Water quality assessment using Sentinel-2 imagery with estimates of chlorophyll a, Secchi disk depth, and Cyanobacteria cell number: the Cantareira System reservoirs (Sao Paulo, Brazil)

Autor(es)

Pompeo, Marcelo ^[1] ; Moschini-Carlos, Viviane ^[2] ; Bitencourt, Marisa Dantas ^[1] ; Soria-Perpinya, Xavier ^[3] ; Vicente, Eduardo ^[3] ; Delegido, Jesus ^[4]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Dept Ecol, Sao Paulo - Brazil

^[2] Univ Sao Paulo State UNESP, ICT, Sorocaba Campus, Sorocaba - Brazil

^[3] Univ Valencia, Dept Microbiol & Ecol, Burjassot Campus, Burjassot - Spain

^[4] Univ Valencia, Image Proc Lab, Paterna Campus, Paterna - Spain

• Tipo de documento: Artigo Científico
• Fonte: Environmental Science and Pollution Research; v. 28, n. 26, SI, p. 34990-35011, JUL 2021.
• Citações Web of Science: 1

Resumo

Satellite images were used to assess surface water quality based on the concentration of chlorophyll a (chla), light penetration measured by the Secchi disk method (SD), and the Cyanobacteria cells number per mL (cyano). For this case study, six reservoirs interconnected were evaluated, comprising the Cantareira System (CS) in Sao Paulo State (Brazil). The work employed Sentinel-2 images from 2015 to 2018, SNAP image processing software, and the native products conc\_chl and kd\_z90max, treated using Case 2 Regional Coast Color (C2RCC) atmospheric correction. The database was obtained from CETESB, the agency legally responsible for operation of the Inland Water Quality Monitoring Network in Sao Paulo State. The results demonstrated robustness in the estimates of chla (RMSE = 3.73; NRMSE% = 19%) and SD (RMSE = 2,26; NRMSE% = 14%). Due to the strong relationship between cyano and chla (r(2) = 0.84, p < 0.01, n = 90), both obtained from field measurements, there was also robustness in cyano estimates based on the estimates of chla from the satellite images. The data revealed a clear pattern, with the upstream reservoirs being more eutrophic, compared to those downstream. There were evident concerns, about water quality, particularly due to the high numbers of Cyanobacteria cells, especially in the upstream reservoirs. (AU)

• Processo FAPESP: 16/24528-2 - Metais em sedimentos de reservatórios paulistas: subsídio à tomada de decisões através de abordagens geoestatística e ecotoxicológica
• Beneficiário: Marcelo Luiz Martins Pompêo
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 16/17266-1 - A Diretiva Quadro da Água da Comunidade Européia: aplicações utilizando o fitoplâncton como discriminador ambiental em reservatórios brasileiros
• Beneficiário: Viviane Moschini Carlos
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 19/10845-4 - Qualidade da água de reservatórios paulistas: o peso das evidências
• Beneficiário: Marcelo Luiz Martins Pompêo
• Modalidade de apoio: Auxílio à Pesquisa - Regular