STUDY ON EUTROPHICATION CHANGE AND THEIR CONSEQUENCES IN PALIASTOMI LAKE

Background: The article describes the study of chlorophyll concentration dynamics in Paliastom lake and its surrounding area. The research covers the period from 2015 to 2022. The study uses remote sensing satellite images obtained from Landsat 8, Sentinel-2, as a result of processing in the SNAP application. At the same time, in situ researches was performed. Aims: This study aims to research chlorophyll concentration in Paliastom lake and its adjacent area through remote sensing methods and in situ data. Methods: For our research and historical data collection, satellite remote sensing was applied, which generates data on spatial and temporal variations of suspended particles in estuaries and coastlines. In situ studies, Chlorophyll concentration and promoting chemical agents were measured, water temperature, pH, total hardness, alkalinity, acidity, and others. Total turbidity was determined, and qualitative reactions were performed to define the presence of phosphates and nitrates. Results: The results received through remote sensing, and in situ studies were compared. Paliastom lake and its adjacent area are prone to eutrophication processes. Natural phenomena and human industrial activity cause the process. Discussion: According to in situ studies and the data obtained from sensors, the water in Paliastom lake is prone to a weak alkaline reaction. The water of the lake can be considered as having medium turbidity. Phosphate and nitrate ion detection reactions performed with qualitative analysis protocols showed positive samples. The intensity of the obtained color indicated their high concentration. Conclusions: The annual evolution of Chl-a in Paliastom lake reaches the maximum value in the summer months. Compared to previous years, a decrease in chlorophyll concentration was observed during the lockdown period of 2020 due to the Covid Pandemic.