بررسی پویایی زمانی و مکانی پوشش اراضی تالاب پريشان با استفاده از مدل درخت تصمیم و پردازش تصاوير ماهواره¬اي
الموضوعات :گل آفرین زارع 1 , بهرام ملک محمدی 2 , حمیدرضا جعفری 3 , احمدرضا یاوری 4 , احمد نوحه گر 5
1 - دانشجوی دکتری برنامهریزی محیطزیست ، دانشکده محیطزیست دانشگاه تهران.
2 - دانشیار دانشکده محیطزیست دانشگاه تهران. *(مسوول مکاتبات)
3 - استاد دانشکده محیطزیست دانشگاه تهران.
4 - استاد دانشکده محیطزیست دانشگاه تهران.
5 - استاد دانشکده محیطزیست دانشگاه تهران.
الکلمات المفتاحية: تصاویر ماهواره¬ای, پوشش اراضی, روش درخت تصمیم, تالاب پریشان.,
ملخص المقالة :
زمینه و هدف: تالابها به عنوان یکی از مهمترین انواع اکوسیستمهای جهان به شدت در حال تهدید میباشند. تالاب پریشان علاوه بر اینکه جزء مناطق حفاظتشده ایران قرار دارد بلکه به عنوان تالاب بینالمللی و نیز ذخیرهگاه زیستکره نیز شناخته شده است. درک روند تغییرات این تالاب میتواند برای بهبود وضعیت آتی آن بسیار مفید باشد. از این رو هدف پژوهش حاضر پايش تغييرات پهنه آبی تالاب پريشان در بازه زمانی 30 ساله میباشد. روش بررسی: در راستای هدف تحقیق تصاوير ماهواره¬ لندست براي چهار دوره زماني 13۶۶، 1377، 13۸۶ و ۱۳۹۵ به همراه سایر دادههای مورد نیاز تهیه گرديد. با انجام پردازشهای مورد نیاز در نرم¬افزار ENVI 4.7، نقشه¬هاي پوشش اراضي تالاب پریشان با بهرهگیری از شاخص تفاضلي نرمال شده پوشش گياهي و شاخص تفاضلي نرمال شده آب در قالب روش درخت تصمیم در سه طبقه پهنه آبی، پوشش گیاهی و سایر اراضی استخراج شد. یافتهها: نتایج نشان داد که در بازه بلندمدت سیساله (۱۹۸۷ تا ۲۰۱۶) از مساحت ۱۹۶۳ هکتاری پهنه آبی تالاب پریشان تنها ۱۳ هکتار در انتهای بازه باقیمانده است. پایش تغییرات نشان میدهد که پهنه آبی تالاب پریشان نسبت به سال 1366 حدود 1950، نسب به سال 1377 حدود 3605 و نسب به سال 1386 حدود 2272 هکتار کاهش مساحت داشته است. بحث و نتیجهگیری: استفاده از دادههای ماهوارهای و تکنیکهای سنجش از راه دور به همراه مدل طبقهبندی درخت تصمیم حاکی از قابلیت روش مورد استفاده برای شناسایی و طبقهبندی پوشش اراضی در محدودههای تالابی که پوشش گیاهی و آب درهم تنیدهاند، میباشد.
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