Melen Havzasında Besin Maddeleri için Nehir Alıkonum Katsayısının Tespiti

Abstract

Melen Watershed is the most recent and the leading drinking water source of Istanbul. According to The Ministry of Forest and Water Works of Turkey, regarding the pollution status, Melen River Basin should be primarily dealt with. Nutrient pollution such as nitrogen (N) and phosphorus (P) can cause water quality degradation in rivers, which are used as a source of drinking water. Buyuk Melen and Kucuk Melen rivers are existed on Melen Watershed. Water supplied from Buyuk Melen River is tranferred to Omerli Dam and supplies important percent of the water demand of the Istanbul. Hence, it is crucial to observe the water quality of the supplied water in Melen Watershed. Certain percent of the nutrients that cause the organic pollution are retained through the river route. River retention coefficient is the percent that reflects how many percent of the nutrients are retained during the river flow. River retention coefficient for the rivers on the Melen Watershed was calculated according to the several factors mentioned in this study. For this purpose geographical information systems (GIS) were also dealt with and digital elevation model (DEM) was prepared using raster images scaled 1/25000. This study is aimed to be an important precedent for other basins that are determined as in priority in terms of pollution by The Ministry of Forest and Water Works of Turkey.