Abstract
This research aimed to predict the occurrence of mass movements in the aqueduct network of Palacé, in the municipality of Popayan (Colombia). We evaluated the quality of SRTM and ASTER digital terrain models by comparing them with contour lines using a map scale of 1: 25000. The landscape parameters derived from the SRTM-DEM were analyzed with a multivariate procedure using algorithms implemented in free software, along with thematic information of the study area (coverage, distance to faults, rivers and precipitation). We selected non-redundant variables with the non-parametric ACP technique, and obtained a susceptibility prediction model using logistic regression, with two types of variables: dependent (landslides inventory from field observation) and independent (slope, slope length factor, topographic wetness index, flow path length, soil units and rate of convergence) resulting in a susceptibility map, reclassified into categories according to the values of probability. The prediction model could not be quantitatively assessed because of the absence of studies with a semi-detailed scale, but the estimation of the mean square error of elevation, from which the terrain parameters were derived, the level of detail and the performance of the classifier with ROC curve, yielded a zoning consistent with the findings of the field visits.
Highlights
Landslides are complex natural processes that constitute a serious natural hazard in mountainous countries (Malamud et al, 2004)
Under the premise that future movements will occur under similar geo-environmental conditions that originated past events (Carrara et al, 1991), the inventory of landslide processes is essential for precisely identifying the locations and properties of previous landslides and determining the factors needed to predict future ones. 23 landslide processes were identified along the transmission system; 17
The result of the SRTM1” DEM and the ASTER DEM were relatively close to the results, where an average error of 18,1 m and 33,1 m was obtained (Martinez et al, 2016) in a study area containing the region of this analysis
Summary
Landslides are complex natural processes that constitute a serious natural hazard in mountainous countries (Malamud et al, 2004). This term includes a wide variety of slope movements, such as soil landslides, deep landslides, mud flows, debris flows, and falling rocks, among others (Cruden et al, 1996). Inventories of landslides are the simplest form of landslide mapping (Guzzetti et al, 2000). An inventory map registers the type and position of mass movements, leaving discernible signs in the landscape. How to cite: Correa-Muñoz, N.A., and Higidio-Castro, J.F. Determination of landslide susceptibility in linear infrastructure. Case: aqueduct network in Palacé, Popayan (Colombia).
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