Interaction of tide and river flow | |
| Author | Tran van Phuc |
| Call Number | AIT Thesis no.WA-85-54 |
| Subject(s) | Tides--Chao Phraya River Hydraulics |
| 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 | A tide in a river is composed of various constituents which interact simultaneously with river flow. As a result of this interaction, the records of water level along the river are contributed to by various components of tide which are complicated and can not be predicted at present. It is the objective of this study to quantify the interaction between tides and river flows, therefore, the interaction of each constituent is investigated. Interaction of tides and river flows is the lower reach of the Chao Phraya River is investigated using i) Method of harmonic analysis, II0 Analytical solutions and iii) Finite difference model. These methods are used with the aim that the interaction of tides and river flows in the reach under consideration can be evaluated quantitatively. The harmonic analysis is first applied to the tidal records in 1980 and 1983 at five tidal stations along the river. Emphasis is made of four main constituents, M2, S2, K1 and O1. The results from harmonic analysis are used to fit existing analytical solutions for interaction of wave and current. The numerical computation is finally applied to confirm the results of analysis. In this study, it is found that the interaction of each constituent of tide with river flows can be established by which the overall interaction of various constituents of tide is quantified. In the dry season, each constituent of tides is conserved and slowly attenuated when propagating upstream. The amplitude and propagation velocity of tidal components are larger than that in flood season. In the spate period, the amplitude of each tidal component is quickly reduced, but a slight variation still observed at the upper-most stations. The diurnal tides are attenuated slower than the semi-diurnal tides; the former progressed up-stream less rapidly than the latter. A relationship between tidal wave attenuation modulus and river discharges is presented. |
| Year | 1985 |
| 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) | Suphat Vongvisessomjai |
| Examination Committee(s) | Tawatchai Tingsanchali ;Gupta, Ashim Das |
| Scholarship Donor(s) | The Government of France |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1985 |