Abstract
Abstract. This work evaluates the influence of land use and land cover (LUC) data with different properties on the landslide susceptibility zonation of the road network in the Zêzere watershed (Portugal). The information value method was used to assess the landslide susceptibility using two models: one including detailed LUC data (the Portuguese Land Cover Map – COS) and the other including more generalized LUC data (the CORINE Land Cover – CLC). A set of fixed independent layers was considered as landslide predisposing factors (slope angle, slope aspect, slope curvature, slope-over-area ratio, soil, and lithology) while COS and CLC were used to find the differences in the landslide susceptibility zonation. A landslide inventory was used as a dependent layer, including 259 shallow landslides obtained from the photointerpretation of orthophotos from 2005, and further validated in three sample areas. The landslide susceptibility maps were assigned to the road network data and resulted in two landslide susceptibility road network maps. The models' performance was evaluated with prediction and success rate curves and the area under the curve (AUC). The landslide susceptibility results obtained in the two models present a high accuracy in terms of the AUC (>90 %), but the model with more detailed LUC data (COS) produces better results in the landslide susceptibility zonation on the road network with the highest landslide susceptibility.
Highlights
Landslides are natural processes that can constrain the free movement of people and goods when they directly or indirectly affect road networks (Bíl et al, 2014, 2015; Hilker et al, 2009; Meneses, 2011; Winter et al, 2013)
The choice of landslide predisposing factors and the main details of the geographical information are not explained in a landslide susceptibility assessment based on statistical methods; rather, criteria defined in the literature are used for this selection because they can explain the occurrence of slope movements in the study area
This study was performed in the Zêzere watershed (5063.9 km2) located in the center region of mainland Portugal (Fig. 1)
Summary
Landslides are natural processes that can constrain the free movement of people and goods when they directly or indirectly affect road networks (Bíl et al, 2014, 2015; Hilker et al, 2009; Meneses, 2011; Winter et al, 2013). Landslide susceptibility assessment is crucial to identifying locations with higher probabilities of landslide occurrence (Conforti et al, 2014; Guillard and Zêzere, 2012; Guzzetti et al, 2006; Pereira et al, 2014; van Westen et al, 2008). The choice of landslide predisposing factors and the main details of the geographical information are not explained in a landslide susceptibility assessment based on statistical methods; rather, criteria defined in the literature (e.g., slope angle, slope aspect, slope curvature, soil, lithology, land use, and land cover) are used for this selection because they can explain the occurrence of slope movements in the study area
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
