Tidal flats are essential habitats for a wide variety of plants and animals along the coast, contributing significantly to biodiversity preservation. Despite efforts to employ remote sensing technology for mapping these areas, misidentification remains a persistent issue. Within the context of tidal flat mapping, one of the primary challenges lies in distinguishing between tidal flats and turbid water bodies. This is primarily attributed to the high sediment content in turbid water bodies, which renders their spectral characteristics similar to those of tidal flats, consequently leading to confusion. To this end, this study developed a novel Tidal Flats-Water Difference Index (TWDI) with time series Sentinel-2 to accurately map tidal flats in China for the year 2020. The index demonstrates robust performance in distinguishing between tidal flats and water bodies, particularly in turbid water conditions. It reduces the likelihood of misclassifying water bodies as tidal flats, thus enhancing the accuracy of tidal flats mapping. Based on this index, we generated Tidal Flats Map of China at 10 m (TFMC) in 2020 based on the GEE. With validation from 10,234 samples, the TFMC map attained an overall accuracy (OA) and F1 score of 0.97. Based on our calculations, the total area of tidal flats in China was 9195.80 km, with Jiangsu Province accounting the largest area at the provincial level (2467.71 km). This study is the first attempt to address the issue of misclassification of turbid water bodies as tidal flats. TWDI can serve as the spectral index in tidal flats mapping or as input features for training classification models of coastal wetland. The TFMC map can serve as foundational data to promote the protection of tidal flats and the sustainable development of coastal wetland ecosystems.
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http://dx.doi.org/10.1016/j.scitotenv.2024.178037 | DOI Listing |
Sci Total Environ
December 2024
Beijing Laboratory of Water Resources Security, Capital Normal University, Beijing, China.
Mar Pollut Bull
December 2024
Department of Geography and the Environment, Villanova University, 800 Lancaster Avenue, Villanova, PA 19085, USA. Electronic address:
Sci Rep
November 2024
Nanjing Geological Survey Center, China Geological Survey, Nanjing, 210016, China.
Sci Total Environ
December 2024
Department of Environmental Sciences, Federal University of São Paulo (UNIFESP), Diadema 09972270, Brazil.
A significant limitation in current coastal pollution research is that microplastics (<5 mm) comprise only a fraction of all anthropogenic microparticles (AMP, <5 mm) scale residues. Comprehensive AMP assessments, including those comprising semisynthetic, and modified natural compositions, are lacking. For instance, the accumulation of AMP in different coastal morphological features within a depositional system remains poorly known, fueling long-lasting debates about the distribution process of microparticles.
View Article and Find Full Text PDFEnviron Sci Technol
November 2024
Key Laboratory of Marine Ecosystem Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China.
Photovoltaic power is a rapidly growing component of the renewable energy sector. Photovoltaic power stations (PVPSs) on coastal tidal flats offer benefits, but the lack of information on the effects of PVPSs on benthic ecosystems and sediment carbon storage can hamper the development of eco-friendly renewable energy. We sampled the macrobenthos and sediment cores at a PVPS on a coastal tidal flat in eastern China.
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