بررسی توزیع مکانی و زمانی گردوغبار در ایران

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشگاه حکیم سبزواری

چکیده

یکی از مهم‌ترین چالش‌های محیط‌زیستی به وجود آمده در منطقه خاورمیانه و ایران در سال‌های اخیر پدیده گردوغبار است. طوفان گردوغبار، فرایند پیچیده‌ای است که تحت تاثیر فعل‌وانفعالات سامانه‌های جوی بوده و اساسا شرایطی مانند سرعت زیاد باد، خاک برهنه و هوای خشک سبب ایجاد آن می‌شود. بنابراین، با توجه به مطالب فوق در این پژوهش برای بررسی فصلی وقوع گردوغبار در ایران از داده‌های مجموع تعداد دفعات وقوع گردوغبار در دوره آماری 1990 تا 2012 استفاده شد. همچنین برای بررسی و پهنه‌بندی توزیع زمانی و مکانی وقوع گردوغبار در منطقه‌ی مذکور از روش وزن‌دهی معکوس فاصله (IDW) در محیط نرم‌افزار ARCGIS 10.3 استفاده شد. نتایج نشان داد که مناطق جنوب و جنوب‌شرقی و جنوب‌غربی یا به عبارتی نیمه‌ جنوبی کشور با توجه به موقعیت نسبی خود مانند عرض جغرافیایی پایین و قرار گرفتن مناطق بیابانی در این مناطق در تمام فصول سال دارای گردوغبار هستند. حتی در فصل زمستان که پدیده گردوغبار در تمام کشور به حداقل خود می‌رسد در جنوب شرق کشور که شامل مناطق جنوبی استان سیستان و بلوچستان است گردوغبار با شدت‌های متفاوت وجود دارد.

کلیدواژه‌ها

عنوان مقاله [English]

Spatial and Temporal Distribution of Dust in Iran

نویسندگان [English]

  • Mahdi Asadi
  • Mokhtar Karami
Hakim Sabzevari University
چکیده [English]

 
In recent years the phenomenon of dust is one of the most important environmental challenges exist in the Middle East and Iran. Dust storm is a complex process influenced by interactions atmospheric system and basically conditions such as wind speeds, bare soil and dry weather is causing it. Considering the above, in this study to examine the seasonal occurrence of dust in the dust of the data, the total numbers of occurrences in the period 1990 to 2012 were used. As well as to review and zoning temporal and spatial distribution of dust in the region of inverse distance weighting (IDW) in ARCGIS 10.3 software was used. The results showed that the south and southeast, and southwest of the southern half of the country or in other words according to their relative positions, such as Latitude down and to wilderness areas in the region in all seasons with dust. Even in winter, the phenomenon is minimized dust across the country In the South East of the country, including the southern part of Sistan-Baluchistan province with varying intensities there is dust.

کلیدواژه‌ها [English]

  • Iran
  • Dust
  • Temporal and spatial distribution
  • Inverse distance weighting method Geographic information system

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پژوهش های محیط زیست
دوره 10، شماره 19
شهریور 1398
صفحه 293-300

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