Investigation of the geology, tectonic and oceanography of the Karagöl

Geological-geomorphological and limnological investigation of the Karagöl, which is the area of 2 km²(2 ha) and mentioned Tantalos legend in mythology, located height of around 800 meters from the sea level in the plain at the Yamanlar Mount foothills, about 40 km away from the center of Karsiyaka district of Izmir, was studied. In this context, depth map(bathymetry), bottom sediments, characteristics of ground, microbiological and physico-chemical analysis of lake were carried out.Geological sampling in three point in the lake, temperature, salinity, conductivity, ph values of surface water upon at the same time water samples for dissolved oxygen values were taken. Data from the survey as morphological lake bottom is almost uniform in the middle of the lake, even if the coast is seen as the height because of surrounding mountains. The southeastern part of the lake has a maximum depth, depth is about 7-7.5 meter. The presence of sediments accumulated in the southeastern end of the lake, rain waters that created the source of the lake and a small stream feeding the lake in the eastern part is showed that the water flows are concentrated in this area. The result of seismic and sedimentologic evalution of data, fine sandy soft sediment is at the bottom of ground and under its a layer is the most sand rate was identified. When the thickness of sediment between the two layers are calculated, dominant thickness value in the lake is between 1.05 and 1.25 meter. Seismic studies showed that the formation of the lake is a landslide lake which is created in the mirror of the fault. Water samples were taken from surface water of lake to assess from microbiological point of view, fecal coliform and fecal streptococci analysis were executed. A serious pollution that is fecal source throughout of lake were not determined. Ph, temperature, salinity, conductivity and dissolved oxygen values of lake water were obtained in the expected values. Whenphysico-chemical properties are evaluated, water of lake is fresh and water quality is generally designated good.