Influência do ambiente rural e urbano em variáveis limnológicas na microbacia hidrográfica do Arroio Alberti - RS

Abstract

This paper presents a study to identify the influence of the rural area and urban area in limnological variables in Watershed of Alberti creek, situated in the municipality of São João do Polêsine/RS. The methodology consists of the acquisition of limnological data from creek waters in the study and interpretation of these data. The Limnological variables used were: water temperature, air temperature, pH, electrical conductivity, total of solids suspension and turbidity. These variables were measured at two different sample groups: first period from July to November 2014, this modality used weekly courses, totaling 21 collect; the second period was from January to July 2015, this case were conducted monthly field, adding seven collect. Was chosen two sample points, the first point (P1), allocated the amount of the urban area of São João do Polêsine, and the second point (P2) located downstream of the city. We evaluated the influence of precipitation and adjacent environments to sample points in limnological variables of Alberti creek. The location of the sample point (P2) significantly affect the behavior of pH and electrical conductivity due to urban sewage release upstream of this point. The rainfall affected the variables turbidity and TSS. Facing the results, the importance of this work lies on the acquisition of knowledge and the creation of data about how these water resources respond to anthropic action, knowing that these findings contribute to the maintenance of the quality of water of these watershed, as well as comprehending the processes the happen in these environments