Utilize este identificador para referenciar este registo: http://hdl.handle.net/10451/28096
Título: Controlling factors of the size and location of large gully systems: a regression-based exploration using reconstructed pre-erosion topography
Autor: Bergonse, Rafaello
Reis, Eusébio
Palavras-chave: Gully erosion
Gully complex
Logistic regression
Multiple linear regression
Data: 2016
Editora: Elsevier
Citação: Catena 147 (2016) 621–631
Resumo: The role of different factors potentially affecting the size and location of large gully systems is explored in two tributary basins of the Tagus River (S Portugal). The hillslopes of these basins, corresponding to tertiary sedimentary formations, are affected by hundreds of large gully systems, varying in extent from somewhat b200 m2 to N3 ha. A study set of 90 gully systems were vectorized from aerial ortophotos and analysed in relation to a set of potential control variables, obtained by reconstructing the pre-erosion topography. Multiple linear regression and logistic regression were combined in order to investigate controls over the general morphometry of these landforms (area, perimeter and sinuosity) and their location in the respective basins. Results indicate that gully systems initiated as bank gullies in response to an incision by the drainage network in both basins and then evolved as a function of upslope contributing area, developing progressively more sinuous outlines as a result of headcut bifurcation. Pre-erosion topographic formwas shown to have only a marginal effect, with results suggesting gully systems have grown essentially throughmassmovements in headcuts and sidewalls, influenced by subsurface water.
Peer review: yes
URI: http://hdl.handle.net/10451/28096
DOI: 10.1016/j.catena.2016.08.014
ISSN: 0341-8162
Aparece nas colecções:IGOT - Artigos em Revistas Internacionais

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