Assessment and mapping of debris-flow risk in a small catchment in eastern Sicily through integrated numerical simulations and GIS

Abstract This paper describes the application of a methodology for the evaluation of debris-flow risk in alluvial fans by incorporating numerical simulations with Geographical Information Systems to identify potential debris-flow hazard areas. The methodology was applied to a small catchment located in the north-eastern part of Sicily, Italy where an extreme debris flow event occurred in October 2007. The adopted approach integrates a slope stability model that identifies the areas of potential shallow landslides under different meteorological conditions using a two-dimensional finite-element model based on the De Saint Venant equation for the debris-flow propagation. The mechanical properties of the debris were defined using both laboratory and in situ test results. The risk classification of the area under study was derived using total hydrodynamic force per unit width ( impact pressure ) as an indicator for event intensity. Based on the simulation results, a potential risk zone was identified and mapped.

[1]  William E. Dietrich,et al.  Validation of the Shallow Landslide Model, SHALSTAB, for Forest Management , 2013 .

[2]  Richard M. Iverson,et al.  Landslide triggering by rain infiltration , 2000 .

[3]  Melvin J. Dubnick.  Army Corps of Engineers , 1998 .

[4]  Roberto Santacroce,et al.  Characteristics of May 5–6, 1998 volcaniclastic debris flows in the Sarno area (Campania, southern Italy): relationships to structural damage and hazard zonation , 2004 .

[5]  W. Megahan,et al.  Hydrologic effects of clearcutting and wildfire on steep granitic slopes in Idaho , 1983 .

[6]  Claudio Margottini,et al.  Large scale debris-flow hazard assessment: a geotechnical approach and GIS modelling , 2003 .

[7]  K. M. de Bruijn,et al.  EVOLVING CONCEPTS IN FLOOD RISK MANAGEMENT: SEARCHING FOR A COMMON LANGUAGE , 2007 .

[8]  David R. Montgomery,et al.  A process-based model for colluvial soil depth and shallow landsliding using digital elevation data , 1995 .

[9]  Floyd A. Huff,et al.  Time distribution of rainfall in heavy storms , 1967 .

[10]  Stefano Mambretti,et al.  Assessment of debris flow magnitude in small catchments of the Lombardy Alps: the Val Gola case study. , 2011 .

[11]  R. Bagnold.  Experiments on a gravity-free dispersion of large solid spheres in a Newtonian fluid under shear , 1954, Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences.

[12]  P. Reichenbach,et al.  Regional hydrological thresholds for landslides and floods in the Tiber River Basin (central Italy) , 1998 .

[13]  Valeria Lupiano,et al.  Debris-flow susceptibility assessment through cellular automata modeling: an example from 15–16 December 1999 disaster at Cervinara and San Martino Valle Caudina (Campania, southern Italy) , 2003 .

[14]  Renzo Rosso,et al.  A physically based model for the hydrologic control on shallow landsliding , 2006 .

[15]  B. Riley,et al.  EMERGENCY MANAGEMENT AGENCY , 2009 .

[16]  B. Merz,et al.  Flood Risk Mapping At The Local Scale: Concepts and Challenges , 2007 .

[17]  David B. Walden,et al.  Report of the Secretary-General , 1989 .

[18]  Heiko Apel,et al.  Flood risk analyses—how detailed do we need to be? , 2009 .

[19]  G. Wieczorek,et al.  Effect of rainfall intensity and duration on debris flows in central Santa Cruz Mountains, California , 1987 .

[20]  Thomas Glade,et al.  Climatic factors influencing occurrence of debris flows , 2005 .

[21]  D. Montgomery,et al.  A physically based model for the topographic control on shallow landsliding , 1994 .

[22]  Francesco Gentile,et al.  Debris-flow risk analysis in south Gargano watersheds (Southern-Italy) , 2008 .

[23]  Bruno Merz,et al.  A Probabilistic Modelling System for Assessing Flood Risks , 2006 .

[24]  G. Wieczorek,et al.  Rainfall Thresholds for the Initiation of Debris Flows at La Honda, California , 1995 .

[25]  Philippe Coussot,et al.  Numerical modeling of mudflows , 1997 .

[26]  Pilar García-Navarro,et al.  1D Mathematical modelling of debris flow , 2000 .

[27]  Thomas Glade,et al.  Applying Probability Determination to Refine Landslide-triggering Rainfall Thresholds Using an Empirical “Antecedent Daily Rainfall Model” , 2000 .

[28]  Peter Rutschmann,et al.  Comparison of flow resistance relations for debris flows using a one-dimensional finite element simulation model , 2006 .

[29]  G Aronica,et al.  Hydrological and hydraulic analysis of the flash flood event on 25 October 2007 in North-Eastern part of Sicily, Italy , 2008 .

[30]  B. Merz,et al.  Flood-risk mapping: contributions towards an enhanced assessment of extreme events and associated risks , 2006 .

[31]  Torsten Schaub,et al.  The variability of root cohesion as an influence on shallow landslide susceptibility in the Oregon Coast Range , 2001 .

[32]  M. Maugeri,et al.  Seismic response of saturated cohesionless slopes , 2000 .

[33]  B. Calvo,et al.  A real-world application of Monte Carlo procedure for debris flow risk assessment , 2009, Comput. Geosci..

[34]  P. Julien,et al.  Two‐Dimensional Water Flood and Mudflow Simulation , 1993 .

[35]  Giuseppe T. Aronica,et al.  2D Multilevel Model for Flood Wave Propagation in Flood-Affected Areas , 1998 .

[36]  Giovanni B. Crosta,et al.  Distributed modelling of shallow landslides triggered by intense rainfall , 2003 .

[37]  Pietro Aleotti,et al.  A warning system for rainfall-induced shallow failures , 2004 .

[38]  R. Sidle,et al.  A distributed slope stability model for steep forested basins , 1995 .

[39]  D. Montgomery,et al.  Analysis of Erosion Thresholds, Channel Networks, and Landscape Morphology Using a Digital Terrain Model , 1993, The Journal of Geology.

[40]  D. Montgomery,et al.  Erosion thresholds and land surface morphology , 1992 .

[41]  P. M. Santi,et al.  Debris-flow impact , vulnerability , and response , 2011 .

[42]  Fausto Guzzetti,et al.  Rainfall thresholds for the possible occurrence of landslides in Italy , 2010 .

[43]  M. Maugeri,et al.  Flow and deformation failure of sandy slopes , 2002 .

[44]  Alberto Lamberti,et al.  ASSESSMENT OF RISK DUE TO DEBRIS FLOW EVENTS , 2003 .

[45]  V. Perrone,et al.  Calabria-Peloritani terrane and northern Ionian Sea , 2001 .