Identificación de los impactos producidos en la calidad del agua del embalse de la Laguna de San Marcos mediante la simulación de la eutrofización con el uso del software AQUATOX

Abstract

San Marcos lagoon borders the province of Sucumbíos and Pichincha. It is part of the Cayambe-Pedro Moncayo Irrigation Canal project, which expects to supply water to 14,000 families, both for irrigation and for human consumption. Reason for maintaining the quality parameters of the water resource. There is a probability that the lagoon will be eutrophied by excess nutrients such as phosphorus and nitrogen. Therefore, the objective of this research is to predict the state of eutrophication of the San Marcos Lagoon reservoir through simulations in the AQUATOX software. For this, 6 sampling campaigns were carried out, where 3-point water samples were collected, for biological and physicochemical analyzes, and also to obtain the results of additional parameters that the software requires such as: nitrates, ammonia, phosphates, total phosphorus, CO2, dissolved oxygen, total solids, chlorophyll a, cyanobacteria, and also parameters such as radiation, evaporation, wind speed and temperature; which were taken from the meteorological stations near the study site. To determine the current and future trophic status of the lagoon, the comparison was made using the three important variables as OECD says, those are total phosphorus, chlorophyll and secchi disk, with the limit values for the trophic classification. As results, a high trophic level (hypereutrophic) were obtained for phosphorus and chlorophyll of 146.5 mg / m3, and 1.5 mg / m3 respectively, and for the secchi disk 1,658 m being at a mesotrophic level.