Changes in Summer Irrigated Crop Area and Water Use in Southeastern Turkey from 1993 to 2002: Implications for Current and Future Water Resources | Water Resources Management
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Changes in Summer Irrigated Crop Area and Water Use in Southeastern Turkey from 1993 to 2002: Implications for Current and Future Water Resources

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Abstract

Changes in summer irrigated cropland acreage and related water use are estimated from satellite remote sensing and ancillary data in semi-arid Southeastern Turkey where traditionally dry agricultural lands are being rapidly transformed into irrigated fields with the help of water from the Euphrates-Tigris Rivers. An image classification methodology based on thresholding of Landsat NDVI images from the peak summer period reveals that the total area of summer irrigated crops has increased three-fold (from 35,000 ha to over 100,000) in the Harran Plain between 1993 and 2002. Coupled analysis of annual irrigated crop area from remote sensing and potential evapotranspiration based estimates of irrigation water requirements for cotton indicate a corresponding increase in agricultural water use from about 370 million cubic meters to over one billion cubic meters, a volume in accordance with the state estimates. These estimates have important implications for understanding the rapid changes in current agricultural withdrawals in Southeastern Turkey and form a quantitative basis for exploring the changes in future water demands in the region. For example, expansion of irrigated lands have led to a steady decrease in potential evaporation due to increased roughness and decreased humidity deficit in the Harran Plain. Assuming that the changes in future evaporation conditions will be of similar nature, water use for irrigation is expected to decrease over 40 percent in future irrigation sites. Incorporating this decrease in overall planning of the irrigation projects currently under construction should lead to improved management, and by extension, sustainability of water resources in the region.

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Authors and Affiliations

  1. Hydrologic Sciences Branch, Mail Code 614.3, NASA/GSFC, Greenbelt, MD, 20771, USA

    Mutlu Ozdogan

  2. Department of Geography, Boston University, 675 Commonwealth Avenue, Boston, MA, 02215, USA

    Curtis E. Woodcock & Guido D. Salvucci

  3. GAP Regional Development Offices, P.K. 155, Urfa Tuneli Agzi, 63000, Sanliurfa, Turkey

    Hüseyin Demir

Authors
  1. Mutlu Ozdogan
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  2. Curtis E. Woodcock
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  3. Guido D. Salvucci
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  4. Hüseyin Demir
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Correspondence to Mutlu Ozdogan.

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Ozdogan, M., Woodcock, C.E., Salvucci, G.D. et al. Changes in Summer Irrigated Crop Area and Water Use in Southeastern Turkey from 1993 to 2002: Implications for Current and Future Water Resources. Water Resour Manage 20, 467–488 (2006). https://doi.org/10.1007/s11269-006-3087-0

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  • DOI: https://doi.org/10.1007/s11269-006-3087-0

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