Comparative analysis of Lake Urmia and Lake Van water level time series |
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| Authors: | Sheida Jalili Sajad Ahmad Hamidi Saeed Morid Reza Namdar Ghanbari |
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| Institution: | 1.Technical and Engineering Department,Azad University of Urmia,Urmia,Iran;2.Department of Physics, College of Natural Sciences and Mathematics,Indiana University of Pennsylvania,Indiana,USA;3.College of Agricultural Engineering,Tarbiat Modares University,Tehran,Iran;4.Department of Civil and Environmental Engineering,University of Wisconsin-Milwaukee,Milwaukee,USA |
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| Abstract: | Recent decline in Lake Urmia water level makes it crucial to consider this issue more seriously. For this purpose, comparison of water level in Lake Urmia with Lake Van in Turkey, which is in relatively similar geographic and climate conditions, can be an effective approach. To follow this objective, trend analysis, regime shift, and coherency analyses are implemented. The results showed negative trend in Lake Urmia water level for the past 20 years, while in Lake Van, the trend is positive. Moreover, correlation of the lake level variations versus the basin rainfall during three common periods, identified by the regime shifts analysis, illustrated a decreasing trend in the correlation. These changes can be attributed to non-climatic factors such as different allocation disciplines in two lake’s catchments. Finally, the coherency analysis showed significant annual and inter-annual frequencies common between the two lake levels. Herein, the short-term period relations are associated with lags, while in long term, they act simultaneously. |
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