:: دوره 10، شماره 2 - ( 8-1401 ) ::
جلد 10 شماره 2 صفحات 62-39 برگشت به فهرست نسخه ها
بررسی مقایسه ای شاخص های آب مستخرج از تصاویر ماهواره‌ای به منظور پایش تغییرات سطح پهنه‌های آبی با کمک سامانه گوگل ارث انجین (مطالعه موردی: تالاب میقان اراک)
مرجان فرجی ، باقر فاطمی*
دانشگاه اصفهان
چکیده:   (1523 مشاهده)
تالاب‌ها زیست‌بوم آبی پویا و پیچیده‌ای هستند که نقش مهمی در بقای گونه‌های بسیار زیادی از گیاهان و جانوران وابسته به خود ایفا می‌کنند. در این پژوهش با استفاده از شش شاخص NDVI، NDWI، MNDWI، AWEIsh، AWEInsh  و WRI به بررسی تغییرات تالاب میقان اراک در بازه زمانی 1985 تا 2020 پرداخته‌شده است. علاوه بر آن مساحت‌های پهنه‌های آبی حاصل‌شده توسط شاخص‌ها در دوران خشک‌سالی و ترسالی با یکدیگر مقایسه شده و همبستگی بین تصویر حاصل‌شده از هر شاخص تحلیل و ارزیابی‌شده است. با توجه به اینکه تالاب موردمطالعه دارای عمق آب بسیار کم و حاوی آب شور است، توانایی شاخص‌های آبی در استخراج پهنه‌ آبی این تالاب مورد بررسی قرارگرفته و با نتایج طبقه‌بندی روش ماشین بردار پشتیبان مقایسه شده است. نتایج حاکی از آن است که شاخص‌ AWEInsh  در هنگام خشک‌سالی و کاهش حجم و سطح آب قادر به استخراج رضایت‌بخش و دقیق پهنه‌های آبی نمی‌باشند. شاخص‌های WRI و MNDWI با صحت کلی 95.97 و 98.52 برای تصویر دوره خشک‌سالی 99.04 و 99.57 در هنگام پر آبی تالاب بهترین شاخص‏ها برای تعیین پهنه‌ی آبی می‏باشند. عنوان یک نتیجه کلی می­توان گفت اطمینان کردن به نتایج یک شاخص در دوران خشک‌سالی برای بررسی پهنه­های آبی درست نیست. از آنجایی که در بررسی­های زمانمند ترکیبی از سال‏های کم آب و پرآب وجود دارد، لذا توصیه جدی این است که در مطالعات مشابه از چند شاخص برای بررسی پهنه­های آبی به‌طور هم‌زمان استفاده شود.
واژه‌های کلیدی: تشخیص تغییرات، تالاب میقان، شاخص آب، سنجش از دور، لندست
متن کامل [PDF 2451 kb]   (379 دریافت)    
نوع مطالعه: كاربردي | موضوع مقاله: سنجش از دور
دریافت: 1400/11/23 | پذیرش: 1401/4/7 | انتشار: 1401/8/10
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دوره 10، شماره 2 - ( 8-1401 ) برگشت به فهرست نسخه ها