| Author | Somchai Hittrawatna |
| Call Number | AIT Thesis no. 120 |
| Subject(s) | Channels (Hydraulic engineering)
|
| Note | A thesis submitted in partial fulfillment if the requirements for the degree of Master of Engineering in the SEATO Graduate School of Engineering, Bangkok, Thailand. |
| Publisher | Asian Institute of Technology |
| Abstract | An exploratory study of the effect of gradation on bed roughness was carried out using 3 different sets of bed gravels, which differed in the measure of gradation, but all having the same median diameter of 0.0509 ft (15.5 mm). The gravels were designed to have low, medium, and high gradation (1.060, 1.565 and 1.935) respectively. These gravels when used in the laboratory experiments were placed along the entire length of a tilting flume 40 ft. long. All of the experiments were conducted using only two depths of flow in the open channel, one depth was 0.485 "t .005 ft., and the other was 0.265 "t .005 ft. The shallow depth produced a higher resistance to flow than the deeper depth. All experiments were conducted in the subcritical flow region. The result of the study indicated that the measure of gradation has an effect on resistance factors. The higher gradation of bed gravels will produce higher resistance factors. An equation relating Manning's n as a function of d^ and the measure of gradation o' was also established. |
| Year | 1965 |
| Type | Thesis |
| School | Student Research Before 1979 |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Thesis (Year <=1979) |
| Chairperson(s) | Dr. Niwat Daranandana; |
| Examination Committee(s) | Dr. Norbert L. Ackermann;Dr. John A. Roberson;Dean Milton E. Bender, Jr. |
| Degree | Thesis (M.Eng.) - SEATO Graduate School of Engineering |