آشکارسازی مسیرهای طوفان گرد و غبار با استفاده از مدل‌های عددی و تصاویر ماهواره‌ای (مطالعه موردی: استان اصفهان)

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانش‌آموخته دکترای بیابان‌زدایی، گروه احیاء مناطق خشک و کوهستانی، دانشکده منابع طبیعی، دانشگاه تهران، کرج، ایران

2 استاد، گروه احیاء مناطق خشک و کوهستانی، دانشکده منابع طبیعی، دانشگاه تهران، کرج، ایران

3 استادیار، گروه احیاء مناطق خشک و کوهستانی، دانشکده منابع طبیعی، دانشگاه تهران، کرج، ایران

4 دانشیار، پژوهشکده حفاطت خاک و آبخیزداری، سازمان تحقیقات، آموزش و ترویج کشاورزی، تهران، ایران

چکیده

یکی از مهمترین چالش‌های زیست محیطی سال‌های اخیر در منطقه خاور‌میانه و ایران، رخداد گرد و غبار می‌باشد. پایش و کنترل کیفیت ذرات گرد و غبار، در سطح وسیع و با روش‌هایی که از سرعت و دقت بیشتر و هزینه کمتری برخودار باشند، از اهمیت فراوانی برخودار است. این پژوهش بر آن است که با استفاده از بارزسازی و تحلیل عددی نسبت به تعیین منابع ریزگردها و چگونگی حرکت آنها بر فراز ایران و استان اصفهان در می 2013 بپردازد. در این پژوهش از مدل‌های HYSPLIT، NAAPS،COAMPS  و تصاویر MODIS استفاده شده است. بارزسازی گرد و غبار بر اساس خصوصیات مربوط به دمای درخشندگی در محدوده مادون قرمز حرارتی سنجنده مادیس ارائه و آستانه‌های دمایی به‌منظور تفکیک این رخداد از اراضی بیابان و ابرها تعیین گردید. به‌منظور ردیابی مسیر حرکت ذرات گرد و غبار از مدل HYSPLIT استفاده شد. براساس نتایج بدست‌آمده از پردازش تصاویر و خروجی مدل شمال عربستان و مسیر جنوب‌غربی- شمال‌شرقی به‌ترتیب منشأ و مسیر اصلی ورود گرد و غبار برای اصفهان محسوب می‌شوند. نتایج مدل HYSPLIT با نتایج مدل COAMPS و NAAPS از لحاظ عمق اپتیکی گرد و غبار و غلظت گرد و غبار سطحی و نحوه حرکت توده غلظت مقایسه و تأیید شده است. بارزسازی تصاویر ماهواره‌ای MODIS نیز ایجاد توده گرد و غبار و حرکت آن را به سمت مرکز ایران و استان اصفهان تصدیق می‌کند.

کلیدواژه‌ها


عنوان مقاله [English]

Detection of dust storm paths using numerical models and satellite images (Case Study: Isfahan Province)

نویسندگان [English]

  • Mehdi jafari 1
  • Gholamreza Zehtabian 2
  • Hasan Ahmadi 3
  • Tayebeh mesbahzadeh 3
  • Ali Akbar Norouzi 4
1 Department of Rehabilitation of Arid and Mountainous Regions, Faculty of Natural Resources, University of Tehran, Karaj, Iran
2 Professor, Department of Rehabilitation of Arid and Mountainous Regions, Faculty of Natural Resources, University of Tehran, Karaj, Iran
3 Professor, Department of Rehabilitation of Arid and Mountainous Regions, Faculty of Natural Resources, University of Tehran, Karaj, Iran
4 Assistant Professor, Soil Conservation and Watershed Management, Agriculture Research, Education and Extension organization (AREEO), Tehran, Iran
چکیده [English]

Dust pollution is one of the most important environmental challenges in recent years in the Middle East and Iran. It is important to monitor and control the quality of dust particles in a wider range using the methods that are more cost effective and less costly. The present study aims to use numerical detection and analysis to determine the resources of dusts and the route over Iran and Isfahan province in May 2013. In this research, HYSPLIT, NAAPS, COAMPS models and MODIS images were used. The detection of dust was determined based on the characteristics of the brightness temperature in the infrared thermal range of the Modis sensor and the temperature thresholds for distinguishing this event from desert lands and clouds. The HYSPLIT model was used to track the movement path of dust particles. Based on the results obtained from image processing and model output, North of Saudi Arabia and Southwest – Northeast direction are respectively the origin and main route of dust entry to Isfahan. The results of HYSPLIT model were compared with the results of the COAMPS and NAAPS models for the optical dust depth and surface dust concentration and the mass flow rate. The detection of the MODIS satellite images also acknowledges the creation of dust and moving it towards the center of Iran and the province of Isfahan.

کلیدواژه‌ها [English]

  • Dust
  • Isfahan
  • MODIS
  • HYSPLIT
  • NAAPS
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