Hydrologic impacts of climate and land-use change on Namnam Stream in Koycegiz Watershed, Turkey

  • M. A. Baloch
  • D. P. Ames
  • A. Tanik
Original Paper


The effects of land-use and climate change on the hydrologic regime of the Namnam Stream in the Koycegiz Watershed, Turkey, are quantified using a hydrologic simulation modeling system under a number of real and potential scenarios. The study shows that urbanization has induced severe modification in the magnitude, frequency, and duration of extreme flow conditions. The mean annual flows increased by 5–60 % due to 0.1–50 % increase in impervious surfaces. Additionally, confounding climate change impacts include an increase in low flow pulses of 2 % when considering a decrease in precipitation by 20 % and a decrease in low flow pulses of 12 % when considering a 20 % increase in precipitation. The watershed system under investigation is significantly more sensitive to climate change scenarios involving additional inputs of precipitation compared with scenarios involving reductions in precipitation and that these changes are compounded in the presence of major land-use change. These results suggest the need for erosion control, nutrient management and habitat conservation in light of rapid urbanization, as often typified in developing countries, and potential climate change to conserve essential watershed functions.


Hydrologic regime Deforestation Urbanization Scenario analysis Climate change 



This work was supported in part by the US National Science Foundation under the Idaho NSF EPSCoR grant EPS 0814387. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the National Science Foundation.


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Copyright information

© Islamic Azad University (IAU) 2014

Authors and Affiliations

  1. 1.Department of Environmental Engineering, Faculty of Civil EngineeringIstanbul Technical University (ITU)Maslak, IstanbulTurkey
  2. 2.Department of Civil and Environmental EngineeringBrigham Young UniversityProvoUSA
  3. 3.REB ModelAnalytics LLCAtlantaUSA

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