Inversão gravimétrica estável do relevo da base e da variação da densidade com a profundidade em aterros sanitários
The present method assumes a decrease in the density contrast of a sedimentary basin according to a hyperbolic law in a waste landfill and uses two approaches: (1) the estimation of the bottom of a waste landfill assuming that the gravity anomaly, the density contrast at the surface and the decay...
| Autor principal: | TEIXEIRA, Wlamir Abreu |
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| Grau: | Dissertação |
| Idioma: | por |
| Publicado em: |
Universidade Federal do Pará
2014
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| Assuntos: | |
| Acesso em linha: |
http://repositorio.ufpa.br/jspui/handle/2011/5802 |
| Resumo: |
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The present method assumes a decrease in the density contrast of a sedimentary basin
according to a hyperbolic law in a waste landfill and uses two approaches: (1) the estimation of
the bottom of a waste landfill assuming that the gravity anomaly, the density contrast at the
surface and the decaying factor of the density contrast with depth are known; (2) the estimation
of the density contrast at the surface and of the decaying factor of the density contrast with depth,
assuming that the gravity anomaly and the relief of the waste landfill bottom are known. A
variation of the latter approach consists in using the known depth values to the landfill bottom to
produce a fitted gravity anomaly and estimate the density contrast at the surface and the decaying
factor of the density contrast with depth via minimization of the Euclidean norm of the residual
vector between the observed and fitted anomalies. In both cases the interpretation model is a set
of vertical rectangular 2D prisms whose thicknesses are parameters to be estimated and represent
the depth to the interface separating sediments and basement. The solutions of both problems are
stable because of the incorporation of additional a priori information about the smoothness of the
estimated relief. The presented method was applied to synthetic data produced by simulated
waste landfills having maximum depth to the bottom smaller than 15 m and presenting smooth
relief. The results were consistent and demonstrated the effectiveness of the method in both
approaches. The method was also applied to the residual Bouguer anomaly from the Thomas
Farm, Indiana, USA, leading to the conclusion that the density contrast of the landfill is either
constant or present a maximum variation of about 0.09 g/cm3. |