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بررسی سناریوهای مختلف وضوح طیفی در برآورد ویژگی های هیدرولیکی خاک | ||
تحقیقات آب و خاک ایران | ||
مقاله 16، دوره 46، شماره 3، مهر 1394، صفحه 529-544 اصل مقاله (2.39 M) | ||
نوع مقاله: مقاله پژوهشی | ||
شناسه دیجیتال (DOI): 10.22059/ijswr.2015.56742 | ||
نویسندگان | ||
ابراهیم بابائیان1؛ مهدی همایی* 2؛ علی اکبر نوروزی3 | ||
1دانشجوی دکتری گروه خاکشناسی دانشکدة کشاورزی دانشگاه تربیت مدرس تهران | ||
2استاد گروه خاک شناسی دانشکدة کشاورزی دانشگاه تربیت مدرس تهران | ||
3استادیار سنجش از دور پژوهشکدة حفاظت خاک و آبخیزداری تهران | ||
چکیده | ||
توابع انتقالی خاک (PTFs) روشی غیر مستقیم برای برآورد ویژگیهای هیدرولیکی خاک به کمک اطلاعات زودیافت خاک است که غالباً شامل بافت، مادة آلی، و جرم ویژة ظاهری خاک هستند. در چند دهة گذشته، مطالعاتی در زمینة برآورد مشخصههای مبنایی از روی اطلاعات طیفی خاک در گسترة مرئی و مادون قرمز نزدیک (350ـ 2500 نانومتر) انجام شده است. برآورد ویژگیهای هیدرولیکی خاک به کمک رفتارسنجی طیفی خاک رویکرد نوینی است که چندان مد نظر قرار نگرفته است. در این پژوهش، قابلیت استفاده از توابع انتقالی طیفی (STFs) در قالب چهار سناریو شامل دادههای طیفی در مقیاس آزمایشگاهی (سناریوی 1)، دادههای طیفی در مقیاس سنجندة Sentinel-2 (سناریوی 2)، دادههای طیفی در مقیاس سنجندة ابرطیفی EnMap (سناریوی 3)، و مقایسة آنها با نتایجِ کاربرد توابع Rosetta و HYPRES (سناریوی 4) در مقیاسهای نقطهای و واحد نقشة خاک به منظور برآورد پارامترهای مدل معلمـ ونگنوختن بررسی شد. به منظور اشتقاق STFها، روش رگرسیون مرحلهای چندگانه و روش بوتاستراپ به کار رفت. بهترین نتایج برای برآورد پارامترهای مدل معلمـ ونگنوختن بهازای سناریوی 1 و 2 (متوسط برابر 382/0، 029/0، 061/0، 634/0 برای ، ، ، ) به دست آمد. همچنین، استفاده از سه سناریوی طیفی به بالاترین دقت در پیشبینی منحنی مشخصة رطوبتی (متوسط RMSR برابر 0337/0 سانتیمتر مکعب بر سانتیمتر مکعب) و هدایت هیدرولیکی خاک (متوسط RMSR برابر 015/1 سانتیمتر بر روز) در مقایسه با سناریوی چهارم انجامید. این نتایج نشان میدهد استفاده از اطلاعات با وضوح طیفی مختلف میتواند روشی غیر مستقیم و سریع و کمهزینه در برآورد ویژگیهای هیدرولیکی خاک، بهویژه در مقیاس بزرگ، باشد. | ||
کلیدواژهها | ||
بازتاب طیفی؛ توابع انتقالی خاک؛ توابع انتقالی طیفی؛ منحنی مشخصة رطوبتی؛ معلمـ ونگنوختن | ||
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