تحلیل تاثیر خصوصیات باد بر وضعیت دینامیکی و مورفولوژیکی تپه های ماسه ای، مطالعه موردی: ریگزارهای سواحل جنوبی ایران

نوع مقاله : پژوهشی

نویسندگان

1 استاد ژئومورفولوژی، دانشگاه تهران، تهران، ایران

2 دکتری ژئومورفولوژی، دانشگاه تهران، تهران، ایران

چکیده

موقعیت جغرافیایی ایران سبب شده است تا در بخش‌های زیادی از آن، دارای انواع تپه‌های ماسه‌ای باشیم. از جمله مناطقی که دارای تراکم و تنوع زیادی از انواع تپه‌های ماسه‌ای است، سواحل جنوبی ایران است. با توجه به اینکه تپه‌های ماسه‌ای دارای دینامیک فعالی هستند و می‌توانند نواحی انسانی را تهدید کنند، در این تحقیق به ارزیابی وضعیت دینامیکی و مورفولوژی تپه‌های ماسه‌ای سواحل جنوبی ایران پرداخته شده است. در این تحقیق از تصاویر ماهواره‌ لندست، تصاویر گوگل ارث و اطلاعات آماری مربوط ایستگاه‌های هواشناسی منطقه منطقه به‌عنوان مهم‌ترین داده‌های تحقیق استفاده شده است. مهم‌ترین ابزارهای تحقیق، ArcGIS، WRplot و Sandrose graph بوده است. در این تحقیق ابتدا وضعیت مورفومتری و مورفولوژی تپه‌های ماسه‌ای بررسی شده است و سپس به ارزیابی خصوصیات بادهای منطقه و ارتباط آن با دینامیک و مورفولوزی تپه‌های ماسه‌ای منطقه پرداخته شده است. بر اساس نتایج حاصله، در سواحل جنوبی ایران حدود 2750 کیلومترمربع تپه ماسه‌ای در اشکال مختلف وجود دارد که پوشش ماسه‌ای کم ضخامت، پوشش ماسه‌ای متوسط ضخامت و عرضی مرکب به ترتیب با 8/59، 9/10 و 3/7 درصد از کل مساحت ریگزارهای منطقه، دارای بیش‌ترین وسعت هستند. همچنین تحت تاثیر بادهای منطقه، بخش زیادی از تپه های ماسه ای جنوب ایران دارای وضعیت فعالی هستند و با توجه به اینکه ضریب همبستگی بین شاخص‌های سرعت باد و DPt به فعالیت تپه‌های ماسه‌ای منطقه در فصل بهار به ترتیب 514/0 و 612/0 بوده است، بنابراین می‌توان گفت که بیش‌ترین میزان فعالیت تپه‌های ماسه‌ای مربوط به فصل بهار است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Analysis of the impact of wind characteristics on the dynamic and morphological state of sand dunes (Case study: sand dunes of the southern coast of Iran)

نویسندگان [English]

  • Mehran Maghsoudi 1
  • Hamid Ganjaeian 2
1 Professor in Geomorphology, University of Tehran, Tehran, Iran
2 Ph. D of geomorphology, University of Tehran, Tehran, Iran
چکیده [English]

Considering that sand dunes have active dynamics and can threaten human areas, this research has evaluated the dynamic status and morphology of sand dunes on the southern coast of Iran. In this research, Landsat satellite images, Google Earth images and statistical information related to the meteorological stations of the region have been used as the most important research data. The most important research tools have been ArcGIS, WRplot and Sandrose graph. In this research, first the morphometric status and morphology of the sand dunes have been investigated and then the characteristics of the winds in the region and their relationship with the dynamics and morphology of the sand dunes in the region have been evaluated. According to the results, there are about 2750 square kilometers of sand dunes in different forms on the southern coast of Iran, of which thin sand cover, medium sand cover and composite width have the largest area with 59.8, 10.9 and 7.3 percent of the total area of sand dunes in the region, respectively. Also, under the influence of the winds of the region, a large part of the sand dunes of southern Iran are in an active state, and considering that the correlation coefficient between the wind speed and DPt indices to the activity of the sand dunes in the region in the spring was 0.514 and 0.612, respectively, it can be said that the highest level of sand dune activity is related to the spring season.

کلیدواژه‌ها [English]

  • Sand dunes
  • Sand dune dynamics
  • Sand dune morphology
  • Southern coasts of Iran

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  • تاریخ دریافت: 25 تیر 1404
  • تاریخ بازنگری: 07 مهر 1404
  • تاریخ پذیرش: 08 مهر 1404

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