[en] Despite the availability of studies on the frequency density of landslide areas in mountainous regions, frequency-area distributions of historical landslide inventories in populated hilly regions are absent. This study revealed that the frequency-area distribution derived from a detailed landslide inventory of the Flemish Ardennes (Belgium) is significantly different from distributions usually obtained in mountainous areas where landslides are triggered by large-scale natural causal factors such as rainfall, earthquakes or rapid snowmelt. Instead, the landslide inventory consists of the superposition of two populations, i.e. (i) small (<1-2 . 10(-2) km(2)), shallow complex earth slides that are at most 30 yr old, and (ii) large (> 1-2 . 10(-2) km(2)), deep-seated landslides that are older than 100 yr. Both subpopulations are best represented by a negative power-law relation with exponents of -0.58 and -2.31 respectively. This study focused on the negative power-law relation obtained for recent, small landslides, and contributes to the understanding of frequency distributions of landslide areas by presenting a conceptual model explaining this negative power-law relation for small landslides in populated hilly regions. According to the model hilly regions can be relatively stable under the present-day environmental conditions, and landslides are mainly triggered by human activities that have only a local impact on slope stability. Therefore, landslides caused by anthropogenic triggers are limited in size, and the number of landslides decreases with landslide area. The frequency density of landslide areas for old landslides is similar to those obtained for historical inventories compiled in mountainous areas, as apart from the negative power-law relation with exponent -2.31 for large landslides, a positive power-law relation followed by a rollover is observed for smaller landslides. However, when analysing the old landslides together with the more recent ones, the present-day higher temporal frequency of small landslides compared to large landslides, obscures the positive power-law relation and rollover. (C) 2007 Elsevier B.V. All rights reserved.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Van den Eeckhaut, M.
Poesen, J.
Govers, G.
Verstraeten, G.
Demoulin, Alain ; Université de Liège - ULiège > Département de géographie > Unité de géographie physique et quaternaire (UGPQ)
Language :
English
Title :
Characteristics of the size distribution of recent and historical landslides in a populated hilly region
Ost L., Van Den Eeckhaut M., Poesen J., and Vanmaercke-Gottigny M.C. Characteristics and spatial distribution of large landslides in the Flemish Ardennes (Belgium). Z. Geomorphol. 47 (2003) 329-350
Van Den Eeckhaut M., Poesen J., Verstraeten G., Vanacker V., Moeyersons J., Nyssen J., and Van Beek L.P.H. The effectiveness of hillshade maps and expert knowledge in mapping old deep-seated landslides. Geomorphology 67 (2005) 351-363
M. Van Den Eeckhaut, J. Poesen, G. Verstraeten, V. Van Acker, J. Nyssen, J. Moeyersons, L.P.H. Van Beek, L. Vandekerckhove, The use of LIDAR-derived images for mapping old landslides under forest. Earth Surf. Processes Landf (in press).
Van Den Eeckhaut M., Vanwalleghem T., Poesen J., Govers G., and Verstraeten G. Prediction of landslide susceptibility using rare events logistic regression: a case-study in the Flemish Ardennes (Belgium). Geomorphology 76 (2006) 392-410
M. Van Den Eeckhaut, 2006. Spatial and temporal patterns of landslides in hilly regions - the Flemish Ardennes (Belgium). PhD Thesis, Faculty of Sciences, Department of Geography-Geology, K. U. Leuven, Belgium, ISBN 90-8649-010-7, pp. 250.
M. Van Den Eeckhaut, J. Poesen, O. Dewitte, A. Demoulin, H. De Bo, M.C. Vanmaercke-Gottigny, Reactivation of old landslides: lessons learned from a case-study in the Flemish Ardennes (Belgium), Soil Use and Management (in press).
Hovius N., Stark C.P., and Allen P.A. Sediment flux from a mountain belt derived by landslide mapping. Geology 25 (1997) 231-234
Pelletier J.D., Malamud B.D., Blodgett T., and Turcotte D.L. Scale-invariance of soil moisture variability and its implications for the frequency-size distributions of landslides. Eng. Geol. 48 (1997) 255-268
Malamud B.D., and Turcotte D.L. Self-organized criticality applied to natural hazards. Nat. Hazards 20 (1999) 93-116
Hovius N., Stark C.P., Hao-Tsu C., and Jiun-Chuan L. Supply and removal of sediment in a landslide-dominated mountain belt: Central Range, Taiwan. J. Geol. 108 (2000) 73-89
Stark C.P., and Hovius N. The characterisation of landslide size distributions. Geophys. Res. Lett. 28 (2001) 1091-1094
Martin Y., Rood K., Schwab J.W., and Church M. Sediment transfer by shallow landslides in the Queen Charlotte Islands, British Columbia. Can. J. Earth Sci. 39 (2002) 189-205
