Determination of groundwater recharge and hydrological characteristics by using environmental isotope techniques in the Hazar Lake basin

In this study, Hazar Lake is used for physical - chemical analyzes in 60 locations from wells, welds and rivers with 12 water samples in 6 locations, 0.5 m depth from the surface and lake surface, 51 locally heavy metal analyzes, 18O, 2H analyzes and 23 loci Water samples were taken for 3H analysis. In the water samples taken from the waters, oxygen was found between ‰-18 ‰-9- ‰10.02, Deuterium value between ‰ -52.71 and ‰ -61.06, oxygen in the water from the wells was found to be -18.41 and -6.32 ‰ -10.41 and deuterium values between -43.52 ‰ and -‰65.44, in the water samples taken from the rivers, the values of oxygen 18 between ‰ -8.88 and ‰8.9, between deuterium value ‰ -53.95 and ‰ -54.4, in the samples taken from surface water of Caspian Lake, oxygen 18 value -0.41 ‰ with -1.57 ‰, with deuterium value ‰ -9.27 ‰- 15, in the water samples taken at a depth of 0.5 m from the surface of the Caspian Lake, the oxygen values were ‰ -0.28 to ‰ -0.89, and deuterium values ‰ -8.55 to ‰ -15.31. The equation of evaporation line drawn for all water samples taken from the study area is calculated as δD = 5.4195 δ18O - 7.7183. It has been determined that the Caspian Lake Basin is under the terrestrial precipitation