Detection of mucilage phenomenon in the Sea of Marmara by using multi-scale satellite data

Aylin Tuzcu Kokal*, Nazlı Olgun, Nebiye Musaoğlu

*Bu çalışma için yazışmadan sorumlu yazar

Araştırma sonucu: ???type-name???Makalebilirkişi

16 Atıf (Scopus)

Özet

Marine mucilage outbreaks occurred in the Sea of Marmara in 2021 which severely affected the marine ecosystem. The thick mucilage blankets with different colors became a public concern due to the toxicity potential related to pathogens that accumulate in prolonged presence of mucilage. The mucilage-covered areas in the Sea of Marmara detected by remote sensing data acquired in 2021 were previously reported. However, the areal extents and spectral characteristics of the different colored mucilage types remain unknown. This study presents the spectral characteristics of different types of mucilage in the İzmit Bay in the Sea of Marmara by using medium- (Sentinel-2) and high-spatial resolution (Worldview-3) satellite images. Also, the sea surface temperatures (SST) were studied in relation with the mucilage formation from January 2015 to August 2021 by using NOAA data. Two multispectral satellite sensors Sentinel-2 and Worldview-3 were studied for their potential for mucilage mapping and characterization in the sub-region İzmit Bay. Support vector machine (SVM) classifier was used to detect three different types of mucilage with distinguishable spectral differences in infrared region ranging from 725 to 950 nm. Three different types of mucilage were characterized based on color and texture including (a) the white mucilage aggregates with dispersed patterns which are likely freshly formed, (b) the yellow mucilage accumulations in the coasts that are wind/current transported, and (c) the brown mucilage accumulations that are probably the most-aged. Our results showed that brown mucilage and white mucilage showed similar reflectance values between 425 and 545 nm region, while yellow mucilage showed higher and more distinctive spectral reflectance than white and brown mucilages. The NOAA data showed that average surface water temperature has been increased over the years from 2015 (16.1 °C) to 2021 (17.6 °C). This increase trend in SSTs points out a likely relation with the mucilage formation and hence may suggest a potential of repeating mucilage events in the near future. This study provides a practical methodology for monitoring, classification, and efficient site selection for mucilage cleaning areas in the Sea of Marmara.

Orijinal dilİngilizce
Makale numarası585
DergiEnvironmental Monitoring and Assessment
Hacim194
Basın numarası8
DOI'lar
Yayın durumuYayınlandı - Ağu 2022

Bibliyografik not

Publisher Copyright:
© 2022, The Author(s), under exclusive licence to Springer Nature Switzerland AG.

Finansman

The authors would like to acknowledge to Istanbul Technical University (ITU) Center for Satellite Communication and Remote Sensing (CSCRS) and Maxar for providing Worldview-3 satellite image and also to the financial support of Istanbul Technical University Scientific Research Projects Office (BAP) under project number MDK-2021-43054 and the Scientific and Technological Research Council of Turkey under project number 121G142.

FinansörlerFinansör numarası
Center for Satellite Communication and Remote Sensing
Istanbul Technical University Scientific Research Projects Office
Türkiye Bilimsel ve Teknolojik Araştırma Kurumu121G142
Istanbul Teknik Üniversitesi
Bilimsel Araştırma Projeleri Birimi, İstanbul Teknik ÜniversitesiMDK-2021-43054

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