Análise do perfil longitudinal e da sinuosidade do rio da Várzea (RS) na relação com o controle estrutural

Abstract

This study aimed to investigate the characteristics of Várzea River longitudinal profile in relation to its basin morphodynamics and as an indicator or not of structural influences in relief morphogenesis. Longitudinal profile is a method to indicate possible anomalies that might be related to relief transformation. In order to achieve the results, information on the distance from altimetric levels extracted by reading the topographic maps on a scale of 1:100,000 covering Várzea River basin areawas processed; satellite images for identification and analysis of knickpoints were appraised; moreover calculations were performed to obtain the SL index, slope, channel gradient and sinuosity. Results indicate a well-developed drainage network in some parts of the basin while others are asymmetrical. The normalized profile and the arithmetic profile differ in terms of slope breaks, but there is not much difference between the k index and the SL index. In addition, it was possible to classify Várzea river as a meandering channel, and to associate the presence of knickpoints with stretches of the channel with greater sinuosity.