Flushing of canals in Klong San, west of Bangkok | |
| Author | Ranasinghe, Arachchi Appuhamilage Daya Kanthi |
| Call Number | AIT Thesis no.WM-98-19 |
| Subject(s) | Water quality management--Thailand--Bangkok Canals--Thailand--Bangkok |
| 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 | Water in klongs in Bangkok area is severely polluted in dry season. Some klongs produce good environment for growth of diseases and make obnoxious order. This situation creates many problems to the public and destroys ecology system of the surrounding. The pollution level of klongs can be controlled by increasing the flushing efficiency of klong water. The efficiency of flushing klong water can be increased using the tidal water level variation of Chao Phraya River in dry season. A no of projects have been done for different part of Bangkok Klong network in past decade to improve klong water quality. This study was done for the klong network in K San and Thonburi districts. A finite difference implicit scheme was used in the developing of the mathematical model to simulate the field conditions and describe the characteristics of the flow and transport in klongs. The model output was used to find out a suitable alternative to solve the present problem. In this study water quality-controlling parameters was BOD. The calibrated diffusion coefficient was 10m2 /s. In low tide period, upstream gates are closed and polluted water is drained out through downstream gates. Due to the lack of dilution water, the pollution levels of klongs are increased in this period. Results of the study proved that the existing pumping facility in the upstream of the study area does not sufficient to control this situation. In the study, it was found that the range of BOD could be reduced from 13-38 mg/l to 10.5-23 mg/l using a 2m3 /s capacity pump in low tide period at an upstream station, K Wat Anong. In the case of flushing using pure water, maximum BOD can then be reduced byl2%. |
| Year | 1999 |
| Type | Thesis |
| School | School of Environment, Resources, and Development |
| Department | Department of Energy and Climate Change (Former title: Department of Energy, Environment, and Climate Change (DEECC)) |
| Academic Program/FoS | Water Engineering and Management (WM) |
| Chairperson(s) | Sutat Weesakul ; |
| Examination Committee(s) | Suphat Vongvisessomjai ;Tawatchai Tingsanchali; |
| Scholarship Donor(s) | Asian Institute of Technology; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1999 |