文章基本信息

标题：Recuperação e mapeamento da concentração de clorofila-a a partir de imagens do Sentinel-2 em um rio urbano na região semiárida do Brasil
其他标题：Retrieval and mapping of chlorophyll-a concentration from Sentinel-2 images in an urban river in the semiarid region of Brazil
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作者：Pereira, Alessandro Rhadamek Alves ; Lopes, João Batista ; Espindola, Giovana Mira de 等
期刊名称：Revista Ambiente & Água
印刷版ISSN：1980-993X
出版年度：2020
卷号：15
期号：2
页码：1-13
DOI：10.4136/ambi-agua.2488
出版社：Instituto de Pesquisas Ambientais em Bacias Hidrográficas
摘要：Recently, the Poti river mouth region has experienced environmental impacts that resulted in a change of landscape in its dry season, highlighting the eutrophication and proliferation of phytoplankton, algae, cyanobacteria and aquatic plants. Considering the aspects related to water-quality monitoring in the semiarid region of Brazil from remote sensing, this study aimed to evaluate the performance of Sentinel-2A satellite data in the retrieval of chlorophyll-a concentration in Poti River in Teresina, Piaui, Brazil. The chlorophyll-a concentration retrieval and mapping methodology involved the study of the water surface reflectance in Sentinel-2A images and their correlation with the chlorophyll-a data collected in situ during the years 2016 and 2017. The results generated by the Chl-1, Ha et al. (2017), Chl-2, Page et al. (2018), and Chl-3, Kuhn et al. (2019) equations show the need for calibrating the algorithms used for the Poti River water components. However, the empirical algorithm Chl-2 shows a correlation has been established to identify the spatiotemporal variation of chlorophyll-a concentration along the Poti River broadly and not punctually. The spatial distribution of this pigment in maps derived from Sentinel-2A is consistent with the pattern of occurrence determined by the in situ data. Therefore, the MSI sensor proved to be a tool suitable for the retrieval and monitoring of chlorophyll-a concentration along the Poti River.
关键词：qualidade da água;rio Poti;sensoriamento remoto
其他关键词：Poti river;remote sensing;water quality