آشکار سازی تجربی آب های کدر و شفاف با استفاده از تصاویر ماهواره سنتینل-2 (مطالعه نمونه ای آبگیر سد سفید رود)

نوع مقاله : مقاله پژوهشی

نویسندگان

• معصومه رسولیان ¹
• طاهر صفرراد ²
• محمد اکبری نسب ³
• نادیا طالب پور ¹

¹ دانشجوی کارشناسی ارشد فیزیک دریا، دانشکده علوم دریایی، دانشگاه مازندران، بابلسر

² استادیار اقلیم شناسی، دانشکدة علوم انسانی و اجتماعی، دانشگاه مازندران، بابلسر

³ استادیار گروه فیزیک دریا، دانشکده علوم دریایی، دانشگاه مازندران، بابلسر

چکیده

افزایش حجم ورودی آب رودخانه به سد در فصول پرآبی سبب گل‌آلودگی در قسمت‌های ورودی آب به سد می‌گردد. تأثیر آب شفاف و کدر روی سهم پریفیتون ها که در تغذیه آبزیان و همچنین در تصفیه آب‌های آلوده نقش مهمی دارند، از اهمیت ویژه‌ای برخوردار است به گونه‌ای که در آب‌های شفاف فراوانی بیشتری نسبت به آب‌های کدر دارند. در این مقاله با استفاده از تصاویر سنجنده سنتینل-2 و بهره‌گیری از ویژگیهای رفتار طیفی آب کدر و شفاف و تاکید بر کمیت‌های آماری به آشکارسازی آنها در سد سفیدرود طی دو فصل بهار (17 فروردین 1396) و تابستان (22 شهریور 1396) پرداخته میشود. در این راستا، پس از اعمال پیش‌پردازش‌های مورد نیاز (تصحیح هندسی و رادیومتریکی)، با بررسی منحنی رفتار طیفی این دو پدیده و همچنین شاخصOIF ، ترکیب‌های رنگی بهینه تشخیص داده شدند. براین اساس، مناسبترین ترکیب رنگی حاوی بیشترین حجم اطلاعات برای فصل بهار، ترکیب رنگی (a4،8،8) و برای فصل تابستان، ترکیب رنگی (8،1،a8) مشخص گردید. از طرف دیگر، با استفاده از مطالعه رفتار طیفی آب کدر و شفاف، در محدوده طول‌موج‌های 4/0 تا 87/0 میکرومتر (باندهای 1 تا a8)، این دو پدیده به خوبی قابل تفکیک از هم و سایر پدیدها هستند بنابراین، شاخص NDVI که تفاضل استاندارد شده محدوده طیفی مادون قرمز نزدیک(باند 8) و قرمز مرئی(باند 4) را بررسی می کند جهت آشکارسازی آب کدر و شفاف مورد توجه قرار گرفت و درنهایت از طریق اعمال آستانه هایی روی آن، آب کدر و شفاف از هم متمایز شدند.

کلیدواژه‌ها

• آب کدر و شفاف
• شاخص فاکتور بهینه
• شاخص NDVI
• سنجنده سنتینل-2
• سد سفید رود

20.1001.1.20086377.1398.12.43.8.0

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عنوان مقاله [English]

Empirical Detection of Turbid and Clear Water Using Space-Borne Sentinel-2 Case Study: Sefidrud Dam

نویسندگان [English]

• Masoomeh Rasoolian ¹
• Taher Safarrad ²
• Mohammad Akbarinasab ³
• Nadia Talebpoor ¹

¹ MSc student of marine physics, Faculty of Marine Sciences, Mazandaran University, Babolsar

² Assistant Professor of Climatology, Faculty of Humanities and Social Sciences, Mazandaran University, Babolsar

³ Assistant Professor of Marine Physics, Faculty of Marine Sciences, Mazandaran University, Babolsar

چکیده [English]

The effects of clear and turbid water on the contribution of prefitons, which play an important role in aquatic nutrition and in the treatment of contaminated waters, are very important in a way that is more abundant in clear waters than opaque waters. In this paper, using Sentinel-2 measuring images and using spectral properties of opaque and clear water, and emphasizing statistical quantities, they are to be detected in the Sefidrud Dam during two seasons (March 27 , 2017) and summer (September 13, 2017). In this regard, after applying the required preprocesses (geometric and radiometer correction), by examining the spectral behavior curve of these two phenomena as well as the OIF index, optimal color combinations were detected by the test and error method. Accordingly, the most suitable color combination contains the largest amount of information for the spring, the color combination (a4,8,8) and for the summer, the color combination (8.1, a8) was determined. On the other hand, using the spectral-velocity study of opaque and clear water, within the range of 4/0 – 87/0 μm (bands 1 through a8), these two phenomena are well-differentiated from each other and other phenomena. Therefore, the NDVI index, which examines the standardized difference of the near-infrared spectral range (band 8) and visible red (band 4), was considered for revealing cloudy and transparent water, and eventually, by applying thresholds on it, Cloudy and clear water was distinguished from each other.

کلیدواژه‌ها [English]

• Turbid and clear water
• Optimum Factor Index
• NDVI
• sentinel-2 satellite
• Sefidrud Dam

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