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In order to determine which component contributes most to the vertical attenuation coefficient for downward Irradiance -{Kd(PAR)}- in Riogrande II reservoir, a multiple linear regression model was used to obtain -{Kd(PAR)}- considering the sum of partial Kd contributed by water Kw chlorophyll a (Kchl a), particulated inanimate material (tripton, Ktripton), and phytoplankton-like particles (Kp-phyto). Samples of water were taken with a Schindler bottle. The photosyntetic active radiation (PAR) was measured with a Li-cor quantameter at five sampling stations every 10 days from July 2002 to July 2003. Total suspended solids, inorganic suspended solids, volatile suspended solids, and chlorophyll a were quantified. Given that the Ktripton (1,14 m-1) value was the highest, the prediction that the influence of Kchl a, Kp-phyto and Ktripton would be high and similar at the upstream Chico River station was partially accepted. The equation to estimate Kd(PAR) for the reservoir was Kd(PAR) = 1,32Dsd-0,93, with Dsd explaining 62,4 % of the variation in Kd Optically, the reservoir was classified as T-type and case 2, which correspond to a turbid system where despite its eutrophic condition and high productivity, tripton and not phytoplankton was the fraction that harvested more photosynthetic quanta.

revista de la academia colombiana de ciencias exactas, físicas y naturales/revista de la academia colombiana de ciencias exactas, físicas y naturales

Cuantificación de los componentes que afectan el coeficiente vertical de atenuación vertical de la irradiancia descendente en el embalse Ríogrande II (Colombia)