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ارائه و ارزیابی شاخص جدید MRDI در پایش خشکسالی (مطالعة موردی: حوضة گرگانرود) | ||
تحقیقات آب و خاک ایران | ||
مقاله 4، دوره 46، شماره 1، فروردین 1394، صفحه 19-30 اصل مقاله (1.92 M) | ||
نوع مقاله: مقاله پژوهشی | ||
شناسه دیجیتال (DOI): 10.22059/ijswr.2015.54292 | ||
نویسندگان | ||
حسین دهبان1؛ کیومرث ابراهیمی* 2؛ شهاب عراقی نژاد3 | ||
1دانشجوی کارشناسی ارشد مهندسی منابع آب دانشگاه تهران | ||
2دانشیار گروه مهندسی آبیاری و آبادانی دانشگاه تهران | ||
3استادیار گروه مهندسی آبیاری و آبادانی دانشگاه تهران | ||
چکیده | ||
استفاده از شاخصهای خشکسالی به منظور شناسایی، پایش، و جلوگیری از آثار خشکسالی در مقیاسهای مختلف زمانی و مکانی بسیار مهم است. هدف پژوهش حاضر ارائه و ارزیابی یک شاخص جدید خشکسالی، به نام MRDI، و مقایسة آن با شاخص MSPI بر اساس شاخصهای بارش استانداردشدة SPI و شناسایی خشکسالی در مقیاسهای زمانی مختلف با رویکرد آماری PCA در حوضة آبریز گرگانرود است. بر اساس نتایج، شاخص جدید چندمتغیرة زمانی MRDI و شاخص چندمتغیرة زمانی MSPI، به دلیل لحاظ متغیرهای زمانی مؤثر، نسبت به شاخصهای تکمتغیرة SPI و RDI تحلیلهایی دقیقتر و آسانتر دارند. مقایسة نتایج MRDI و MSPI بر مبنای آزمون ناپارامتری کلموگروفـ اسمیرنوف نشان میدهد تفاوتی معنادار بین آنها وجود ندارد و بیش از 90 درصد مواقع رفتاری مشابه دارند. بررسی میزان این تشابه به تکرار این پژوهش در حوضههای معرف دیگر نیاز دارد. | ||
کلیدواژهها | ||
تحلیل مؤلفههای اساسی؛ خشکسالی؛ شاخص چندمتغیرة زمانی | ||
عنوان مقاله [English] | ||
Introduction and Assessment of a New Drought Monitoring Index, MRDI (Case Study: Gorganroud Basin, Iran) | ||
نویسندگان [English] | ||
Hossein Dehban1؛ Kumars Ebrahimi2؛ Shahab Araghinejad3 | ||
1MSc Student of Water Resources Engineering, University of Tehran | ||
2Associate Professor, Irrigation and Reclamation Engineering Department, University of Tehran | ||
3Assistant Professor, Irrigation and Reclamation Engineering Department, University of Tehran | ||
چکیده [English] | ||
In order to avoid drought effects, it is essential to detect and monitor the spatial and temporal changes of the phenomenon. In General, drought indices are made use of to achieve the goals. The main aim followed in this paper is to introduce and assess a new drought index termed MRDI. MRDI (Modified Reconnaissance Drought Index) is then compared with Modified Standardized Precipitation Index (MSPI), as based on the Standardized Precipitation Index (SPI) and the Reconnaissance Drought Index (RDI), involving a well-known statistical technique named Principal Component Analysis (PCA). Gorganroud basin, Iran, is taken as a Case Study. According to the obtained results, the new MRDI and also MSPI multivariate indices have shown to be of more accurate results and are also easier to use than the SPI and RDI univariant indices. A comparison of MRDI and MSPI results, as based upon the non-parametric Kolmogorov– Smirnov test in Gorganroud basin, has revealed that, there is no significant difference between them with their behavior similar in more than 90% of the cases. An evaluation and verification of the results of the study needs to be repeated in other representative basins. | ||
کلیدواژهها [English] | ||
Drought, Time Multivariate Index, Principal component analysis | ||
مراجع | ||
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