TEMPERATURE AND DISSOLVED OXYGEN STRATIFICATION IN ALMUS DAM LAKE ON YEŞILIRMAK RIVER (TURKEY) AND ITS GIS MAPS

The temperature and dissolved oxygen parameters of Almus Dam Lake located in the district Almus of province Tokat were seasonally determined at nine stations located along the lake. The water quality class of Almus Dam Lake was determined by comparing the results of our measured parameters with the values of Intercontinental Water Sources Quality Classification. The spatial and seasonal variations in physical parameters were analyzed with the Two-Way ANOVA, the relationships among these parameters. According to Intercontinental Water Sources Quality Classification, Almus Dam Lake has Class I water quality when considering parameters of temperature (14.30±7.44C°), dissolved oxygen (10.15±2.67mg/L. With the examination of seasonal temperature-depth profile, it was observed that winter stagnation and spring and fall vertical mixing occurred during the January and March and spring May and November, respectively. Temperature stratification was clearly observed during the July and September. Epilimnion, metalimnion (thermocline) and hypolimnion were well clearly visible at the first 10 meters, between 10–20 meters, and below 20 meters, respectively . GIS maps with spatial and seasonal values ​​ were created for temperature and dissolved oxygen variables.