| 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 (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 |