Investigation of Annual Lake Water Levels and Water Volumes with Şen Innovation and Mann-Kendall Rank Correlation Trend Tests: Example of Lake Eğirdir, Turkey
Ali Yücel,
Monika Markovic,
Atilgan Atilgan,
Roman Rolbiecki,
Hasan Ertop,
Barbara Jagosz,
Wiesław Ptach,
Ariel Łangowski,
Tomasz Jakubowski
Affiliations
Ali Yücel
Osmaniye Vocational School, Construction Technology, Osmaniye Korkut Ata University, 80000 Osmaniye, Turkey
Monika Markovic
Department for Plant Production and Biotechnology, Faculty of Agrobiotechnical Sciences, University of Osijek, 31000 Osijek, Croatia
Atilgan Atilgan
Department of Biosystem Engineering, Faculty of Engineering, Alanya Alaaddin Keykubat University, 07425 Alanya, Turkey
Roman Rolbiecki
Department of Agrometeorology, Plant Irrigation and Horticulture, Faculty of Agriculture and Biotechnology, Bydgoszcz University of Science and Technology, 85059 Bydgoszcz, Poland
Hasan Ertop
Faculty of Agriculture, Agricultural Structures and Irrigation, Isparta University of Applied Science, 32200 Isparta, Turkey
Barbara Jagosz
Department of Plant Biology and Biotechnology, Faculty of Biotechnology and Horticulture, University of Agriculture in Krakow, 31120 Krakow, Poland
Wiesław Ptach
Department of Remote Sensing and Environmental Research, Institute of Environmental Engineering, Warsaw University of Life Sciences, 16602 Warszawa, Poland
Ariel Łangowski
Department of Agrometeorology, Plant Irrigation and Horticulture, Faculty of Agriculture and Biotechnology, Bydgoszcz University of Science and Technology, 85059 Bydgoszcz, Poland
Tomasz Jakubowski
Department of Machinery Exploitation, Ergonomics and Production Processes, Faculty of Production and Power Engineering, University of Agriculture in Krakow, 31120 Krakow, Poland
Lakes are the most important freshwater resources for humans. It is stated that together with population growth, unplanned urbanization, excessive water consumption, industrialization, and unconscious irrigation, global climate change causes changes in the water levels and volumes of lakes. Lake Eğirdir in Turkey, which is important in terms of drinking and irrigation water use, was chosen as the study area. Lake Eğirdir water level (LWL) and water volume (LWV) values measured between 1988–2019 were used. Dependencies in the annual LWL and LWV were examined by autocorrelation analysis, and trend changes were examined by regression analysis, the Mann-Kendall rank correlation test, and the Şen innovation trend test. The research has shown a significant decrease since 2000 in LWL and since 1990 in LWV. The LWL has decreased by −1.272 to −3.514 m and the LWV has decreased by −72.980 to −1082.134 hm3 in approximately 32 years. The actions to be taken based on the values determined in this study will help protect the water resources of lakes. As a result of the tests used in our study, it was determined that there were decreases in both the water level and the volume of the lake. The climatic changes in the lake basin and the decrease in the water resources feeding the lake are shown as the biggest factor in these reductions.
