Introducing of Ce-Qual-W2 Model and Its Application - Water Quality Management: Assessment and Interpretation - page 97

4 was gathered from Power Ministry and Meteorological Organization
data and item 5 were assessed monthly from May 2003 to December 2003 by
Badrghasemi ( 2002 ) for two reasons which are as follows:
Collection of water quality data which is necessary for Ce-Qual-W2 model
calibration and con

Item 1

-

rmation including water temperature and TDS parameters.

rmation of two dimensional assumption of the reservoir.
Data of Jologeir and Payapol stations was applied as boundary conditions and
data from inside the reservoir was used for calibration and con

Con

rmation of the

model (temperature pro le and TDS of May 2003 were used as initial conditions of

the model).
Considering the shape of the reservoir which is 65 km long and 5 km widths and
variation of TDS, temperature parameter at the surface of the water was about
3

5 %. It was assumed that the variation of water quality across the width of the
reservoir was negligible. Therefore, for simulation of TDS and Temperature a two
dimensional model (Ce-Qual-w2), was considered suitable for the evaluation of the
reservoir.
Another reason for selecting the two dimensional model was that the distance
between two outlets of the reservoir which was relatively high (Dashte Abbas
tunnel in 40 km and outlet of the reservoir in 65 km) and variations in length of the
reservoir are visible.
Ce-Qual-W2 is a two-dimensional model which was applied to simulation of
hydrodynamic and water quality of the reservoir in length and height, it was used
for all mean parameters in the width of a reservoir.
The selected model in this case study was carried out for 688 days of simulation,
and the data of TDS and temperature of the

-

first 200 days of simulation were used

for con rmation of the model and the rest of the data used for prediction of

variation of water quality in the reservoir. The first day of experimental work was

Mays 5th 2003; this was the day also selected as the first day of simulation.

The length of the reservoir was divided into 66 equal parts, each of them equal to
1,000 m and the height of the reservoir was divided into 62 layers, the height of
each layer was between 1.5 and 4 m. Figure 6.3 indicates a simulation of the
geometry of the reservoir.
First, the reservoir geometry de ned for the model, second, meteorological data

le, initial conditions, boundary condition and wind con nement correction

de ned.

The

first step of constructing a model is model calibration and also Ce-Qual-W2
model needs to evaluate the temperature and the amounts of TDS of each layer for
analyzing densities of different layers. Hence, before the simulation of TDS, it is
necessary to construct temperature strati cation models and then it is necessary to

calibrate temperature and TDS parameters. Whenever the results of simulation are
con

dent, then the prediction of TDS parameter will be carried out for future.
The result for the first temperature and TDS simulation models were not matched

to the experimental study. Therefore, the calibration of the model begun. First, the
geometry and second the water level of the reservoir was calibrated.