University of Qom Civil Infrastructure Researches 2783-140X 7 1 2021 08 23 Impact of Land Use Changes and Expanding of Irrigation on Drying up of the Bakhtegan and Tashk Lakes Impact of Land Use Changes and Expanding of Irrigation on Drying up of the Bakhtegan and Tashk Lakes 53 65 1912 10.22091/cer.2021.7001.1255 FA Zeinab Hoseini School of Geology, College of Science, University of Tehran. Morteza Mozafari School of Geology, College of Sciences, University of Tehran, Tehran, Iran 0000-0001-8106-5655 Elham Fijani School of Geology, College of Science, University of Tehran Journal Article 2021 05 31 The Bakhtegan and Tashk lakes (SW Iran) have been rapidly drying up during since 2007. In the absence of sufficient data, impacts of changes in land use on drying up of the lakes remain as yet undetermined. At this study, an attempt has been made to determine the effect of land use changes on shrinking of the lakes. The changes in the area of Bakhtegan and Tashk lakes together with the area of irrigated lands during the last three decades were determined by remote sensing analysis. By beginning of 1987 until 2007, the area of irrigated lands was increased from 1253.01 to 2506.11 km2 at all plains in the basin. Since 2007, two different behaviors have been detected in the area of irrigated lands at the upstream and downstream sectors of the basin. At downstream, all plains have experienced a significant reduction in the area of agricultural lands, but a considerable extension was detected in the upstream plains, where the lands were mainly cultivated with rice. Results show that the Bakhtegan and Tashk lakes had completely dried up as a result of the combined effects of meteorological drought and irrigation development (particularly at the upstream part of the basin). The Bakhtegan and Tashk lakes (SW Iran) have been rapidly drying up during since 2007. In the absence of sufficient data, impacts of changes in land use on drying up of the lakes remain as yet undetermined. At this study, an attempt has been made to determine the effect of land use changes on shrinking of the lakes. The changes in the area of Bakhtegan and Tashk lakes together with the area of irrigated lands during the last three decades were determined by remote sensing analysis. By beginning of 1987 until 2007, the area of irrigated lands was increased from 1253.01 to 2506.11 km2 at all plains in the basin. Since 2007, two different behaviors have been detected in the area of irrigated lands at the upstream and downstream sectors of the basin. At downstream, all plains have experienced a significant reduction in the area of agricultural lands, but a considerable extension was detected in the upstream plains, where the lands were mainly cultivated with rice. Results show that the Bakhtegan and Tashk lakes had completely dried up as a result of the combined effects of meteorological drought and irrigation development (particularly at the upstream part of the basin). https://cer.qom.ac.ir/article_1912_c96625963932bb2cf3f237aa2c3bdd55.pdf