Journal
REMOTE SENSING OF ENVIRONMENT
Volume 158, Issue -, Pages 28-41Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.rse.2014.10.032
Keywords
Remote sensing; Reservoir; Landsat; Water quality; Linear mixed models; Algorithms
Funding
- SECyT-UNRC (Secretaria de Ciencia y Tecnica, Universidad Nacional de Rio Cuarto)
- CONICET (Consejo Nacional de Investigaciones Cientificas y Tecnicas)
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The application of remote sensing technology to water quality monitoring has special significance for lake management at regional scales. Many studies have proposed algorithms between Landsat data and in-situ water quality parameters using classical regression models. The novelty of this paper is that we developed algorithms to determine log-transformed chlorophyll-a concentration (Chl-a) and Secchi disk transparency (SDT) in Rio Tercero reservoir using Landsat TM and ETM + imagery, ancillary environmental factors and linear mixed models (LMM), obtaining an increase in the accuracy of the estimates. The validation results showed that LMM with spatial correlation structure that take into account water surface temperature (WST) and rainfall were the most suitable method for estimating these parameters. WST derived from the Landsat thermal band was also validated. The algorithms were used to generate quantitative maps providing spatially and temporally rich information on patterns of water quality throughout the reservoir. Water quality features related to the hydrogeomorphology of the reservoir, typical seasonality and influx from the cooling system of a local nuclear reactor were identified in the time series maps. (C) 2014 Elsevier Inc. All rights reserved.
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