| Author | Padoong Torranin |
| Call Number | AIT Thesis no.247 |
| Subject(s) | Hydraulics--Mathematical models
Chao Phraya River
|
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering of the Asian Institute of Technology,
Bangkok, Thailand |
| Publisher | Asian Institute of Technology |
| Abstract | Owing to the ocean tide, the flow in the lower part of the Chao Phraya River becomes unsteady and is governed by the unsteady free surface flow equations rather than the simple Manning’s formula. The governing equations were solved numerically by IBM 1130 digital computer using the finite differences method of implicit scheme. By linearizing the non-linear terms in the equations the computer program became straightforward. The computer programs solved for the
unknown discharges and stages at points along the river on the advance time line with the known values at the points on the present time line by starting with initial stages and discharges and using successive
values of stages from the recorded stage hydrographs at the upstream and downstream points of the reach as boundary values. The initial conditions which are usually not available were found not to have much effect on the computed result provided that the computation was started at some time before the consideration time for the purpose of the convergence of the computed result. The computation parameter which had the most significant effect
on the computed result was the flow resistance coefficient, n.
Since it was found that the variation of Ax and At did not,
practically, affect the computed result, therefore large values of At, 60 min ,were used, thus making for reduction of the computer time involved.
Good agreement between the computed and measured discharge hydrographs were obtained for wide range of discharges and for long reach of the River. Hence the tidal mathematical model of the Chao Phraya River from the mouth of the River, km 1, up to Bang Sai, km 112, had already
been represented. |
| Year | 1969 |
| Type | Thesis |
| School | Student Research Before 1980 |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Thesis (Year <=1979) |
| Chairperson(s) | Subin Pinkayan |
| Examination Committee(s) | Pichai Boonyakanjana ; Schulz, Edmund F. ; |
| Scholarship Donor(s) | Asian Institute of Technology |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 1969 |
