Diffuse Attenuation of Clear Water Tropical Reservoir: A Remote Sensing Semi-Analytical Approach

The diffuse attenuation coefficient of downwelling irradiance (Kd) is an essential parameter for inland waters research by remotely sensing the water transparency. Lately, Kd semi-analytical algorithms substituted the empirical algorithms widely employed. The purpose of this research was to reparame...

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Bibliographic Details
Published inRemote sensing (Basel, Switzerland) Vol. 12; no. 17; p. 2828
Main Authors Pedroso Curtarelli, Victor, Clemente Faria Barbosa, Cláudio, Andrade Maciel, Daniel, Flores Júnior, Rogério, Menino Carlos, Felipe, de Moraes Novo, Evlyn Márcia Leão, Curtarelli, Marcelo Pedroso, da Silva, Edson Filisbino Freire
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.09.2020
Subjects
Algorithms
Attenuation coefficients
Constituents
Detection
diffuse attenuation coefficient
downwelling irradiance
empirical algorithm
Empirical analysis
Inland waters
Irradiance
Laboratories
Light
Mathematical analysis
Precipitation
Remote sensing
remote sensing of water transparency
Reservoirs
Rivers
Runoff
Seasonal variations
Sediments
semi-analytical algorithm
Surface runoff
Time series
Water outflow
Water quality
Watersheds
United States > US
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Summary:The diffuse attenuation coefficient of downwelling irradiance (Kd) is an essential parameter for inland waters research by remotely sensing the water transparency. Lately, Kd semi-analytical algorithms substituted the empirical algorithms widely employed. The purpose of this research was to reparametrize a semi-analytical algorithm to estimate Kd and then apply it to a Sentinel-2 MSI time-series (2017–2019) for the Três Marias reservoir, Brazil. The results for the Kd semi-analytical reparametrization achieved good accuracies, reaching mean absolute percentage errors (MAPE) for bands B2, B3 and B4 (492, 560 and 665 nm), lower than 21% when derived from in-situ remote sensing reflectance (Rrs), while for MSI Data, a derived MAPE of 12% and 38% for B2 and B3, respectively. After the application of the algorithm to Sentinel-2 images time-series, seasonal patterns were observed in the results, showing high Kd values at 492 nm during the rainy periods, mainly in the tributary mouths, possibly due to an increase in the surface runoff and inflows and outflow rates in the reservoir watershed.
ISSN:2072-4292
2072-4292
DOI:10.3390/rs12172828