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| Titel |
Landslide susceptibility near highways is increased by 1 order of magnitude in the Andes of southern Ecuador, Loja province |
| VerfasserIn |
A. Brenning, M. Schwinn, A. P. Ruiz-Páez, J. Muenchow |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Sciences ; 15, no. 1 ; Nr. 15, no. 1 (2015-01-07), S.45-57 |
| Datensatznummer |
250119271
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| Publikation (Nr.) |
 copernicus.org/nhess-15-45-2015.pdf |
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| Zusammenfassung |
| Mountain roads in developing countries are known to increase landslide
occurrence due to often inadequate drainage systems and mechanical
destabilization of hillslopes by undercutting and overloading. This study
empirically investigates landslide initiation frequency along two paved
interurban highways in the tropical Andes of southern Ecuador across
different climatic regimes. Generalized additive models (GAM) and
generalized linear models (GLM) were used to analyze the relationship
between mapped landslide initiation points and distance to highway while
accounting for topographic, climatic, and geological predictors as possible
confounders. A spatial block bootstrap was used to obtain nonparametric
confidence intervals for the odds ratio of landslide occurrence near the
highways (25 m distance) compared to a 200 m distance. The estimated odds
ratio was 18–21, with lower 95% confidence bounds >13 in all
analyses. Spatial bootstrap estimation using the GAM supports the higher
odds ratio estimate of 21.2 (95% confidence interval: 15.5–25.3). The
highway-related effects were observed to fade at about 150 m distance. Road
effects appear to be enhanced in geological units characterized by Holocene
gravels and Laramide andesite/basalt. Overall, landslide susceptibility was
found to be more than 1 order of magnitude higher in close proximity to
paved interurban highways in the Andes of southern Ecuador. |
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