| چکیده انگلیسی مقاله |
This study examines the spatial variations of water quality of the AlvandRiver in the west of KermanshahProvince. Nine sites were selected for sampling from the Alvand corridor، and ten parameters of water quality-temperature of environment (ET), temperature of river (ER), pH, dissolved oxygen (DO), biochemical oxygen demand (BOD), chemical oxygen demand (COD), electric conductivity, turbidity, TDS and salinity were measured twice in each season. In order to measure heavy metals (Cu, Al, Cr, Pb, Cd, Ni, Mn, V) and also for measuring the total coli form and the faucal coliform, two samples were taken on March and August 2006. The comparative and cluster analysis of the data show that increase in most parameters of water quality and coli forms gradually increased in a downstream direction through crossing populated sites. However, irregular flucatuations of turbidity and COD were observed at the entrance of Ghare-Boolagh. The fluctuation of river heavy metals was found to be considerable. The amount of Cr and Ni were especially high in the Rijab (first station); nevertheless, most other heavy metals were reached their peak in the middle of the river, between Sar-pol-e-Zahab and Ghare-Boolagh, especially before Ghare-Boolagh. A small branch of the river joining from the north of the region seems to be responsible for most of the increases observed in the heavy metals. Turbidity, Cod, Cd and Pb were respectively 16 N.T.U., 8 mg/L, 111.2 and 2.9 pbb at this branch of Alvand river. Whereas, these parameters were respectively 0.068 N.T.U., 0.199 mg/L, 0.068 and, 199 pbb at Rijab in the upstream. |