Assoreamento de lago integrante da sub-baciado Córrego da Cascata, Botucatu, SP: implicações morfométricas

• Autor(a) principal: Beluta, Ivalde [UNESP]
• Data de Publicação: 2014
• Outros Autores: Jesus, Silvio Alexandre de [UNESP], Vieira, Márcio Piedade [UNESP], Corrêa, Nelita Maria [UNESP], Cardoso, Lincoln Gehring [UNESP], Campos, Sergio [UNESP], Valente, José Pedro [UNESP]
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://www.seer.ufu.br/index.php/caminhosdegeografia/article/view/24694; http://hdl.handle.net/11449/137716
• topic: Sub-watershed; Siltation; Sediment; Sub-bacia hidrográfica; Assoreamento; Sedimento

The watershed is considered a unit of territorial study, planning and land management, and is molded by the local geologic conditions and climate. Thus, this study aimed to assess the morphometric features of the subwatershed of Cascata Stream, in Botucatu (SP), and their implications for the siltation process in a lake. The assessment included indexes generated from data calculated by means of a digitalized cartographic basis georeferenced on the 1:10,000 scale using the software AutoCad map 2004. The software Quantum GIS 1.8 was also employed to generate the digital elevation model (DEM) and the map of declivities which led to the mean declivity (Dm) of the subwatershed. According to the indexes form factor (Kf), sinuosity (Is), circularity (Ic) and compacity coefficient (Kc), the subwatershed had elongated form, low propensity to floods and rapid flow. The draining density (Dd) and relief ratio (Rr) indicated more efficient mean drainage, favoring higher desiccation and mean erosive stage. The roughness coefficient (Cr) indicated that this subwatershed is suited to agriculture. The anthropic intervention at the watershed dividing line is the major factor for sediment carrying in the lake and compromises not only the landscape beauty, but also the aquatic life of this ecosystem.