شناسایی مناطق مستعد وقوع غلظت های بالای گردوغبار و بررسی همدیدی آن در حوضه جازموریان

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری بیابان‌زدایی، دانشکده کویرشناسی، دانشگاه سمنان، سمنان، ایران

2 نویسنده مسئول، دانشیار، دانشکده کویرشناسی، دانشگاه سمنان، سمنان، ایران

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

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

5 دانشیار، دانشکده کویرشناسی، دانشگاه سمنان، سمنان، ایران

چکیده

الگوی توزیع مکانی گردوغبار متغیر مهمی در درک حمل و نقل گرد و غبار و اجرای استراتژی های کنترل مناسب است. مطالعه حاضر با استفاده از شبیه سازی با مدل NMMB / BSC-Dust دربازه سه ساله (از سال 2014-2016) ، توزیع فضایی گرد و غبار در حوضه جازموریان را مورد بررسی قرار داده است. بدین منظور چند واقعه گردوغبار در منطقه براساس میدان دید و کدهای گردوغبار انتخاب و مسیر انتقال گردوغبار در آن بازه تا 72 ساعت رصد گردید. در نهایت با روی هم گذاری تصاویر حاصل از مدل در این بازه های انتخابی با استفاده از روش فازی در محیط ArcGis نقشه مناطق مستعد وقوع غلظت بالای گردوغبار در حوضه تهیه گردید. برای هر تاریخ انتخابی ، از تصویر سنجنده SMAP برای اندازه گیری رطوبت خاک سطح زمین استفاده گردید. و بادهای منطقه ای با کمک مدل NCEP/NCARمورد بررسی قرار گرفت. نتایج این تحقیق نشان داد که بخش مرکزی حوضه جازموریان که تالاب جازموریان در آن واقع شده است بیشترین غلظت گرد و غبار در دوره مورد مطالعه را دارا بوده است.

کلیدواژه‌ها


عنوان مقاله [English]

Identification of areas susceptible to high dust concentrations and their relationship with synoptic factors in Jazmourian basin

نویسندگان [English]

  • zahra saieedifar 1
  • mohamad rahimi 2
  • سکینه لطفی 3
  • Mohammad Khosroshahi 4
  • mohamad yazdani 5
1 semnan university
2 semnan university
3 / موسسه تحقیقات چنگلها/عضو هیات علمی
4 Desert Research Institute, a member of the faculty of the Department of Forests and Rangelands Research Agency, Agricultural Extension and Education, Tehran, Iran
5 semnan university
چکیده [English]

The main aim of this study is identification of areas susceptible to high dust concentrations, investigating a number of factors affecting its formation (including wetland drying and soil moisture) and their coherence with synoptic factors (including climate maps and regional wind). The spatial distribution pattern of dust is an important variable in understanding dust transport and implementing appropriate control strategies. The present study investigates the spatial distribution of dust in the Jazmourian Basin using a simulation with the NMMB / BSC-Dust model over a three-year period (from 2014 to 2016). For this purpose, several dust events in the Jazmurian basin were selected based on the visibility and dust codes, and the dust transfer route was monitored for up to 72 hours for this date. Finally, by overlaying the model images in these selective intervals, by using the fuzzy method in ArcGIS environment, the map of areas disposed to high dust concentration in the basin were prepared. For each selected date, the SMAP satellite image was used to measure soil moisture. And zonal winds were investigated using the NCEP/NCAR model. The results of this study showed that the central part of the Jazmurian basin, which is the location of the Jazmurian wetland, had the highest dust concentration during the study period. In addition, a synoptic study of dust sustainable areas showed that in the dates of the dust occurrence, low-pressure and high wind speeds centers formed on the surface of the basin.

کلیدواژه‌ها [English]

  • dust concentration
  • NMMB / BSC-Dust model
  • zonal winds
  • soil moisture
  • wetland surface
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