| Autor: |
Ayala Izurieta JE; Image Processing Laboratory (IPL), University of Valencia, 46980 Paterna, Spain.; Group of Research for Watershed Sustainability (GISOCH), Faculty of Sciences, Escuela Superior Politécnica de Chimborazo (ESPOCH), Riobamba 060155, Ecuador., Beltrán Dávalos AA; Group of Research for Watershed Sustainability (GISOCH), Faculty of Sciences, Escuela Superior Politécnica de Chimborazo (ESPOCH), Riobamba 060155, Ecuador.; Unit for Sustainable Environmental and Forest Management, Department of Soil Science and Agricultural Chemistry, University of Santiago de Compostela, E-27002 Lugo, Spain., Jara Santillán CA; Image Processing Laboratory (IPL), University of Valencia, 46980 Paterna, Spain.; Research Group in the Natural Resources Field (GIARN), Faculty of Natural Resources, Escuela Superior Politécnica de Chimborazo (ESPOCH), Riobamba 060155, Ecuador., Godoy Ponce SC; Group of Research for Watershed Sustainability (GISOCH), Faculty of Sciences, Escuela Superior Politécnica de Chimborazo (ESPOCH), Riobamba 060155, Ecuador., Van Wittenberghe S; Image Processing Laboratory (IPL), University of Valencia, 46980 Paterna, Spain., Verrelst J; Image Processing Laboratory (IPL), University of Valencia, 46980 Paterna, Spain., Delegido J; Image Processing Laboratory (IPL), University of Valencia, 46980 Paterna, Spain. |
| Abstrakt: |
The water of high Andean lakes is strongly affected by anthropic activities. However, due to its complexity this ecosystem is poorly researched. This study analyzes water quality using Sentinel-2 (S2) images in high Andean lakes with apparent different eutrophication states. Spatial and temporal patterns are assessed for biophysical water variables from automatic products as obtained from versions of C2RCC (Case 2 Regional Coast Color) processor (i.e., C2RCC, C2X, and C2X-COMPLEX) to observe water characteristics and eutrophication states in detail. These results were validated using in situ water sampling. C2X-COMPLEX appeared to be an appropriate option to study bodies of water with a complex dynamic of water composition. C2RCC was adequate for lakes with high transparency, typical for lakes of highlands with excellent water quality. The Yambo lake, with chlorophyll-a concentration (CHL) values of 79.6 ± 5 mg/m 3 , was in the eutrophic to hyper-eutrophic state. The Colta lake, with variable values of CHL, was between the oligotrophic to mesotrophic state, and the Atillo lakes, with values of 0.16 ± 0.1 mg/m 3 , were oligotrophic and even ultra-oligotrophic, which remained stable in the last few years. Automatic S2 water products give information about water quality, which in turn makes it possible to analyze its causes. |
