Mogan and Eymir Lakes, located 20 km south of Ankara, 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 (1) to quantify
groundwater components in lakes&rsquo / budgets, (2) to assess the potential impacts of
upstream reservoirs on lake levels, and (3) to determine effects of potential
climatic change on lakes and groundwater levels in the basin. Available data have
been used to develop a conceptual model of the system. The three dimensional
groundwater model (MODFLOW) has been developed for the system. The model
has been calibrated successfully under transient conditions over a period of six
years using monthly periods. The results show that groundwater inflows and
outflows have the lowest contribution to the overall lakes&rsquo / budget. A sensitivity
analysis was conducted to determine the limits within which the regional
parameters may vary. Three groundwater management scenarios had been
developed. The results show that the upstream reservoirs have a significant effect
on lake stages but not on groundwater levels. A trade-off curve between the
amount of water released and the average stage in Lake Mogan has been
developed. The continuation of the existing average conditions shows that there
would be declines in groundwater elevations in areas upstream from Lake Mogan
and downstream from Lake Eymir. The results also indicated that very small, but
long-term changes to precipitation and temperature have the potential to cause
significant declines in groundwater and lake levels.
| Identifer | oai:union.ndltd.org:METU/oai:etd.lib.metu.edu.tr:http://etd.lib.metu.edu.tr/upload/12608456/index.pdf |
| Date | 01 June 2007 |
| Creators | Yagbasan, Ozlem |
| Contributors | Yazicigil, Hasan |
| Publisher | METU |
| Source Sets | Middle East Technical Univ. |
| Language | English |
| Detected Language | English |
| Type | Ph.D. Thesis |
| Format | text/pdf |
| Rights | To liberate the content for public access |
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