Yuwadee Wongbiasajj. Integration of mathematical model (MIKE11) and geographical information system (GIS) for a prediction of water quality in the lower reach of Chao Phraya River. Master's Degree(Environmental Technology). Mahidol University. : Mahidol University, 2004.
Integration of mathematical model (MIKE11) and geographical information system (GIS) for a prediction of water quality in the lower reach of Chao Phraya River
Abstract:
This study aimed to predict water quality in the lower reach of the Chao Phraya River by
using Mathematical Modeling (MIKE11) incoporated with the Geographic Information System (GIS).
Calibration of MIKE 11 Hydrodynamic Module, Advection-Dispersion Module and Water quality
Module took place during low flow period, i.e.February May, in the year 1995, verification of this
model was conducted during the lower flow period in the year 2001. The study area covered the lower
reach of the Chao Phraya River, which was about 83 km. in length starting from Nonthaburi Bridge in
Nonthaburi to the river mouth in Samut Prakarn. Selected water quality parameters were dissolved
oxygen (DO), biochemical oxygen demand (BOD), salinity and temperature.
BOD loading in the year 1995 was calculated based on qualitative and quantitative
measurements, from various sewage drains and canals in different communities, industries and piggery
sources in the area of Nonthaburi, Bangkok and Samut Prakarn provinces. Prediction on the amount of
wastewater in 2001, 2007 and 2012 was calculated by taking into account the population growth rate as
well as economical and industrial growth rates.
The study results indicated that water quality of lower Chao Phraya River in the year
1995 and 2001 were lower than those of the required surface water qualities standard. However, it is
expected that the average values of water quality would meet the required standard up to the year 2007
if seven wastewater treatment projects could be fully implemented according to Bangkok Metropolitan
Region wastewater treatment plan. After 2007, the water quality is expected to be lower than the
requied standards again due to the high population rate. Therefore, development of a proper pollution
management strategy to ensure good water quality in the river should be considered