Investigation of Withdrawal Location on the Salinity of the 15thKhordad Reservoir’s Water

Subject Areas : Article frome a thesis

M.E KH ¹ , A. اقبالزاده ² , M. افتخاری ³ , M. جوان ⁴

1 - دانش آموخته کارشناسی ارشد عمران-آب، دانشکاه رازی کرمانشاه
2 - استادیار گروه مهندسی عمران دانشگاه رازی کرمانشاه
3 - استادیار گروه مهندسی عمران دانشگاه رازی کرمانشاه
4 - استادیار گروه مهندسی عمران دانشگاه رازی کرمانشاه

Received: 2014-10-01 Accepted : 2014-10-01 Published : 2014-11-22

Keywords: CE-QUAL-W2, 15th Khordad Reservoir, total dissolved solid, reduction of salinity input,

Abstract :

The 15^th khordad Dam reservoir with a total volume of 200 million cubic meters is the first dam which was built over a brackish river in Iran. The reservoir was put into service in 1994. In the beginning, the total amount of total dissolved solid of the reservoir’s water was 600 mg/lit; it increased to 2500 mg/lit 5 years later.To simulate the temperature and salinity distribution in the reservoir, a two-dimensional width averaged model (CE-QUAL-W2) was used. By using the calibrated model, the effect of water withdrawal location and also the reduction of the entering salinity in the reservoir on the salinity profiles were studied. The result revealed that the location of water withdrawal (1408 and 1430 m above the mean sea level) did not affect the salinity profiles; hence, this option could not prevent the salinity increase of the reservoir. However, identification of the salinity sources, and prevention of the saline water entry into the Dam Rude may somewhat mitigate the salinity of the pounded water in the reservoir.  Results show that with a reduction of 25% in the entering salinity, the rate of increase in the reservoir salinity was small, but with a 50 percent reduction in the entering salinity, there is a possibility of reduction in salinity of the reservoir.