بررسی و تحلیل روند خشکسالی در حوضۀ آبخیز سد گیوی با رویکرد چندشاخصی

نوع مقاله : پژوهشی

نویسندگان

1 استادیار گروه مهندسی عمران، دانشکدۀ فنی مهندسی، دانشگاه محقق اردبیلی، اردبیل، ایران

2 دانشجوی کارشناسی ارشد مهندسی عمران- مهندسی و مدیریت منابع آب، دانشکدۀ فنی مهندسی، دانشگاه محقق اردبیلی، اردبیل، ایران

چکیده

ارزیابی وضعیت و روند شکل‏گیری خشکسالی همواره یکی از عوامل مهم برای مقابله با آثار مخرب این پدیده است. برای بررسی خشکسالی، با توجه به موقعیت مکانی، در بازه‏های زمانی مشخص، از شاخص‏های مختلفی استفاده می‏شود. هدف اصلی ‌تحقیق حاضر، ارزیابی وضعیت خشکسالی حوضۀ آبخیز سد گیوی با استفاده از معیارهای چندشاخصی است. به این منظور، به کمک داده‏های بارندگی دو ایستگاه منتخب در حوضۀ آبخیز سد گیوی، طی یک دورۀ آماری 31 ساله، با به‌کار‏گیری شاخص‏های SPI، RDI، CZI، SZI، PNI، DI این پدیده تجزیه‌وتحلیل شد. نتایج نشان داد در سال‏های 1384، 1387 و 1392 در ایستگاه خلخال و در سال‏های 1392 و 1396 در ایستگاه فیروزآباد خشکسالی شدید رخ داده ‏است. همچنین، با استفاده از شاخص خشکسالی مؤثر (EDI)، تعداد روزهای خشک در فصل‌های پاییز و زمستان در سال‏هایی که خشکسالی شدید بود، به دست آمد. با بررسی شاخص‏ها به‌صورت ماهانه معین شد ضمن شباهت نسبتاً زیاد شاخص‏های SPI، CZI، SZI و RDI در نشان دادن اصلی‏ترین دوره‏های خشکسالی و ترسالی، شاخص SPI در تشخیص آغاز دوره‏های خشکسالی نسبت به دیگر شاخص‏ها کارایی بهتری دارد.

کلیدواژه‌ها


عنوان مقاله [English]

Investigating and Analyzing the Drought Trend in the Givi Dam Catchment with a Multiple Index Approach

نویسندگان [English]

  • Atabak Feizi 1
  • Vahid Maleki 2
1 Assistant Professor of Civil Engineering, Faculty of Engineering, University of Mohaghegh Ardabili, Ardabil, Iran
2 M.Sc. Student in Civil Engineering Water Resource Management and Engineering, University of Mohaghegh Ardabili, Ardabil, Iran
چکیده [English]

Assessing the drought situation and formation trend has always been one of the most important factors to deal with the devastating effects of this phenomenon. Different indices are used to determine the drought, depending on location in specific periods. The main purpose of this study is to assess the drought situation of Givi Dam Catchment with the multiple index approach. Accordingly, this phenomenon was analyzed using the precipitation data of the two selected stations in the Givi Dam Catchment during a 31-year statistical period, using SPI, RDI, CZI, SZI, PNI, and DI. The results showed that severe drought occurred in 2005, 2008, and 2013 in Khalkhal station and 2013 and 2017 in Firoozabad station. Moreover, using the Effective Drought Index (EDI), the number of dry days was obtained in the fall and winter seasons of the years with severe drought. By examining the indicators monthly, it became clear that despite the relatively high similarity of SPI, CZI, SZI, and RDI in showing the main drought and wet periods, SPI is more effective in detecting the onset of drought periods than the other indices.

کلیدواژه‌ها [English]

  • Standardized precipitation
  • Effective Drought
  • RDI
  • Givi Dam Catchment
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