دوفصلنامه رسوب شناسی کاربردی

دوفصلنامه رسوب شناسی کاربردی

بررسی الگوی توزیع ذرات رسوبی تحت تاثیر تغییرات شدت جریان­ باد و آب در منطقه صالح ­آباد (شمال شرق ایران)، با اشاره بر اثرات زیست ­محیطی

نویسندگان
1 دانش‌آموخته کارشناسی‌ارشد، گروه زمین‌شناسی، دانشکده علوم‌پایه، دانشگاه فردوسی مشهد، مشهد، ایران
2 دانش‌آموخته دکترا، گروه زمین‌شناسی، دانشکده علوم‌پایه، دانشگاه بوعلی‌سینا، همدان، ایران
3 استاد گروه زمین‌شناسی، دانشکده علوم‌پایه، دانشگاه فردوسی مشهد، مشهد، ایران
4 استادیار گروه زمین‌شناسی، دانشکده علوم‌پایه، دانشگاه فردوسی مشهد، مشهد، ایران
چکیده
ریزگردها به عنوان یک پدیده طبیعی می­توانند تأثیرات قابل­توجهی بر سیستم زمین، محیط­زیست و زندگی انسان داشته باشند. به منظور بررسی پارامترهای رسوب­شناسی ریزگردهای منطقه صالح­آباد، 7 دستگاه نمونه­گیر ته­نشینی در شهرستان صالح­آباد و 6 روستای اطراف آن نصب شد و گردوغبار در طی یکسال جمع­آوری و مورد آنالیز دانه­سنجی لیزری قرار گرفت. طبقه­بندی ذرات با استفاده از نمودار فولک (1974) تجمع ذرات در محدوده سیلت را نشان می­دهد. با توجه به ریز بودن اندازه ذرات، ریزگردها از منابع با فاصله زیاد منشا گرفته­اند. الگوی بایمدال و پلی­مدال در نمودارهای توزیع ذرات به وجود منابع مختلف ریزگرد با توجه به جهت بادهای مختلف و شدت آن در طی سال اشاره می­نماید. داده­های حاصل از گلبادهای منطقه بیانگر وجود دو جهت باد اصلی در منطقه مورد مطالعه است. علاوه بر این، وجود جریان­های آبی نیز می­تواند باعث پلی­مدال شدن نمودارها گردد. فراوانی ذرات ریزتر از 10 میکرون در نمونه­های گرد و غبار پتانسیل ایجاد مشکلات زیست­محیطی را به همراه دارد که می­توانند به بروز بیماری­های تنفسی بیانجامند.
کلیدواژه‌ها

عنوان مقاله English

Distribution pattern of sediment particles under the influence of wind and water flow intensity in the Saleh-abad region - northeast Iran, with reference to environmental impacts

نویسندگان English

A. Darrudi 1
E. Pasban 2
M. H. Mahmudy Gharaie 3
A. Karimian Torghabeh 4
1 M. Sc. (graduated), Dept., of Geology, Faculty of Science, Ferdowsi University, Mashhad, Iran
2 Ph. D. (graduated), Dept., of Geology, Faculty of Science, Bu Ali Sina University, Hamedan, Iran
3 Prof., Dept., of Geology, Faculty of Science, Ferdowsi University, Mashhad, Iran
4 Assist. Prof., Dept., of Geology, Faculty of Science, Ferdowsi University, Mashhad, Iran
چکیده English

Dust storms, as a natural phenomenon, can exert considerable effects on the Earth system, the environment, and human life. To investigate the sedimentological characteristics of dust in the Salehabad region, seven depositional samplers were installed across Salehabad County and six adjacent villages. Dust samples were collected over one year duration and analyzed using laser granulometry. Based on Folk’s (1974) classification diagram, most particles were found to fall within the silt size range. The fine grain size indicates that the dust likely originates from remote sources. Bimodal and polymodal patterns in particle size distribution suggest the influence of multiple dust sources, which vary with wind direction and intensity throughout the year. Wind rose data for the area reveal two predominant wind directions. Additionally, water flows may also contribute to the polymodal nature of the particle size distributions. The abundance of particles smaller than 10 microns in the dust samples highlights their potential to cause environmental and health issues, particularly respiratory disease.

کلیدواژه‌ها English

Dust storm
Salehabad
Wind erosion
Particle origin
Laser granulometry
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  • تاریخ دریافت 16 فروردین 1404
  • تاریخ بازنگری 21 اردیبهشت 1404
  • تاریخ پذیرش 25 خرداد 1404