Sustainable management of Mogan and Eymir Lakes in Central Turkey |
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Authors: | Ozlem Yagbasan Hasan Yazicigil |
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Institution: | (1) Institute of Natural Sciences, Gazi University, 06570 Ankara, Turkey;(2) Department of Geological Engineering, Middle East Technical University, 06531 Ankara, Turkey |
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Abstract: | Mogan and Eymir Lakes, located 20 km south of Ankara in Central Turkey, are important aesthetic, recreational, and ecological
resources. Dikilitas and Ikizce reservoirs, constructed on upstream surface waters, are two man-made structures in the basin
encompassing an area of 985 km2. The purpose of this study is to quantify groundwater components in lakes’ budgets and to assess the potential impacts of
upstream reservoirs on lake levels for sustainable management of the system. Available data have been used to develop a conceptual
model of the system. A three-dimensional groundwater model, incorporating a lake component, has been developed for the system.
The model has been calibrated successfully under transient conditions over a period of 6 years using monthly periods. The
results show that groundwater inflows and outflows have the lowest contribution to the overall lakes’ budget. The model has
been subsequently used to evaluate the impacts of upstream reservoirs. The results show that these reservoirs have a significant
effect on lake stages but not on groundwater levels. A trade-off curve between the quantum of water released and the average
stage in Lake Mogan has been developed to enhance decision makers’ ability for sustainable management of the system in the
long term. |
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Keywords: | Mogan and Eymir Lakes Sustainability Lake and aquifer interaction Simulation Calibration |
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