Next Article in Journal
Effective Drought Communication: Using the Past to Assess the Present and Anticipate the Future
Next Article in Special Issue
Developing Real-Time Nowcasting System for Regional Landslide Hazard Assessment under Extreme Rainfall Events
Previous Article in Journal / Special Issue
Framework of Emergency Response System for Potential Large-Scale Landslide in Taiwan
Article

Incorporating the Effects of Complex Soil Layering and Thickness Local Variability into Distributed Landslide Susceptibility Assessments

1
Department of Earth, Environment and Resources Science, University of Naples Federico II, 80126 Naples, Italy
2
U.S. Geological Survey, Landslide Hazards Program, Golden, CO 80401, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Matjaž Mikoš
Water 2021, 13(5), 713; https://doi.org/10.3390/w13050713
Received: 29 December 2020 / Revised: 6 February 2021 / Accepted: 2 March 2021 / Published: 5 March 2021
(This article belongs to the Special Issue Rainfall-Induced Shallow Landslides Modeling and Warning)
Incorporating the influence of soil layering and local variability into the parameterizations of physics-based numerical models for distributed landslide susceptibility assessments remains a challenge. Typical applications employ substantial simplifications including homogeneous soil units and soil-hydraulic properties assigned based only on average textural classifications; the potential impact of these assumptions is usually disregarded. We present a multi-scale approach for parameterizing the distributed Transient Rainfall Infiltration and Grid-Based Regional Slope-Stability (TRIGRS) model that accounts for site-specific spatial variations in both soil thickness and complex layering properties by defining homogeneous soil properties that vary spatially for each model grid cell. These effective properties allow TRIGRS to accurately simulate the timing and distribution of slope failures without any modification of the model structure. We implemented this approach for the carbonate ridge of Sarno Mountains (southern Italy) whose slopes are mantled by complex layered soils of pyroclastic origin. The urbanized foot slopes enveloping these mountains are among the most landslide-prone areas of Italy and have been subjected to repeated occurrences of damaging and deadly rainfall-induced flow-type shallow landslides. At this scope, a primary local-scale application of TRIGRS was calibrated on physics-based rainfall thresholds, previously determined by a coupled VS2D (version 1.3) hydrological modeling and slope stability analysis. Subsequently, by taking into account the spatial distribution of soil thickness and vertical heterogeneity of soil hydrological and mechanical properties, a distributed assessment of landslide hazard was carried out by means of TRIGRS. The combination of these approaches led to the spatial assessment of landslide hazard under different hypothetical rainfall intensities and antecedent hydrological conditions. This approach to parameterizing TRIGRS can be adapted to other spatially variable soil layering and thickness to improve hazard assessments. View Full-Text
Keywords: debris flow hazard; ash-fall pyroclastic soils; layered soils; scaling; hydrological modeling; early-warning system; susceptibility maps debris flow hazard; ash-fall pyroclastic soils; layered soils; scaling; hydrological modeling; early-warning system; susceptibility maps
Show Figures

Figure 1

MDPI and ACS Style

Fusco, F.; Mirus, B.B.; Baum, R.L.; Calcaterra, D.; De Vita, P. Incorporating the Effects of Complex Soil Layering and Thickness Local Variability into Distributed Landslide Susceptibility Assessments. Water 2021, 13, 713. https://doi.org/10.3390/w13050713

AMA Style

Fusco F, Mirus BB, Baum RL, Calcaterra D, De Vita P. Incorporating the Effects of Complex Soil Layering and Thickness Local Variability into Distributed Landslide Susceptibility Assessments. Water. 2021; 13(5):713. https://doi.org/10.3390/w13050713

Chicago/Turabian Style

Fusco, Francesco, Benjamin B. Mirus, Rex L. Baum, Domenico Calcaterra, and Pantaleone De Vita. 2021. "Incorporating the Effects of Complex Soil Layering and Thickness Local Variability into Distributed Landslide Susceptibility Assessments" Water 13, no. 5: 713. https://doi.org/10.3390/w13050713

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop