Prediction of flash floods due to an assumed failure of Bhumibol Dam, North Thailand | |
| Author | Winai Sri-amporn |
| Call Number | AIT Thesis no. WA-89-26 |
| Subject(s) | Floods--Mathematical models Bhumipol Dam |
| 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 | Two mathematical models were used to simulate the propagation of dam-break flood wave due to an assumed failure of Bhumibol dam, North of Thailand . The first is a one - dimensional (1-D) model of the National Weather Service (NWS) Dam-Break Flood Forecasting Model (DAMBRK ) . It was applied to predict the propagation through the Ping river channel-valley downstream from the dam. The second model is a two-dimensional ( 2-D ) or the TESTPROG model developed by Wattanaprateep ( 1987 ) based on an explicit finite difference scheme. It was applied to simulate the spreading of flood water in the river and its flood plains immediately downstream of the dam. The dam is assumed to be totally failed within a very short time of 1/2 minute, with a trapezoidal breached shape. Th e results from the DAMBRK model are the water surface elevations and flood wave velocity profiles, the arrival time of wave front and the profiles of flood peak. Th e discharge and stage hydrographs at various stations along the river are also presented. The results from the TESTPROG model show the invasion of flood wave and velocity vectors at each grid in the flow region. Sensitivity analysis of both models were carried out. The effect of failure duration and Manning's n of the 1 - D DAMBRK model, and the Manning's n and correction coefficients in the momentum equations of the 2-D TESTPROG model are determined. It was found that for the 1-D model, within the range of the failure duration considered, the failure duration has not much effect on the breach outflow hydrograph. The Manning ' s n in the 1- D model has certain effects on the computed flow conditions. The correction coefficients in the 2-D model play an important role on the computed results , especially at the earlier rising stage of the water surface elevation. Besides, the correction coefficient in the trans verse direction to the flow has less effect than that of the correction coefficient in the main flow direction. The Manning roughness coefficients have certain significant effects on the propagation of flood wave in the 2- D model. |
| Year | 1989 |
| 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) | Tawatchai Tingsanchali |
| Examination Committee(s) | Akiyama, Juichiro ;Jensen, Niels Einar |
| Scholarship Donor(s) | The Government of Australia |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1989 |