Título: | ASSESSMENT OF GROUNDWATER RECHARGE AND SUSTAINABLE RESOURCES IN A SMALL CRYSTALLINE FRACTURED ROCK DRAINAGE BASIN WITH NUMERICAL MODELING | |||||||
Autor: |
ANA BEATRIZ DA CUNHA BARRETO |
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Colaborador(es): |
EURIPEDES DO AMARAL VARGAS JUNIOR - Orientador JOHN EDWARD GALE - Coorientador |
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Catalogação: | 10/JAN/2011 | Língua(s): | PORTUGUESE - BRAZIL |
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Tipo: | TEXT | Subtipo: | THESIS | |||||
Notas: |
[pt] Todos os dados constantes dos documentos são de inteira responsabilidade de seus autores. Os dados utilizados nas descrições dos documentos estão em conformidade com os sistemas da administração da PUC-Rio. [en] All data contained in the documents are the sole responsibility of the authors. The data used in the descriptions of the documents are in conformity with the systems of the administration of PUC-Rio. |
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Referência(s): |
[pt] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=16715&idi=1 [en] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=16715&idi=2 |
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DOI: | https://doi.org/10.17771/PUCRio.acad.16715 | |||||||
Resumo: | ||||||||
The estimation of groundwater recharge and its spatial and temporal
variability in a drainage basin is essential for sustainability assessments and
requires, in most cases, the use of an appropriate 3D numerical flow and transport
model. For most drainage basins, the bedrock and overburden geology maps exist,
the location and geometry of major structural features can be identified using
available GIS databases, and surface water and terrain elevation data at an
appropriate scale are readily available. In order to use 3D models to provide an
initial assessment of the sustainability of the groundwater resource extraction of a
specific drainage basin, the 3D model has to be populated with hydraulic
properties that are consistent with the range of values that are representative of the
rock types that underlie the drainage basin. A review of hydrogeological data
from a number of sites shows that while there is a wide range in the hydraulic
properties of fractured rocks in general, the range for individual rock types is
more constrained, (i.e. fractured granite versus fractured gabbro). There is a great
amount of hydrogeological data from fractured rock masses that have been
investigated in detail as part of nuclear waste, mining and civil engineering
projects around the world. Data from a specific site can be used as a first approach
in another one, not investigated, once they have the same geologic characteristics
and tectonic environment. This approach was used to model the sustainable
groundwater yield of a small drainage basin in Southeast Brazil. Data on major
structures and fracture systems were extracted from satellite images, aerial photos
and outcrop expositions using GIS environment. The groundwater flow model
was constructed using terrain elevation data, geology maps, hydrological records,
as well as soil type and land use maps. FEFLOW (Diersch, 1988) was used to
simulate the spatial and temporal distribution of groundwater recharge in the
basin, using different pumping scenarios. The model was capable to yield a good
estimation of groundwater resources in the watershed, as a first approach, and to
assess groundwater and surface water relations in natural conditions and in stress
scenarios being a useful tool for sustainability analysis of groundwater
exploitation.
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