A satellite-based investigation into the algae bloom variability in large water supply urban reservoirs during COVID-19 lockdown
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Le résumé fourni par la source
Abstract Here we report the first case study of the significant algae blooming in large reservoirs in relation to the COVID-19 lockdown in Sao Paulo, Brazil. Chlorophyll-a (Chl-a) and phycocyanin (PC) concentrations were analyzed in the Guarapiranga and Billings reservoirs, which supply daily water use for over 20 million people and receives treated wastewater. We employed field-calibrated Sentinel 2 MSI and Landsat 8 OLI images to map the spatial patterns of Chl-aand PC over the two period: before (April, August and October 2019) and more than a month after the lockdown in Sao Paulo due to the rapid spread of the COVID-19 in Brazil (April 2020). We found a significant increase in algae blooming (both Chl-a and PC) in both reservoirs in April 2020, compared to the same month of 2019. We show that the episodic algae blooming is strongly related to the increased inflows of the residential wastewater from the surrounding watersheds, because the household water use has increased ~3.2% in April 2020, while the runoff into the reservoirs driven by the rainfall was much lower in 2020 compared to the previous year for the same month. In the case of Guarapiranga Reservoir, PC increased nearly 500% in April 2020 compared to April 2019. Given the importance of Billings and Guarapiranga reservoirs for the water supply of the Metropolitan Region of Sao Paulo (MRSP), the abrupt occurrence of cyanobacteria blooms related to the state’s lockdown should be considered a major concern for public and environmental health of the region. Although several environmental consequences have been reported due to the COVID-19 worldwide, this study is the first to report the impact of COVID-19 on the trophic state in the tropical reservoirs.
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Le contrôle bibliographique ouvert
DOI retrouvé dans Crossref DOI retrouvé ; titre concordant.
- Titre Crossref
- A satellite-based investigation into the algae bloom variability in large water supply urban reservoirs during COVID-19 lockdown
- Date Crossref
- 09/02/2021
- Éditeur
- Research Square Platform LLC
- Type
- posted-content
Ce recoupement confirme des métadonnées liées au DOI. Il ne confirme ni la méthode ni les conclusions de l’étude, et il ne compte pas comme une seconde source scientifique indépendante.
Où se fait cette recherche
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Universidade Estadual de Campinas (UNICAMP) pays non établi dans la noticeUniversité ou école supérieure
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Universidade Estadual Paulista (Unesp) pays non établi dans la noticeUniversité ou école supérieure
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Leibniz Institute of Freshwater Ecology and Inland Fisheries pays non établi dans la noticeStructure de recherche
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Instituto Federal de Educação pays non établi dans la noticeUniversité ou école supérieure
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Nanyang Technological University National Institute of Education pays non établi dans la noticeUniversité ou école supérieure
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Universidade de São Paulo pays non établi dans la noticeUniversité ou école supérieure
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Sao Paulo State University pays non établi dans la noticeUniversité ou école supérieure
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University of Campinas - Unicamp pays non établi dans la noticeUniversité ou école supérieure
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Federal Institute of Education pays non établi dans la noticeStructure de recherche
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University of Sao Paulo pays non établi dans la noticeUniversité ou école supérieure
Universidade Estadual de Campinas (UNICAMP), Universidade Estadual Paulista (Unesp) et Leibniz Institute of Freshwater Ecology and Inland Fisheries, avec 7 autres affiliations.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.