1977), Simons and Albertson, USSR and Straub. Methods applied in the dynamic stable channels design concept are the modified regime approach of USDA (1977), Chang method (1980) and Abou Seida method (1987)
The irrigation canals considered in the static stable channel design are of the Phitsanulok Irrigation Project (Thailand), Jatiluhur Irrigation Project (Indonesia) and Chatra Irrigation Project (Nepal), while that considered in the dynamic stable channel design (Chang and Abou Seida methods) is the Chatra Irrigation Project.
The use of maximum permissible velocity method and Manning formula with a realistic value of "n", in the design of canal with a cohesive boundary gives an good agreement of the canal dimensions and bed slope compared to the constructed stable channels. The design result using the original Abou Seida method and Chang method, shows a considerable difference in canal dimensions and bed slope compared with that of the constructed stable channels. When the Engelund-Hansen bed material load formula is introduced into the Abou Seida method and Chang method, both methods give an better agreement to the constructed stable channels. Sensitivity analysis shows that the selected sediment transport formula, the bed slope and the mean size diameter of bed material in the dynamic stable channel design have a significant effect on the computed dimensions and bed slope of the canal. |
| Year | 1990 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Water Resources Research Engineering (WA) |
| Chairperson(s) | Paudyal, Guna N.; |
| Examination Committee(s) | Nielsen, Jens Moller ;Loof, Rainer |
| Scholarship Donor(s) | Canadian International Development Agency; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1990 |