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Water quality modelling of Klong Prapa | |
Author | Soe Min |
Call Number | AIT Thesis no.EV-01-18 |
Subject(s) | Water quality management--Mathematical models |
Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Environment, Resources and Developments |
Publisher | Asian Institute of Technology |
Abstract | The Klong (canal) Prapa is to be improved and protected from pollutant intrusions caused by increasing population density and heavy traffic condition of Bangkok Metropolitan. As per the plan of Highway Department, about 42% of the total canal length located at downstream end, carrying 15-17% of the total flow, is to be covered by concrete structure. Impacts on the quality of water conveyed under pipe flow condition, needs to be predicted before the new structure is placed. The major concerns are: the low flow velocity, long conveyance time, lack of reaeration, and presence of oxygen depleting processes. In this study, water quality of the canal, after improvement of the systems, is predicted by simulating a water quality model by Mike 11 modeling software. In this study, a water quality model with existing condition is developed and calibrated with the data obtained from field samplings, on site tests, and laboratory works. Calibrated parameters and coefficients are then applied to the model, and simulated with the future conditions - covering structure and improved channel sections. DO, BOD with bed/sediment exchange, nitrification and denitrification, and coliform decay processes are considered in the model calculation. The model is studied under normal and extreme water quality conditions at the intake point. Water quality parameters and coefficients applied in the predictions are also compared with the coefficients of similar models developed by Mike 11. The results of the study indicate that the construction of covering structure reduces dissolved oxygen concentration, which is an important water quality indicator, to a certain level lower than 0.3-0.7 mg/I of the initial concentration (4.0-6.0 mg/I). However, the modelling results also bring out that the minimum level of concentrations at the point of interests are not expected to affect the required raw water quality standards (2.0 mg/I) for water treatment processes. Recommendations are made for further studies, modification and validation of the model in future, operation and maintenance problems with sediment depositions in the closed pipe, and importance of atmospheric reaeration. |
Year | 2001 |
Type | Thesis |
School | School of Environment, Resources, and Development (SERD) |
Department | Department of Energy and Climate Change (Former title: Department of Energy, Environment, and Climate Change (DEECC)) |
Academic Program/FoS | Environmental Engineering and Management (EV) |
Chairperson(s) | Annachhatre, Ajit P. |
Examination Committee(s) | Tawatchai Tingsanchali ; Trankler, Josef;Mark, Ole |
Scholarship Donor(s) | Asian Institute of Technology Partial Scholarship |
Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2001 |