| Author | Supot Thammasittirong |
| Call Number | AIT Thesis no.WM-99-23 |
| Subject(s) | Flood forecasting--Chao Phraya River Basin
|
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of
Engineering. |
| Publisher | Asian Institute of Technology |
| Abstract | The River Network model, a combination of the River model and the Cell-Link model
is capable of simulating both high fluctuations flows in the rivers and slowly fluctuating flows
tluough the floodplains. The River Network Model is applied for forecasting daily maximum
water levels of 1980, 1983 and 1995 flood in the Chao Phraya Delta of Thailand for one
month in advance by input the forecasted upstream and downstream boundary conditions. The
upstream boundary is the released discharge at Chao Plu-aya Dam (Station C13) and the
downstream boundary is the tidal levels at Fort Chula (kml). At the upstream boundary, the
unique flood hydro graph was formulated and proposed. The empirical relationships of forecast
peak discharge, dimensionless shape of hydrograph and time base were derived using the
amount of combined upstream rainfall and released discharge from dams. Optimum length of
tidal record and number of tidal constituents were found to be 30 days with 4 constituents
which provide the least root meant square for tidal forecasting.
The model is re-calibrated with the 1995 flood based on the previous topographic data
in 1983, actual hydrologic conditions and actual spillage and gate operations in 1995.
Acceptable agreements between observed and simulated w~ter levels are obtained. Finally the
model has been used to study the effects of upstream and downstream boundary and the
amount of rainfall. It is found that the upstream boundary is significantly influence the
computed results at the river stations upstream of Angthong and the downstream boundary is
influence ones at the river stations downstream of Bang Sai. Both boundaries are slightly
influence the computed results in the floodplain stations. The amount of rainfall 1s an
important factor that effects the computed results only in floodplain stations. |
| Year | 2000 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Water Engineering and Management (WM) |
| Chairperson(s) | Sutat Weesakul;Pornsak Suppataratarn; |
| Examination Committee(s) | Suphat Vongvisessomjai;Tawatchai Tingsanchali |
| Scholarship Donor(s) | The German Academic Exchange Service
Deutscher Akademischer Austauschdienst (DAAD) |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2000 |