Quality Categorization of Sardabrood River in Different Landscapes Using Fuzzy Sets Method

Increasing the river's pollution and Reducing their quality is management esseutial for their usage. notifies management. The Sardabrood river which is taken into account as one protected river in the Caspian sea- northern Iran- flows through variety ecosystems. Therefore, for the management of this river, assessing the quality of this river related to the present ecosystems surrounding its basin is the basic task which this research presents. First, employing landscape ecology approach, four major landscapes were distinguished which result in river zoning. Those are consist of the Mountain, Kelardasht plain, Forest and the Chalous lowland landscapes. Then, in two seasons, winter with the lowest pollution rate and summer with the highest pollutants; sampling was carried out in the discharge at the strategic locations of each landscapes. Consequently, eight stations were selected and fourteen parameters including water temperature PH DO B.O.D C.O.D EC Turbidity NO2 NO3 NH4 Caco3 CL T.S.S T.D.S and four toxic metals (i.e., Fe Ba Pb Cr ) were measured. The fuzzy sets theory was employed for the analysis of the data related to each landscape in order to doing river quality zoning. Results showes that the river's quality is significantly affected by each ecosystem and its water quality and quality on Virgain landscape is very sufficient. however in human landscapes, quality is associated with the intensity of human activities. River quality in the Mountain landscape is the best, in Kelardasht plain landscape is moderate, in the Forest landscape is as well and the Chalous lowland landscape has poor quality.