Integration of geological and hydrogeological features for subsidence modelling in volcanic zones
Por:
Ochoa-González G., Carreón-Freyre D.
Publicada:
1 ene 2010
Resumen:
Land subsidence is related to the increase of effective stresses in geological media. This work aims to propose a numerical model to simulate land subsidence and related fissuring caused by the reduction of the piezometric levels due to pumping. The proposed model includes different geological features that affect the groundwater flow patterns, such as faults as well as hydraulic and geomechanical anisotropy related to stratigraphic variations. The methodology consists in establishing a 3-D hydraulic model used for interpreting pumping tests in geological setting with the features described above. Then, using the finite element Aster Code, integrate variations of transmissivities caused by local stratigraphy and incorporate elastoplastic behaviour in a 2-D simulation of deformation. Our results suggest that when subsidence occurs, not only the superficial compressible geological deposits should be considered but the sum of the whole sequence affected by piezometric level variations. We demonstrate that the local and regional faulting control the pattern of piezometric variations. Copyright © 2010 IAHS Press.
Filiaciones:
Ochoa-González G.:
Dept. del Habitat Y Desarrollo Urbano, Instituto Tecnologico Y de Estudios Superiores de Occidente (ITESO), Periferico Sur Manual Gomez Morin 8585, 45604, Tlaqupaque, Jalisco, Mexico
Carreón-Freyre D.:
Centro de Geociencias, Universidad Nacional Autonoma de Mexico (UNAM), Mexico
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