بررسی مورفولوژی تپه های ماسه ای و انطباق آن با داده های باد در منطقه ریگ زرین

نوع مقاله : مقاله پژوهشی

نویسندگان

1 استادیار گروه جغرافیا، دانشگاه یزد، ایران

2 استاد گروه جغرافیا، دانشگاه یزد، ایران

3 کارشناس ارشد ژئومورفولوژی، گروه جغرافیا، دانشگاه یزد، ایران

چکیده

هدف از این پژوهش، بررسی مورفولوژی تپه­های ماسه­ای واقع در ریگ زرین در شمال­ شرق شهر یزد و انطباق آن با داده­های باد منطقه است. برای انجام این پژوهش، پس از ترسیم نقشه انواع اشکال تپه­های ماسه­ای، مورفولوژی آن‌ها با جهت باد غالب ایستگاه‌های پیرامون ریگ تطبیق داده ­شد. نتایج نشان داد که تپه­­های ریگ زرین، مورفولوژی متنوعی داشته و بیشتر انواع تپه­ها شامل تپه­های ساده، سیف، برخان، هرم، تپه­های مرکب و پیچیده را شامل می­شود. تنوع و پیچیدگی این تپه­ها نشان­دهنده تغییرپذیری شدید بادها به شکل فصلی، سالانه و دوره­ای است و با داده­های باد هیچ­کدام از ایستگاه‌های پیرامون ریگ مطابقت ندارد. درواقع، به دلیل اختلاف ارتفاع کویرهای ایران مرکزی با مناطق کوهستانی بالادست، مناطق کویری ایران اغلب به‌عنوان مراکز کم­فشار حرارتی در سطح زمین عمل می­کنند. تجمع حجم زیادی از ماسه در بخش جنوب شرقی ریگ و شکل­گیری تپه­های ستاره­ای مرتفع در آن نشان‌دهنده دخالت بادهای غالب شمال غربی در فصل گرم، بادهای فرعی جنوب­شرقی منطقه و هم­افزایی نیروی باد همگرای محلی است.

کلیدواژه‌ها


عنوان مقاله [English]

Morphological study of the sand dunes in Zarrin Erg and its adaptation to the regional wind data

نویسندگان [English]

  • Mohamad Sharifi Paichoon 1
  • Kamal Omidvar 2
  • Zeynab Miri 3
1 Assistant Prof. of Geomorphology, Department of Geography, Yazd University
2 Professor of Climatologylogy, Department of Geography, Yazd University
3 M Sc. of Geomorphology, Department of Geography, Yazd University
چکیده [English]

The purpose of this study is to investigate the morphology of the sand dunes located in Zarin Erg in the northwest of the city of Yazd and its accordance with the wind data provided by the surrounding synoptic stations. The results showed that the sand dunes have different morphologies, including simple dunes, seif, barchans, star, and complex dunes. The complexity and variety of the dunes indicates the drastic variation of wind regimes seasonally, annually as well as periodically. Also, they do not match with any wind data of the surrounding synoptic stations. The presence of barchans in the quadrilateral erg is indicative of directional winds. The local winds are the main cause of the formation of these dunes and their morphology. Indeed, due to the difference of height between the central Iranian playas and upstream mountainous, the playas of this part of Iran often serve as thermal low-pressure centers on the Earth surface, and their marginal sand dunes are always moved by these winds. The accumulation of large amounts of sand in the southeastern part of the erg and the formation of star dunes with a height of more than 200 meters are signs of prevailing north-west winds in the warm season and the severe winds of the southeast in the cold season. These winds reinforce the power of local convergent winds.

کلیدواژه‌ها [English]

  • Zarrin Erg
  • morphology
  • Barchan
  • Sand dune
  • Wind
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