Development of an empirical model for chlorophyll- a and Secchi Disk Depth estimation for a Pampean shallow lake (Argentina)

RIVAS, RAÚL; ZAGARESE, HORACIO E.; CARMONA, FACUNDO; DIOVISALVI, NADIA; BOHN, VANESA Y.; LAGOMARSINO, LEONARDO

The Egyptian Journal of Remote Sensing and Space Science

National Authority for Remote Sensing and Space Sciences

Año: 2018 vol. 21 p. 183 - 191

1110-9823

Shallow Pampean lakes are located in the most productive plain of Argentina. They are highly variable in salinity, turbidity and surface area. Laguna Chascomús has been monitored as a representative example of them. We developed a linear model based on satellite images validated against field measurements (2001?2011 period). A vegetation index and Landsat Surface Reflectance (Band 4) produced the best correlations with chlorophyll-a (Chl-a) and Secchi Disk Depth (SDD), respectively. In a second instance, a retrospective analysis (1986?2013) was performed. As a result, significant positive trends were observed for SDD and Chl-a. In addition, both variables displayed trends related to rainfall and site depth.