| dc.description.abstract | In this study, the one-dimensional MIKE 11 water quality modeling system was
applied to evaluate the water quality conditions in 2006 and forecast the effect of three
reservoirs: Duong Hoa reservoir on the Ta Trach river, Binh Dien reservoir on the Huu
Trach river and Huong Dien reservoir on the Bo river in 2012 on the water quality for the
Huong river in central Vietnam. It was assumed that the weather conditions in 2012 are the
same as 2006.
The model was calibrated using observated water quality data on 7th, April 2006. The
month of April corresponds to the lowest flow condition in the river in dry season. From the
application of the model it was found that a close match between the simulated and
measured water level, salinity, Dissolved Oxygen (DO), and Biochemical Oxygen Demand
(BOD) in the Huong river network on 7th, April, 2006 was produced. After calibration of a
few parameters, the model was then used to simulate the water quality of the Huong river for
April, 2006. Results showed that DO in the Huong river from 1st to 10th, April 2006 did not
satisfy Vietnam’s Surface Water Quality Standard - TCVN 5942 - 1995 while BOD satisfied
TCVN 5942 - 1995.
Future waste water generation for the year 2012 was estimated based on the
population growth in the Huong river basin and the extra water discharged from the three
reservoirs based on preliminary reports of storage project. In 2012, all three reservoirs:
Duong Hoa reservoir, Binh Dien reservoir, and Huong Dien reservoir will discharge into the
Huong river an additional flow of 25m3/s, 20.5m3/s, and 36.2m3/s, respectively. Results
revealed that the release of extra water is necessary for improving the water quality since DO
increases, and BOD decreases. However, DO in the Huong river from 1st to 6th, April 2012
still can not satisfy Vietnam’s Surface Water Quality Standard - TCVN 5942 - 1995.
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