Flood control and drainage in the Lower Mae Klong river | |
| Author | Latif, Shahid |
| Call Number | AIT Thesis no.WM-98-11 |
| Subject(s) | Flood control--Thailand--Mae Klong River Drainage--Thailand--Mae Klong River |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering. School of Civil Engineering |
| Publisher | Asian Institute of Technology |
| Abstract | The Mikell Hydrodynamic Model is applied to simulate the flood conditions for the reach from Vajiralongkom Dam to River Mouth for the flood events already occured in 1982 and 1996. The Model is also applied to simulate the flows in the river for the year 1988. The Input data for the model at various streamflow gauging stations were collected from different organizations in Thailand e.g.,Royal Irrigation Department, Harbour Department and from the feasibility report titled as "Economic, Engineering and Environment for Development of Mae Klong and Tha Chin River for Export" prepared by a consortium of Panya Consultant Co. Ltd., ASPAC consultant Co. Ltd., Bangkok Engineering Services and Technology Engineering Co. Ltd., and Southeast Asia Technology Co. Limited. Flood Frequency Analysis is carried out by the Program Hydstat, which computes the probability distributions like Normal, Log-Normal, Gumbel, Log-Gumbel, Pearson III, Log-Pearson III, and Log-Normal III. Flood Frequency also carried out with plotting position. Weibull and Gringorten's plotting positions are also used for computation and data distribution on the probability paper for best fittings. The Program Hydstat also compute the Chi-square value. In the study, the Log-Normal Distribution that has the least one Chi-square value is adopted for prediction of unknown events for 25 year and 100 year return periods. The Mike 11 Hydrodynamic Model has been used for flood routing study in the main river and floodplains. The model solves the 1-D Continuity and Momentum Equations of flow using Implicit Finite Difference Scheme. In the model the water level in the river and floodplain is assumed equal and the floodplain is considered as a part of the river (Option FP3 of Mike 11 Model). The results of the calibration and verification of the model has been evaluated and found satisfactory. The calibrated roughness coefficient is found to be 0.025. The statistical analysis has been carried out which shows good agreement between the observed and computed data. Sensitivity analysis has also been carried out by varying the value of Manning's Roughness coefficient as± 20 %, which shows good results. Flood simulation was carried out for designed floods 25 and 100 year return periods. The effects of water levels with and without flood control schemes were determined. For the flood control scheme of diking, the water level rises after the construction of dikes on both sides of the river but with dredging of the river the water level lowered as compared without scheme. The cost estimate was made for both schemes and found that the cost of diking is economical as compared with dredging.based on unit cost. Dredging also required 111 maintenance of channel depth and banks stability, which reqmres additional budget. Therefore raising of the existing flood protection dikes is recommended for the study reach. |
| Year | 1999 |
| Type | Thesis |
| School | School of Engineering and Technology |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Water Engineering and Management (WM) |
| Chairperson(s) | Tawatchai Tingsanchali ; |
| Examination Committee(s) | Suphat Vongvisessomjai ;Kazama, So; |
| Scholarship Donor(s) | Government of Japan; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology |