تحلیل نقش کانون های گرد و غبار داخلی در ایجاد شرایط بحرانی در اهواز با تاکید بر کانون جنوب شرق

نوع مقاله : مقاله پژوهشی

نویسندگان

1 استادیار پژوهش، بخش تحقیقات بیابان، موسسه تحقیقات جنگلها و مراتع کشور، سازمان تحقیقات، آموزش و ترویج کشاورزی، تهران، ایران

2 دانشیار پژوهش، بخش تحقیقات بیابان، موسسه تحقیقات جنگلها و مراتع کشور، سازمان تحقیقات، آموزش و ترویج کشاورزی، تهران، ایران

چکیده

DOR:98.1000/1735-0859.1397.16.157.32.2.1578.1602

خوزستان بزرگترین کانون گردوغبار داخلی کشور است. گردوغبار اهواز، پدیده‌ای تازه نیست؛ آنچه آن را به معضل محیط­زیستی تبدیل کرده، افزایش رخداد شرایط بحرانی از منابع گردوغبار داخلی است. به منظور شناسایی نقش کانون ریزگرد داخلی بر ایجاد شرایط بحرانی، داده‌های مربوط به سمت و سرعت باد و کمترین میزان دید افقی روزانه ایستگاه سینوپتیک اهواز در دوره آماری 1987-2016 استخراج و برای شناسایی توزیع مکانی و زمانی سهم سمت و سرعت باد، از هشت جهت اصلی و فرعی، گلباد و گلغبار سالانه بلندمدت و فصلی ترسیم شد. برای شناسایی نقش کانون‌های گردوغبار داخلی و خارجی رخدادهای با منشاء داخلی یعنی کانون‌های اطراف ایستگاه ؛ کد 07 و خارجی یعنی خارج از ایستگاه کد 06، استخراج و گلغبار فصلی آنها ترسیم شد. رخدادهای گردوغبار با منشاء داخلی بر روی لایه مربوط به کانون‌های گردوغبار داخلی و ماسه‌های روان قرار گرفت؛ نتایج نشان داد جهت باد غالب غربی و سپس شمال غرب بوده و گلغبار کلی از آن تبعیت می‌کند. گلغبار فصلی با منابع خارجی از گلغبار کلی تبعیت می‌کند؛ اما گلغبار با منابع داخلی در فصول مختلف تغییر کرده و جهت جنوب و جنوب شرق در فصل سرد سال غالب می‌شود. توزیع ماهانه و سالانه دیدهای بحرانی از سمت جنوب و جنوب شرق استخراج و نتایج نشان داد؛ در فصل سرد فراوانی آنها بیشتر است. شاخص خشکسالیSPI  فصل سرد محاسبه و ارتباط آن با دیدهای بحرانی نشان داد که رخداد آنها از خشکسالی فصل زمستان تبعیت می‌کند. که باید اقدامات حفاظتی مناسب در بخش‌های مختلف کانون، هورها، دیمزارها، مراتع فقیر و ... انجام شود.
 
 

کلیدواژه‌ها

عنوان مقاله [English]

Analysis of the role of internal dust sources in creating critical conditions in Ahvaz with an emphasis on the southeastern area

نویسندگان [English]

  • F. Dargahian1 1
  • S. Lotfinasabasl 1
  • M. Khosroshahi 2
چکیده [English]

Khuzestan is the largest source of internal dust in the country. Ahvaz dust is not a new phenomenon, and what made it to a major environmental problem, is the increase in occurrence of critical conditions due to internal sources of dust. In order to identify the role of the internal recoil center on the creation of critical conditions, daily data on wind direction and wind speed and the minimum horizontal visibility of Ahwaz synoptic station during the 1987-2016 statistical period were extracted, and for the identification of spatial and temporal distribution of the relative contribution of wind speed and wind direction, long-term annual and seasonal wind rose and Golghobar was drawn from the eight primary and secondary directions.. To identify the role of internal and external dust sources, events associated with internal origins, i.e. the sources around the station (Code 07) and outside of the station (Code 06) were maped and their seasonal Golghobar were drawn. Dust events with internal origin overlaid on the layer of internal dust sources and flowing sands. The results showed that the dominant wind direction is west and then North West and general Golghobar follows it. Seasonal Golghobar with external sources comply with general Golghobar but Golghobars with domestic resources change which prevails to South and South East direction in the cold season. Monthly and annual distribution of critical views of the South and South-East were extracted and the results revealed their higher frequency in the cold season. SPI drought index was calculated for the cold season and its relationship with critical views showed demonstrated that their occurrence follows the winter drought. Suitable protective measures should be taken in different parts of the recoil centers, marshes, drylands, grasslands, poor rangelands, etc.
 
 

کلیدواژه‌ها [English]

  • internal and external sources of dust
  • golghobar
  • winter drought
  • Ahwaz

مراجع

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فایل ها

سابقه مقاله

  • تاریخ دریافت: 17 خرداد 1396
  • تاریخ بازنگری: 25 اسفند 1397
  • تاریخ پذیرش: 20 فروردین 1397

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