Determination of chlorophyll-a concentration in Rio Tercero dam using CBERS-2B satellite image

BONANSEA, MATIAS; RODRIGUEZ, CLAUDIA; LEDESMA, CLAUDIA

Río Cuarto

Jornada; VI Jornada Científico- Técnica de la Facultad de Agronomía y Veterinaria; 2013

Universidad nacional de Río Cuarto

Satellite images, provided by remote sensing, can be used as an innovative tool in monitoring, control and management of water resources. The main objective of this study was to model the spatial distribution of chlorophyll-a (cl-a) in Rio Tercero dam. This reservoir (32,2128 W, 64,4761 S), located in the center of Córdoba´s province is the largest artificial water body in the province. In its coasts there are several large urban settlements which use this resource as a source of water for human and animal consumption, irrigation, power generation, fishing and recreation. Samplings were conducted during fall of 2008 coinciding with the passage of the CBERS-2B Satellite by the study area. 15 sites were selected inside of the dam, in each one geographic location coordinates and physicochemical parameters were measured. In laboratory concentration of cl-a was determined. We used a CBERS-2B image (Date: 27/04/2008), which was georeferenced (RMS=0.84). A Principal Component Analysis was perfomed to identify associations between reflectance data of the image´s bands and the values of cla-a measured. The estimated response (R2=0,73) for multiple linear regression model of the parameter cl-a was created, using as independent variables bands 2 and 3 of CBERS-2B satellite. In conclusion, we were able to evaluate the spatial behavior of the cl-a in Río Tercero reservoir, providing information relating to the distribution of this parameter over the entire reservoir.