Influência da pluviosidade na balneabilidade das praias da Barra da Tijuca, município do Rio de Janeiro

Abstract

In the present study, an analysis of the spatial distribution of the values of thermotolerant coliforms of the beaches of Recreio, Barra da Tijuca and Joatinga, under the influence of rainfall, during the period from 2010 to 2019, was carried out, in order to identify possible sources of pollution on the beaches. When significant rainfall occurs (large volume of water) in a short period, there is generation of surface runoff from the terrain, the primary route by which microbiological indicators (thermotolerant coliforms, Escherichia coli and/or Enterococci) reach the beaches. The methodology consisted of the rain threshold level technique that analyzes the frequency of observations of colimetric levels and rainfall events through statistical analysis, Spearman's correlation between the variable level of precipitation and the variable colimetry in the dry (May to November) and rainy (December to April) periods. The results showed that the variation of tidal amplitude and precipitation has a significant effect on the bathing ability of the beaches of Barra da Tijuca, presenting a higher correlation in the rainy season. The contribution of bacteria is associated with the proximity to the mouth of the Joatinga channel that drains the water in the lagoon complex of Jacarepaguá.