Introducing of Ce-Qual-W2 Model and Its Application - Water Quality Management: Assessment and Interpretation - page 92

after construction of the dam across the river described a reduction in salinity
(Shiati 1996 ).
Bookan dam in Kurdistan province across the Zareneh River in Iran was also
studied for variations in salinity. The result of the study presented weak stratifi-

-
cation (TDS) (Sarang and Tajreshi 2001 ). This may be due to the low height of the
reservoir and the temperate climate situation.
TDS and temperature parameters were also evaluated in long lake reservoir with
40 km length across Spokane River and compared to the data generated using the
Ce-Qual-W2 model for simulation. The result of the model and the observed data
were the same (Berger and Wells 2001 ).
Using the Dyresm model to evaluate TDS data between 1961 1990 in Raes Ali

Delvary above the Shapoor dam in Iran, the result indicated strong strati

-

cation of

TDS and Temperature.
Rounds ( 2001 ) indicated success and failure of CEQUAL-W2 by a modeling
study of the Tualatin River in northwestern Oregon. In his study, CEQUAL-W2
was used successfully to assess the sources and transport of phosphorus, quantify
the river cance of the

sources and sinks of dissolved oxygen, quantify the factors that affect phyto-
plankton growth, and test the effects of potential management strategies.
Razdar et al. ( 2011 ) compared the results of the CE-QUAL-W2 model with the
WASP5 and MIKE11 models to assess the water quality of Pasikhan River. The
contaminant loadings of Nitrate and Phosphate was utilized in the CE-QUAL-W2,
WASP5 and MIKE11 simulations. The sensitivity analysis for CE-QUAL-W2
model indicated that the model is highly sensitive to the Manning coef

' s ammonia assimilative capacity, determine the relative signi

cient and

point source flow rate. The calibrated model responses was in good agreement with

the actual data and could be applied as scenario generators in a general strategy to
conserveor improve the water quality. During the period of intense strati

cation,
forecasting from CE-QUALW2 are inconsistent better to the actual data than those
from Mike11 and WASP5 due to the improved transport scheme applied in
CE-QUAL-W2.

6.3 Theory of the Model

Generally the study of water quality in a reservoir consists of two sections which
are as follows:

1. Experimental study
2. Water quality simulation of mathematical model

Domain equations in the Ce-Qual-W2 program are presented in Table 6.1 , where,
in this chapter the QUAL2K (Chapra and Pelletier 2003 ) stream and river quality
model was used. QUAL2K is a modernized version of the QUAL2E (or Q2E)
model (Brown and Barnwell 1987 ). The model is supplied by the Watershed &