Guzzetti F., Malamud B.D., Turcotte D.L., and Reichenbach P. Power-law correlations of landslide areas in central Italy. Earth Planet. Sci. Lett. 195 (2002) 169-183
Crosta G.B., Negro P.D., and Frattini P. Soil slips and debris flows on terraced slopes. Nat. Hazards Earth Syst. Sci. 3 (2003) 31-42
Iwahashi J., Watanabe S., and Furuya T. Mean slope-angle frequency distribution and size frequency distribution of landslide masses in Higashikubiki area, Japan. Geomorphology 50 4 (2003) 349-364
Guthrie R.H., and Evans S.G. Analysis of landslide frequencies and characteristics in a natural system, coastal British Columbia. Earth Surf. Processes Landf. 29 (2004) 1321-1339
Guthrie R.H., and Evans S.G. Magnitude and frequency of landslides triggered by a storm event, Loughborough, British Columbia. Nat. Hazards Earth Syst. Sci. 4 (2004) 475-483
Brardinoni F., and Church M. Representing the landslide magnitude-frequency relation: Capilano River Basin, British Columbia. Earth Surf. Processes Landf. 29 (2004) 115-124
Malamud B.D., Turcotte D.L., Guzzetti F., and Reichenbach P. Landslide inventories and their statistical properties. Earth Surf. Processes Landf. 29 (2004) 687-711
Malamud B.D., Turcotte D.L., Guzzetti F., and Reichenbach P. Landslides, earthquakes, and erosion. Earth Planet. Sci. Lett. 229 (2004) 45-59
Korup O. Distribution of landslides in southwest New Zealand. Landslides 2 (2005) 43-51
Catani F., Casagli N., Ermini L., Righini G., and Menduni G. Landslide hazard and risk mapping at catchment scale 2005 Arno River basin. Landslides 2 4 (2005) 329-342
Katz O., and Aharonov E. Landslides in vibrating sand box: what controls types of slope failure and frequency magnitude relations?. Earth Planet. Sci. Lett. 247 (2006) 280-294
Havenith H.B., Torgoev I., Meleshko A., Alioshin Y., Torgoev A., and Danneels G. Landslides in the Mailuu-Suu Valley, Kyrgyzstan - hazards and impacts. Landslides 3 2 (2006) 137-147
Chien-Yuan C., Fan-Chieh Y., Sheng-Chi L., and Kei-Wai C. Discussion of Landslide Self-Organized Criticality and the Initiation of Debris Flow. Earth Surf. Processes Landf 32 (2007) 197-209
Bak P., Tang C., and Wiesenfield K. Self-organized critically. Phys. Rev., A 38 (1988) 364-374
Bak P., and Chen K. The physics of fractals. Physica, D 38 (1989) 5-12
Bak P. Self-organized critically. Physica, A 163 (1990) 403-409
Hergarten S. Landslides, sandpiles, and self-organized criticality. Nat. Hazards Earth Syst. Sci. 3 (2003) 505-514
Yakovlev G., Newman W.I., Turcotte D.L., and Gabrielov A. An inverse cascade model for self-organized complexity and natural hazards. Geophys. J. Int. 163 (2005) 433-442
De Vos W., Verniers J., Herbosch A., and Vanguestaine M. A new geological map of the Brabant Massif, Belgium. Geol. Mag. 130 (1993) 606-611
P. Jacobs, M. De Ceukelaire, W. De Breuck, G. De Moor, 1999, Text describing the Belgian Geological Map, Flemish Region, Map Sheet 29 Kortrijk, Map Scale 1/50 000 (in Dutch), Ministerie van Economische zaken en Ministerie van de Vlaamse Gemeenschap, Brussels, 68 pp.
P. Jacobs, V. Van Lancker, M. De Ceukelaire, W. De Breuck, G. De Moor, 1999, Text describing the Belgian Geological Map, Flemish Region, Map Sheet 30 Geraardsbergen, Map Scale 1/50 000 (in Dutch), Ministerie van Economische zaken en Ministerie van de Vlaamse Gemeenschap, Brussels, 58 pp.
I.W.O.N.L., 1987, Text clarifying the Belgian Soil Map, Map Sheet 98E Ronse (in Dutch), Uitgegeven onder de auspiciën van het Instituut tot aanmoediging van het Wetenschappelijk Onderzoek in Nijverheid en Landbouw, Brussels.
NGI (National Geographical Institute), 1972, Topographical map of Belgium (1:10 000), Sheets 29/3-4-7-8 and 30/1-2-5-6, National Geographical Institute, Brussels.
Sigrist P., Coppin P., and Hermy M. Impact of forest canopy on quality and accuracy of GPS measurements. J. Remote Sens. 20 (1999) 3595-3610
DEM of Flanders. MVG-LIN-AWZ and MVG-LIN-AMINAL (GIS-Vlaanderen) (2005). http://www.gisvlaanderen.be/gis/diensten/geo-vlaanderen/?artid=240
M. Van Den Eeckhaut, J. Poesen, G. Verstraeten, Morphology, internal structure and age of a dormant landslide under forest, the Collinabos landslide (Belgium), Geomorphology (in press).
Halet F. Glissements de terrain aux environs de Renaix. Bull. Soc. Belge Géol. 18 (1904) 161-163
M.A. Lefèvre, 1926-1927, Glissements de terrain dans les collines de Renaix, Ann. Soc. Geol. Belg. 50, 29-35.
OC-GIS Vlaanderen, 1998, Mid scale orthophoto images of map sheet 30-5, scale: 1:12,000, Ondersteunend Centrum GIS Vlaanderen, Belgium, Gent.
Evans S.G., Cruden D.M., Bobrowsky P.T., Guthrie R.H., Keegan T.R., Liverman D.G.E., and Perret D. Landslide risk assessment in Canada; a review of recent developments. In: Hungr O., Fell R., Couture R., and Eberhardt E. (Eds). Landslide Risk Management: Proceedings of the International Conference on Landslide Risk Management (2005), A.A. Balkema, Vancouver, Leiden 352-366
