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Estudo experimental e de modelagem matemática do escoamento subterrâneo em uma vertente de zona ripária no bioma Cerrado

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Repositório Institucional da Universidade de Brasília
Keywords
  • Resistividade Elétrica
  • Hidrologia
  • Modelagem Numérica
  • Hidrogeologia
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Abstract

Riparian zones have essential role of hydrological connectivity between the hillslope and the streams, emphasizing the importance of understanding the hydrological processes that are established in them. Therefore, this paper presents the development of an experimental design with the acquisition of geophysical data for the indirect characterization of soil water behavior as well as from the resolution of a two-dimensional vertical numerical model focused on the simulation of water flow in the soil environment riparian zone. The watershed of the Capetinga stream, located in the southern part of the Federal District, was used as an experimental area with collection of geophysical data and monitoring of soil moisture during the period from August 2015 to February 2016. Geophysical surveys were conducted through electrical method of direct current resistivity technique and Wenner arrangement, considering the spatial variation in 200 meters of hillslope, totaling six lines monitoring (five parallel and one orthogonal to the Capetinga stream). Differential equation that governs the flow of water in the saturation of surfaces was solved by numerical approximation by finite element method. The electrical resistivity traversing possible to monitor the spatial and temporal variations in the values of electrical resistivity soil, as an indication of the behavior of water, especially identifying the saturated zone along the hillslope. Thus, the information obtained from the geophysical surveys allowed the characterization of the initial conditions and verification of the results of head hydraulic resulting from the simulation of water flow in the model domain. Regarding the soil moisture, the application of gravimetric methods, TDR probe and gypsum blocks was carried out in order to instrumentalize obtaining direct and indirect data and expand the temporal and spatial scale of the water content monitoring in the unsaturated zone. The numerical model, in turn, results had converged by adopting hydraulic conductivity equal to 0.04 m/d. In this case, the simulators base flow values presented order of magnitude equivalent to those resulting from recursive filter Arnold and Allen (1999). Overall, this work contributed to the water of behavior analysis on soil hillslope, being an initial step in understanding the complexity of hydrological processes established in this environment that is a unit of essential landscape at the watershed scale.

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