ارزیابی زمانی و مکانی پایگاه‌های جهانی بارش (حوضه‌های آبریز درجه دو ایران)

نوع مقاله : مقاله پژوهشی

نویسندگان

گروه علوم و مهندسی آب، دانشکده کشاورزی و محیط زیست، دانشگاه اراک، اراک، ایران.

10.22059/jwim.2023.359108.1076

چکیده

در این پژوهش هدف ارزیابی پایگاه داده­های بارش با مقادیر مشاهداتی به‌صورت زمانی (ماهانه و فصلی) و مکانی (دو حالت نقطه­ای (40 ایستگاه سینوپتیک) و سطحی (30 حوضه آبریز درجه دو و چهار اقلیم))، در کشور به‌عنوان منطقه مطالعاتی می­باشد. بدین منظور ابتدا داده­های مشاهداتی (100 ایستگاه در مقیاس روزانه) و پایگاه­های جهانی بارش شامل ERA5، MRRRA2، GLDAS و TERRA (با تفکیک مکانی مختلف در مقیاس ماهانه) طی دوره زمانی 1398-1366 گرد­آوری و استخراج گردید. سپس براساس شاخص خشکی، طبقه­بندی اقلیمی ایستگاه­ها و حوضه­ها انجام شده است. ارزیابی دقت پایگاه‌ها با استفاده از معیارهای ضریب همبستگی (R)، میانگین خطای اریبی (MBE) و مجذور میانگین مربع خطا استانداردشده (NRMSE) استفاده شده است. نتایج معیارهای در بارش ایستگاهی نشان داد که پایگاه TERRA در همه فصول به‌جز تابستان و در اقلیم­های فراخشک، خشک و نیمه‌خشک، با متوسط 70 درصد ضریب همبستگی بالاتر از 5/0 (R) و میزان خطای 90 درصد کم‌تر از 5/0 (NRMSE) نسبت به بقیه­ها پایگاه­ها و در اقلیم مرطوب پایگاه ERA5 عملکرد بهتری را از خود نشان داد. در بارش حوضه­ای نیز نشان داد به‌ترتیب پایگاه TERRA در اقلیم فرا­خشک، پایگاه­های ERA5، MRRRA2، GLDAS  و TERRA در اقلیم خشک، پایگاه­های ERA5 و TERRA در اقلیم نیمه‌خشک و پایگاه‌های ERA5، TERRA و MERRA2 در اقلیم مرطوب با متوسط 80 درصد ضریب همبستگی بالاتر از 5/0 و میزان خطای 70 درصد کم‌تر از 5/0 کارایی مناسب‌تری را نشان دادند. به‌طور کلی پایگاه TERRA در حالت نقطه­ای، سطحی و اقلیمی از عملکرد خوبی برخوردار بوده است که می‌توان گفت به‌علت دقت مکانی بالای آن بوده باشد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Temporal and Spatial Evaluation of Global Precipitation Products (Iran's Sub Basins)

نویسندگان [English]

  • Fatemeh Moghaddasi
  • mahnoosh moghaddasi
  • Mehdi Mohammadi
Department of Water Science and Engineering, Faculty of Agriculture and Environment, Arak University, Arak, Iran.
چکیده [English]

The goal of this study, is to evaluate temporal (monthly) and spatial (in both point scale (40 synoptic stations) and region scale (30 river basins and four climate zones) global propitiation products with observational values in Iran as case study. To this end, first observational data (100 synoptic on a daily scale) and global precipitation products including ERA5, MRRRA2, GLDAS and TERRA (with different spatial resolution on a monthly scale) during the period of 1366-1398, were collected and extracted. Then, the stations and river basins were classified based on aridity index. Statistics criteria's such as coefficient of determination (R2), normalized square root mean square error (NRMSE) and mean oblique error (MBE) were used to compare the data products with observational data. The results of the criteria in point scale showed that the TERRA products in all seasons except summer and in the Hyper-arid, Arid and Semi-arid climate, with an average of 70 precent correlation coefficient higher than 0.5 (R) and 90 precent error rate less than 0.5 (NRMASE) showed a better performance than the rest of the products and in the Humid climate zones of the ERA5 product. In region scale, it also showed that TERRA product in Hyper-arid, ERA5, MRRRA2, GLDAS and TERRA products in Arid climate zones, ERA5 and TERRA products in Semi-arid climate and ERA5, TERRA and MERRA2 showed more suitable efficiency in Humid climate with an average of 80% correlation coefficient higher than 0.5 and 70 precent error rate less than 0.5. Consequently, the TERRA and MERRA2 product in point, region and climate has had good performance.

کلیدواژه‌ها [English]

  • Basin
  • Climate
  • ERA5
  • GLDAS
  • Global precipitation products
  • MERRA2
  • TERRA

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مدیریت آب و آبیاری
دوره 13، شماره 4
دی 1402
صفحه 889-908

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