Influência do desmatamento na disponibilidade hídrica da bacia hidrográfica do Córrego do Galo, Domingos Martins, ES

• Autor(a) principal: Almeida, André Quintão de
• Data de Publicação: 2007
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da Universidade Federal do Espírito Santo (riUfes)
• Texto Completo: http://repositorio.ufes.br/handle/10/3870
• topic: Engenharia Sanitária; Hidrologia - Jucu, Rio (ES); Sistemas de informação geográfica; Satélites; Desmatamento; 628

The present study aims at evaluating the deforestation impact on the hydrologic dynamic of a river basin. The work was held at the Galo stream basin (973Km²), Domingos Martins district of Espírito Santo, taking into consideration an analysis period of thirty years (1975/2005). Aiming at characterizing the basin hydrologic behavior, a morphological modeling was made. To do so, it was used systems of geographical information and cartographic elements (level curves and hydrograph) found in the IBGE planialtimetric letters. For the years 1975, 1985, 1995 and 2005, forest remaining maps were created through remote sensorial panacea and LANDSAT satellite images. It was used, in the hydrology historical files, the resource on statistical analysis of temporal series (BOX & JENKINGS), with the desire of observing the existence of tendencies. The registration analyzed were precipitation (m/m) and emptying (m³/s), both available in the Hydrologic Information System (HIDROWEB) of ANA and hydrologic answer, calculated through the reason between emptying and precipitation. In relation to morphometric modeling, the main results were: the basin has an elongated form, its capacity coefficient is 1, 83, the factor form is 0, 1 and the density of drainage is 2, 68 Km/Km². In relation to temporal characterization of forest remaining, the results indicate a tendency in the period of 1975 to 1995, with a reduction of forest area in the basin of 581,31to 393, 63 Km². In the period of 1995 to 2005, such tendency is no longer observed, there was an increase of forest area of 457, 73 Km². The results gotten with an analysis of hydrologic data did not show any tendency, indicating the non existence of a relation between deforestation and hydrologic dynamic of the Galo stream basin.