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Geosciences 2018, 8(1), 2; https://doi.org/10.3390/geosciences8010002

Understanding Constraints and Triggering Factors of Landslides: Regional and Local Perspectives on a Drainage Basin

1
Nemus-Gestão e Requalificação Ambiental, Lda., 1649-038 Lisboa, Portugal
2
Centre for Geographical Studies, Institute of Geography and Spatial Planning, Universidade de Lisboa, Edifício IGOT-Rua Branca Edmée Marques, 1600-276 Lisboa, Portugal
3
Department of Geosciences, University of Oslo, Sem Sælands vei 1, 0371 Oslo, Norway
4
Department of Geology and Institute Dom Luiz, Faculty of Sciences, Universidade de Lisboa, 1749-016 Lisbon, Portugal
*
Author to whom correspondence should be addressed.
Received: 9 November 2017 / Revised: 17 December 2017 / Accepted: 19 December 2017 / Published: 26 December 2017
(This article belongs to the Special Issue Natural Hazards and Risks Assessment)
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Abstract

The Grande da Pipa River (GPR) basin (Portugal) has natural conditions that favor the occurrence of landslides. The hydrological year 2009/10 was characterized by high amounts of rainfall, which led to the occurrence of an also high number of landslides in this basin. The hydrodynamic character of the GPR basin was analyzed through a lumped parameter model of daily sequential water balances, in order to understand its influence in the stability of natural slopes. Results from the model were confronted to the inventory of landslides that occurred in the basin during the hydrological year 2009/10. Morphological, geotechnical, and hydrological local conditions affecting slope stability were also analyzed through back-analyses of two selected deep-seated landslides. Data here presented shows that the rise of water table is an important triggering factor for landslides. The most important constraint for landslides in the area is the degree of weathering and thickness of the upper layer of degraded marls. In most of the basin, the degraded layer is less than 5 m deep, causing the occurrence of shallow and intermediate landslides. However, deep-seated landslides were also found in areas, even with degraded marls that were less than 5 m-thick, where landslides have also occurred in the past. View Full-Text
Keywords: landslides; water table; shear strength parameters; Rio Grande da Pipa; Portugal landslides; water table; shear strength parameters; Rio Grande da Pipa; Portugal
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Jesus, C.C.; Oliveira, S.C.; Sena, C.; Marques, F. Understanding Constraints and Triggering Factors of Landslides: Regional and Local Perspectives on a Drainage Basin. Geosciences 2018, 8, 2.

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