ارزیابی پایگاه داده های جهانی بارش برای استفاده در مدلهای فیزیکی، مطالعه موردی :حوزه آبریز کارون

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد رشته مهندسی منابع آب/ پردیس ابوریحان، دانشگاه تهران.

2 دانشیار / گروه مهندسی منابع آب، پردیس ابوریحان، دانشگاه تهران.

چکیده

به دلیل عدم پوشش مکانی و زمانی مناسب ایستگاه‌های اندازه‌گیری بارش در سطح کشور نیازمند داده‌های شبکه‌بندی شده با قدرت تفکیک مکانی و زمانی مناسبی می‌باشد به همین دلیل ازپایگاه‌های جهانی بارش برای مطالعات منابع آبی بهره برده می‌شود. در سال‌های اخیر تعداد این پایگاه‌ها رو به افزایش بوده و در مطالعات منابع آبی بسیاری از این داده‌ها استفاده شده است. در این پژوهش به ارزیابی پایگاه داده‌های بارش با داده‌های مشاهداتی به صورت سلول به سلول و میانگین حوضه در حوزه آبریز کارون پرداخته شده است. پایگاه داده‌های مورد استفاده در این پژوهش عبارتند از؛ PERSIANN، PERSIANN-CDR، APHRODITE،TRMM-3B42 RT، CHIRPS V2.0، ERRA-INTERIM. ارزیابی‌ها در مقیاس روزانه‌ و برای دوره آماری 2003-2013 انجام پذیرفته است. با توجه به نتایج شاخص‌های آماری همچون ضریب تببین و NRMSE، پایگاه داده APHRODITE و ERRA-INTERIM در مقایسه با دیگر پایگاه‌ داده‌ها عملکرد بهتری از خود نشان داده‌اند. همچنین با توجه به شاخص‌های جدول طبقه‌بندی شده دو پایگاه داده APHRODITE و ERRA-INTERIM از کارایی مناسبی برخوردار می‌باشد. نتایج نشان داد که علی رغم این‌که دو پایگاه داده APHRODITE و ERRA-INTERIM از دقت مناسبی در تمامی ارزیابی‌ها برخوردار هستند ولی در تشخیص عدم وقوع بارش عملکرد ضعیفی داشتند. با توجه به ارزیابی‌های صورت گرفته می‌توان‌ از پایگاه داده APHRODITE به عنوان جایگزین برای داده‌های مشاهداتی استفاده کرد، در بین داده-های ماهواره‌ای نیز برای حوزه کارون TRMM از عملکرد بهتری برخوردار بوده و با واسنجی و تصحیح اریبی با استفاده از داده‌های مشاهداتی می‌توان از این ماهواره در مطالعات منابع آبی برای حوزه مورد نظر بهره برد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Evaluation of the global rainfall datasets for use in physical models, Case study: Karoun Basin

نویسندگان [English]

  • Akbar Rahmati 1
  • Alireza Massah Bavani 2
1 M.S. Graduate in Water Resources Engineering, Department of Irrigation and Drainage Engineering, University of Tehran, Tehran, Iran.
2 Associate Prof., Department of Irrigation and Drainage Engineering, Aburaihan Campus, University of Tehran, Tehran, Iran
چکیده [English]

Due to the lack of proper spatio-temporal coverage of precipitation measuring stations in the country, there is a need for gridded data with proper spatial and temporal resolution. For this reason, global rainfall centers were used in water resources studies. In recent years, the number of these gridded datasets has been increasing and many of these datasets have been used in water resources studies. In this research, rainfall datasets have been evaluated in both pixel scale and mean basin with observation data in the Karoon basin. The datasets used in this study are PERSIANN, PERSIANN-CDR, APHRODITE, TRMM-3B42 RT, CHIRPS V2.0, ERRA-INTERIM. Evaluations were made on a daily scale and for the period of 2003-2013. According to the results of statistical indices such as coefficient of determination and NRMSE, the APHRODITE and ERRA-INTERIM datasets have shown better performance than others. Also, according to the contingency table indicators, the APHRODITE and ERRA-INTERIM datasets have good performance. The results showed that despite the fact that the APHRODITE and ERRA-INTERIM datasets have the proper accuracy in all evaluations, they have poor performance in detecting non-occurrence of rainfall. According to the evaluations, the APHRODITE dataset can be used as an alternative to observational data and among satellite datasets, Among the satellite datasets, TRMM has better performance, and with calibration and bias correction using observational data, this satellite can be used in water resources studies for the target area.

کلیدواژه‌ها [English]

  • : Karoon basin
  • global precipitation datasets
  • gridded data
  • satellite datasets
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