Dissertação
Recarga e flutuação do nível da água subterrânea em subbacias com floresta e campo nativo
Fecha
2011-11-16Registro en:
DAMBRÓS, Cristiane. RECHARGE AND FLUCTUTION LEVEL OF GROUNDWATER IN SUB-BASINS WITH FOREST AND NATIVE FIELD. 2011. 119 f. Dissertação (Mestrado em Engenharia Civil) - Universidade Federal de Santa Maria, Santa Maria, 2011.
Autor
Dambrós, Cristiane
Institución
Resumen
This study aims to contribute to the investigations aimed at understanding the behavior of
groundwater. With the aim of guiding the determination of groundwater recharge estimation and
analysis of the fluctuation of water level in relation to meteoric precipitation events. Given the research
goals relies on references: theoretical and conceptual, highlighting topics such as watershed,
groundwater level fluctuation and sustainability; methodology was applied to the quantitative method
in a systemic approach in two sub-basins, of a native field and the other with eucalyptus forest, which
is located at the outcrop zone of the Guarani Aquifer System, at rural area of the Rosário do Sul/Rio
Grande do Sul state/southern Brazil. We installed five monitoring wells and assessed the levels of
groundwater for approximately two hydrological years. A well was drilled in the sub-basin of field and
four wells in the sub-basin with forest. To estimate the recharge to one unconfined aquifer, used the
method Water Table Fluctuation WTF. Analyses of the physical characteristics of soil and rock
samples were used in detailed studies of laboratory tests related to grain size, hydraulic conductivity
and porosity. For the method WTF, needed to perform the determination of the parameters: Specific
Yield - Sy and the sum of the extrapolated values for each recession curve - ∆h. The results were
satisfactory, and the range of the fluctuation level values between 1.36 and 4.52 meters and the
estimated total groundwater recharge of precipitation in the period from 3.97% for sub-basin of the
native field and 3.20% at forested sub-basin. It is concluded that studies on the recharge of an aquifer
are critical for sustainable management of water resources at the local level (monitoring well) and
watershed scales.