نوع مقاله : پژوهشی

نویسندگان

1 دانشجوی دکتری ژئومورفولوژی، دانشگاه شهیدبهشتی، تهران، ایران

2 دکتری ژئومورفولوژی، دانشگاه تبریز، تبریز، ایران

3 دانشیار گروه ژئومورفولوژی، دانشگاه شهید بهشتی، تهران، ایران

چکیده

حوضه­ آبریز دربادام در شمال استان خراسان رضوی واقع شده است. در این پژوهش جهت بررسی تغییرات زمانی و مکانی بستر رودخانه در منطقه‌ی مورد مطالعه از تصاویر ماهواره­ای لندست ( سال­های 2010 تا 2021 ) استفاده گردید و تغییرات رودخانه در دوره‌ی زمانی یازده سال مورد تجزیه و تحلیل قرار گرفت. تصاویر ماهواره­ای لندست در سه محیط CAD Auto ، ENVI ، Arc Map با توجه به اهداف تحقیق مورد تجزیه و تحلیل قرار گرفته است. بر این اساس بررسی تغییرات الگوی رودخانه در سه بخش شامل بخش اول (زیرحوضه سمت راست)، بخش دوم (زیرحوضه سمت چپ) و بخش سوم (بخش انتهایی) مورد مطالعه قرار گرفت. بر اساس نتایج بدست آمده از این تحقیق، میانگین زوایای مرکزی قوس‌ها در دوره‌ی زمانی یازده سال، در بخش اول تغییری در الگوی رودخانه رخ نداده اما در بخش دوم و سوم الگوی رودخانه از الگوی مئاندری توسعه­نیافته به الگوی رودخانه مئاندری توسعه‌یافته تبدیل شده است. میانگین ضرایب خمیدگی نیز در هر سه بخش نشان­دهنده‌ی الگوی پیچانرودی است.لایه ­های زمین­شناسی موجود در این منطقه که عمدتاً دارای لیتولوژی مقاوم هستند، ویژگی شیب و توپوگرافی که باعث شده قسمت اعظم این حوضه دارای ساختار کوهستانی باشد، باعث شده است جابجایی عرضی مئاندر در منطقه‌ی مورد مطالعه کم باشد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Investigation of changes in the meandering pattern of Darbadam river, Quchan city

نویسندگان [English]

  • Zahra Yunesian 1
  • fariba hemmati 2
  • Mohammad Mahdi Hossein Zade 3

1 , PhD student in Geomorphology, Shahid Beheshti University, Tehran, Iran.

2 PhD in Geomorphology, University of Tabriz, Tabriz, Iran

3 Associate Professor, Department of Geomorphology, Shahid Beheshti University, Tehran, Iran

چکیده [English]

are connected at the end of the basin and form the Darbadam River. According to the results obtained for the central angle, in the first part between 2010 and 2021, the Meandri River pattern was developed and there was no change in the pattern class, but in the second and third parts in 2010, the river pattern is not developed meandering, which in 2021 has become the developed meandering river pattern



Based on the average curvature coefficients in all three sections studied, the Darbadam River has a meandering pattern. Due to the characteristics of the region, such as the presence of resistant rock layers, the high slope of the region and also the mountainous topography, has led to low transverse displacement of meander in the region. However, in some parts of the river, due to human activities, including land use change, vegetation degradation and overgrazing, there has been a change in the river pattern.

کلیدواژه‌ها [English]

  • Meandering pattern- Curvature coefficient-
  • Central angle
  • - Darbadam River
  • -
  • Northeast Iran
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