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• W3133438305 abstract "The Guanting Reservoir supplied drinking water to Beijing until 1997, following which the water quality of the reservoir deteriorated. The chlorophyll-a concentration (Cchl-a) of water is an important indicator of eutrophication. Therefore, changes in the Cchl-a of the Guanting Reservoir should be monitored and analysed. For more than 30 years, the monitoring of Cchl-a in inland waterbodies has only been possible using the Landsat 5 Thematic Mapper (TM), Landsat 7 Enhanced Thematic Mapper (ETM), and Landsat 8 Operational Land Imager (OLI). However, there are data consistency problems in monitoring Cchl-a using these sensors. To address this issue, this study utilized inter-sensor normalization models of the different sensors and a unified Cchl-a estimation model for Landsat series data with a long time span. After inter-sensor normalization, the mean relative error (MRE) of remote sensing reflectance (Rrs) between OLI and TM/ETM+ was corrected to 1–5%. The unified model of Cchl-a estimation employed the normalized ratio index of blue RB and near-infrared RNIR remote sensing reflectance: (RNIR – RB): (RNIR + RB). The MRE for estimating Cchl-a was 25.7% and the root-mean-square error (RMSE) was 5.65 mg m–3. The Cchl-a of the Guanting Reservoir was then estimated for years between 1985 and 2019. During this time, Cchl-a had a distinct seasonal distribution trend; the annual changes go through four stages, and each period shows different change characteristics. This study is the first to systematically understand the history of chlorophyll-a changes in the Guanting Reservoir over the past 30 years and provides references data for its eutrophication process and management." @default.
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• W3133438305 date "2021-02-21" @default.
• W3133438305 modified "2023-10-14" @default.
• W3133438305 title "Tracking historical chlorophyll-<i>a</i> change in the guanting reservoir, Northern China, based on landsat series inter-sensor normalization" @default.
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• W3133438305 doi "https://doi.org/10.1080/01431161.2021.1875149" @default.
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