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بررسی و تحلیل روند خشکسالی در حوضۀ آبخیز سد گیوی با رویکرد چندشاخصی | ||
اکوهیدرولوژی | ||
مقاله 21، دوره 7، شماره 3، مهر 1399، صفحه 829-542 اصل مقاله (971.1 K) | ||
نوع مقاله: پژوهشی | ||
شناسه دیجیتال (DOI): 10.22059/ije.2020.305529.1348 | ||
نویسندگان | ||
اتابک فیضی* 1؛ وحید ملکی2 | ||
1استادیار گروه مهندسی عمران، دانشکدۀ فنی مهندسی، دانشگاه محقق اردبیلی، اردبیل، ایران | ||
2دانشجوی 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 | ||
بارش استانداردشده؛ حوضۀ آبخیز سد گیوی؛ خشکسالی مؤثر؛ شاخص RDI | ||
مراجع | ||
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