Evaluating the influence of forest roads on shallow landsliding |
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| Institution: | 1. Department of Land and AgroForest Environments, AGRIPOLIS, University of Padova, via dell’Università, 16, Legnaro, IT-35020, Italy;2. Department of Agricultural and Environmental Science, Polo Scientifico Rizzi, University of Udine, IT-33100 Udine, Italy;1. Department of Geography, University of Alabama, Tuscaloosa, AL 35487, United States;2. Institute for the Environment, University of North Carolina, Chapel Hill, NC 27517, United States;3. Department of Biology, University of Alabama, Tuscaloosa, AL 35487, United States;4. Department of Physical and Life Sciences, Nevada State College, Henderson, NV 89002, United States;1. Department of Civil and Environmental Engineering, The Pennsylvania State University, 406 Sackett Building, University Park, PA 16802, USA;2. Department of Computer Science and Engineering, The Pennsylvania State University, University Park, PA 16802, USA;3. Department of Landscape Architecture, The Pennsylvania State University, University Park, PA 16802, USA;1. Road Management Division, Seoul Metropolitan Government, South Korea;2. Department of Civil Engineering, Seoul National University of Science & Technology, South Korea;1. College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, China;2. College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China;3. Key Laboratory of Karst Dynamics by MLR & Guangxi of PRC, IRCK by UNESCO, Guilin 541004, China;4. Department of Food, Agricultural and Biological Engineering, Ohio State University, Columbus 43210, USA;1. University of Wyoming, Department of Anthropology, 1000 E. University Ave, Laramie, WY, USA;2. Bureau of Land Management, Denver, CO, USA |
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| Abstract: | This study investigates how subsurface flowpaths are altered by forest roads and how these changes influence shallow landsliding susceptibility in steep, forested landscape. A simple conceptual model of the effect of forest roads on hillslope subsurface flow is developed. The model is incorporated into a hydro-geomechanical, threshold-based model for slope instability. In the model, the occurrence of shallow landsliding is evaluated in terms of drainage areas, ground slope and soil properties (i.e., hydraulic conductivity, bulk density, and friction angle). Model results allow to quantify the influence of roads on shallow landsliding hazard across a landscape and to generate hypotheses about the broader geomorphic effect of roads.Modelling results are compared with field data collected in four sites located in north-eastern Italy. Observed landslide patterns are broadly consistent with model estimates, a finding that underscores the utility of this simple approach for predicting the geomorphic effects of forest roads constructed on steep slopes. The approach used in this study may be useful for defining criteria for road design that reduce the effects of roads on geomorphic processes. |
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