نوع مقاله : مقاله پژوهشی
عنوان مقاله English
نویسندگان English
The purpose of this study was to investigate the water quality condition of Sarabrud River using Iran surface water quality index and biological value index. To achieve this purpose, five sampling stations were selected along the Sardabrud River based on limnological principles and establishment of contaminant sources and sampling of water and benthos was done by three replications in both cold and warm seasons. 11 water quality parameters including: BOD5, COD, Ammonium, nitrate, phosphate, turbidity, pH, faecal coliform and electrical conductivity were measured and analyzed using standard methods. Based on the results, in cold season, biological value index was lower than warm season. This index, at upstream station was 1 and 2/43 in cold and warm seasons, respectively. On the basis of saproby table, in cold season, all the stations were in oligosaprobe condition and middle was in betamesosaprobe condition. Also in warm season, downstream was in oligosaprobe and the others were in betamesosaprobe condition. IRWQIsc index was decreased in both seasons and its amount in cold season was higher than warm season. This value, in cold season ranged from 58/5 to 90/7. Downstream station was in relatively good quality condition in both seasons and two upstream stations had a very good condition in cold season. Also, in warm season, IRWQIsc index ranged from 55/26 to 90/38. The upstream stations of Sardabrud and Kelardasht were in very good and good condition, respectively, middle station and Najjarkola were in relatively good condition. Municipal, agricultural and domestic sewages, could lead to increase contamination and reduce the quality of water from upstream to downstream. In order to manage the quality condition of the river, compilation of a complete protection plan for Sardabrud River with the approach of maintaining the existing conditions is recommended.
کلیدواژهها English
