| Author | Arellano, Esteban M. |
| Call Number | AIT Thesis no. 1054 |
| Subject(s) | Flood forecasting
|
| Note | A thesis submitted in partial fulfillment of the requirement for the degree of Master of Engineering of the Asian Institute of Technology, Bangkok, Thailand. |
| Publisher | Asian Institute of Technology |
| Abstract | The development of the Flood Forecasting Model is obtained through the serial connections of the node and Branch, Flood Plain, Grid, and Harmonic Models. Each model plays an important role in the operation of the Flood Forecasting Model on daily flood forecasting on water levels at predetermined gaging stations in the chao Phraya River. The Node and Branch Model describes the flood flow conditions for the river network from the tail of Chao Phraya
Darn to Bang Sai. The Flood Plain Models control the flow exchanges between the river channel and off stream flood plains through the uses of submerged or non-submerged weir equations . The Grid Model describes the flood flow conditions for the channel reach from Bang Sai down to the river mouth at Fort Chula near
the Gulf of Thailand. The Harmonic Model generates the predicted hourly sea level variations at Fort Chula through the method of harmonic analysis. The numerical solutions of the unsteady free surface continuity and momentum equations for the Node and Branch Model are obtained through the Gauss Seidel Technique of iteration. Solution of flood plain water level and volume is obtained through the storage routing equation and weir equations describing
the flow exchanges between the river and flood plains. Through the process of linearization by applying the finite difference approximations of the implicit
scheme, a system of finite difference continuity and momentum equations are
obtained for the Grid Model computation. In the Harmonic Model, the tidal variations at the river mouth are expressed as the summation of sine wave having
different phases, amplitudes, and periods for various predominating constituents.
Through appropriate calibration of the Flood Forecasting Model in the 1975 and 1970 flood flow data, the river channel and flood plain characteristics of the Node and Branch, Flood Plain and Grid Models are determined. The model is then used to perform flood forecasting operation for the various gaging stations
along the Chao Phraya River. The daily flood forecasting on water levels, for 5 days in advance, consisted of a back-up and forecasting computations. The results of the study signified a reliable performance of the model. |
| Year | 1978 |
| Type | Thesis |
| School | Student Research Before 1979 |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Thesis (Year <=1979) |
| Chairperson(s) | Arbhabhirama Anat
|
| Examination Committee(s) | Tawatchai Tingsanchali ; Selvalingam, Selvadore
|
| Scholarship Donor(s) | Netherlands |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1978 |