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عملکرد توابع انتقالی طیفی پارامتریک و نقطهای برای برآورد منحنی مشخصه رطوبتی خاک | ||
تحقیقات آب و خاک ایران | ||
مقاله 12، دوره 45، شماره 4، دی 1393، صفحه 475-490 اصل مقاله (1.73 M) | ||
نوع مقاله: مقاله پژوهشی | ||
شناسه دیجیتال (DOI): 10.22059/ijswr.2014.52600 | ||
نویسندگان | ||
ابراهیم بابائیان1؛ مهدی همایی* 2؛ علی اکبر نوروزی3 | ||
1دانشجوی دکتری گروه خاکشناسی دانشکدة کشاورزی دانشگاه تربیتمدرس تهران | ||
2استاد گروه خاکشناسی دانشکدة کشاورزی دانشگاه تربیتمدرس تهران | ||
3استادیار پژوهشکدة حفاظت خاک و آبخیزداری تهران | ||
چکیده | ||
اندازهگیری مستقیم ویژگیهای هیدرولیکی خاک معمولاً هزینهبر و وقتگیر است. تلاش فراوانی صورت گرفته تا بتوان از طریق توابع انتقالی خاک (PTFs) و به کمک اطلاعات زودیافت به ویژگیهای هیدرولیکی خاک دست یافت. هدف این پژوهش ارزیابی عملکرد پارامتریک و نقطهای توابع انتقالی طیفی (STFs) و PTFها در برآورد پارامترهای مدلهای منحنی رطوبتی ونگنوختن و بروکزـ کوری بود. همچنین، به منظور مقایسة کارایی متغیرهای طیفی و متغیرهای مبنایی خاک، عملکرد توابع انتقالی طیفی و توابع انتقالی خاکهای منطقه نسبت به مهمترین توابع انتقالی برخی خاکهای جهان بررسی شد. بدین منظور، تعداد 174 نمونه خاک گردآوری و منحنیهای طیفی آنها در گسترة 350 تا 2500 نانومتر با استفاده از دستگاه اسپکترورادیومتر زمینی اندازهگیری شد. برخی ویژگیهای فیزیکی خاک همراه مقادیر رطوبت در پتانسیلهای ماتریک معین اندازهگیری و به روش حداقل مربعات خطا و پارامترهای مدلهای رطوبتی ونگنوختن و بروکزـ کوری محاسبه شد. با استفاده از روش رگرسیون مرحلهای چندگانه، توابع انتقالی خاک و توابع انتقالی طیفی پارامتریک و نقطهای اشتقاق یافت. نتایج نشان داد STFs و PTFs خاکهای منطقه در هر دو رویکرد نقطهای و پارامتریک نسبت به PTFsهای دیگر مناطق جهان (متوسط RMSR برابر 100/0)، برای پیشبینی نگهداشت آب در خاک، دقت بیشتری (متوسط RMSR برابر 029/0) دارند. دقت برآورد رطوبت خاک توسط مدل ونگنوختن (متوسط RMSR برابر 034/0) نسبت به مدل بروکزـ کوری (متوسط RMSR برابر 041/0) بیشتر بود. به طور کلی، STF و PTFهای اشتقاقیافته دقت تقریباً برابری داشتند؛ با این تفاوت که در مکشهای متوسط و زیاد STFها برآوردی بهتر ارائه کردند. | ||
کلیدواژهها | ||
بازتاب طیفی خاک؛ توابع انتقالی خاک؛ توابع انتقالی طیفی | ||
مراجع | ||
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