مطالعه نرخ فرونشست و توزیع اندازه ذرات گردوغبار با توجه به خصوصیات اراضی در کانون فوق بحرانی هویزه-خرمشهر

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه علوم و مهندسی خاک، دانشکده کشاورزی، دانشگاه شهید چمران اهواز، اهواز، ایران

2 گروه علوم و مهندسی خاک، دانشکده کشاورزی، دانشگاه شهید چمران اهواز، اهواز، ایران.

چکیده

طوفان­های گردوغبار را می­توان یکی از مهم‌ترین دلایل آلودگی هوا در مناطق دارای کانون­های ریزگرد و مناطق همجوار آن­ها دانست. این پژوهش با هدف بررسی تغییرات نرخ فرونشست و الگوی توزیع اندازه ذرات گردوغبار با توجه به عوامل اقلیمی مؤثر در اطراف کانون غبار هویزه انجام شد. بدین منظور ۳۰ ایستگاه برای نصب تله­های رسوب‌گیر تیله­ای در شهرهای هویزه و سوسنگرد انتخاب و هرماه پس از جمع‌آوری نمونه‌های غبار، نرخ فرونشست و الگوی توزیع اندازه ذرات گردوغبار تعیین شد. نتایج نرخ فرونشست ذرات گردوغبار نشان داد که بیشترین و کمترین مقدار فرونشست ماهانه گردوغبار به ترتیب در اردیبهشت و اسفندماه رخ‌ داده است. نتایج توزیع اندازه ذرات نشان داد که بیش از ۸۰ درصد ذرات گردوغبار ته‌نشست­شده را اجزای سیلت تشکیل می­دهد. تشابه در بافت ذرات گردوغبار با بافت خاک کانون غبار هویزه- خرمشهر و از طرفی با توجه به الگوی جهت باد منطقه مورد مطالعه، می­توان منشأ این طوفان­های گردوغبار را از مناطق همجوار استان خوزستان و احتمالاً از کانون غبار هویزه و تالاب­های خشک‌شده در مرز ایران و عراق دانست.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Study of Deposition Rate and Dust Particle Size Distribution with Attention to Soil Properties in Hoveizeh-Khorramshahr Supercritical Source

نویسندگان [English]

  • Reza Aminfar 1
  • Ahmad Landi 2
  • Saeid Hojati 1
1 Department of Soil Science and Engineering, Faculty of Agriculture, Shahid Chamran University of Ahvaz, Ahvaz, Iran
2 Department of Soil Science and Engineering, Faculty of Agriculture, Shahid Chamran University of Ahvaz, Ahvaz, Iran
چکیده [English]

Dust storms can be one of the most important causes of air pollution in areas with dust sources and also in nearby areas. The purpose of this study was to investigate the changes rate of deposition and the pattern of particle size distribution of dust due to climatic factors around the dust. For this purpose, 30 stations were selected to install marine sediment Marbles traps in the city of Hoveizeh and Susangerd. Each month after collecting the dust samples, the rate of deposition and particle size distribution pattern of the dust were determined. The results of the dust particle deposition showed that the highest and the lowest monthly dust deposition occurred in May and March, respectively. The particle size distribution results showed that silt components form more than 80% of the deposited dust particles. Regarding the similarity of the texture of dust particles with the soil texture of the Hoveizeh-Khorramshahr dust source and also the land features and wind direction pattern of the study area, the origin of these dust storms is known to be from the neighboring areas of Khuzestan province, and probably from the Hoveizeh dust source and the dried wetlands in Iran-Iraq border.

کلیدواژه‌ها [English]

  • Deposition
  • Dust
  • Origin
  • Particle size
  • Temporal variation

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تحقیقات آب و خاک ایران
دوره 51، شماره 6
شهریور 1399
صفحه 1555-1565

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