برآورد کمی تپه‌های ماسه‌ای با استفاده از تصویربرداری با پهپاد در منطقه فراخشک سیستان
محورهای موضوعی : منابع طبیعی و مدیریت زیست محیطی
سعید پورمرتضی
1
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حمید غلامی
2
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,
علیرضا راشکی
3
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نوازاله مرادی
4
1 - دانشجوی دکتری
2 - گروه مهندسی منابع طبیعی - دانشگاه هرمزگان
3 - گروه مدیریت مناطق خشک و بیابانی، دانشکده منابع طبیعی و محیط زیست، دانشگاه فردوسی مشهد
4 - گروه مهندسی منابع طبیعی دانشگاه هرمزگان
کلید واژه: تپه ماسه‌ای, دشت سیستان, پهپاد, کمی‌سازی,
چکیده مقاله :
دشت سیستان با داشتن اقلیم فراخشک تبخیر و تعرق بالا بارندگی کم و وزش بادهای 120 روزه زمینه لازم جهت فرسایش و رسوبات بادی را فراهم کرده است با توجه به شاخص بودن تپه‌های ماسه‌ای در منطقه ضرورت کمی سازی تپه‌ها جهت به دست آوردن حجم و مساحت سه‌بعدی که بستر ساز برنامه‌ریزی پروژه‌ای و مدیریت کنترل رسوبات است از اهداف این پژوهش است. پس از شناسایی و تصویربرداری با پهپاد منطقه مطالعاتی مدل ارتفاعی رقومی با وضوح 4 سانتی‌متر و تصویر آرتوفتوموزاییک با وضوح 1 سانتی‌متر به منظور استخراج اطلاعات کمی تپه‌ها تهیه گردید با کمک تصویر آرتوفتوموزاییک و مدل ارتفاعی رقومی محدوده تپه‌ها مشخص و حجم‌ها و مساحت سه‌بعدی به دست آمد جهت بررسی بیشتر اجزای تپه (بادخیز و باد پناه) در بررسی متقابل مدل ارتفاعی رقومی با درصد شیب، درصد زبری و جهت شیب نشان داد که در بادخیز و بادپناه بیشترین میانگین رسوب در شیب 70-100 درصد وجود دارد بیشترین میانگین رسوب در بادخیز در زبری 0-20 درصد و بیشترین در بادپناه در زبری 70-100 درصد وجود دارد در بررسی جهت شیب مشخص شد که بیشترین میانگین رسوب در بادخیز در جهت شمال‌شرقی و در بادپناه در جهت شرقی می‌باشد.
Sand dunes are one of the most important facies of wind erosion. Our understanding of the complex interactions of sand dunes is often limited by the lack of accurate morphological data. The erosion and sedimentation process is very important and there is currently a lack of field data for executive projects, study plans and validation of erosion and sedimentation models. Images of the study area were taken using a Phantom 4 Pro UAV at an altitude of 60 meters on September 22, 2019. This type of UAV, which is small and light, with its 20-megapixel camera and GPS, can provide high quality images. After separating the dunes, a three-dimensional area in terms of square meters and volume in terms of cubic meters were obtained. And the product of a small amount of bulk density of soil in terms of cubic centimeters and the volume of dunes in terms of cubic meters The weight of the dunes was obtained in terms of tons.In the study, the slope percentage and sediment height were determined based on the windward part and the wind shelter of the dune The highest wind area was slope 10-20% And the maximum sediment is in the slope of 70-100% And in the wind shelter, the maximum area was on a slope of 30-50% And the highest sediment was determined in the slope of 70-100% .
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