A new modelling approach to delineate the spatial extent of alpine sediment cascades : GIS and SDA applications in geomorphology

The delineation of sediment cascades in alpine geosystems requires the identification and localisation of the effective geomorphic processes. In order to classify the terrain on that basis, modelling approaches originally designed for natural hazard zonation were extended. Four sub-models are used to simulate geomorphic processes: (1) potential initiation sites, (2) process pathways, (3) run-out distances and (4) geomorphic activity (erosion, transport and deposition areas). By overlaying the datasets comprising the spatial extent of geomorphic activity, a map of geomorphic process units, i.e. a map with units of homogeneous process composition can be generated. As the modelling of process pathways includes a topology of process links, the map can be used to address several geomorphologic problems, e.g. process interaction, sediment routing, hillslope-channel coupling and the identification of areas of predominant erosion and deposition (sediment storages). This paper presents the design of the modelling approach and selected results of rockfall, slope-type and torrent bed-type debris flow modelling in an alpine basin Lahnenwiesgraben) in the Northern Limestone Alps, Germany.

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

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

[3]  Anders Rapp,et al.  Recent Development of Mountain Slopes in Kärkevagge and Surroundings, Northern Scandinavia , 1960 .

[4]  O. Slaymaker.  Mountain geomorphology: A theoretical framework for measurement programmes , 1991 .

[5]  Barbara A. Kennedy,et al.  Physical geography: A systems approach , 1971 .

[6]  G. Plaßmann.  The International Journal of Sustainable Development and World Ecology. , 1994 .

[7]  Olav Slaymaker,et al.  The distinctive attributes of debris torrents , 1988 .

[8]  G. D. Fontana,et al.  GIS indicators for sediment sources study in Alpine basins , 1998 .

[9]  M. Becht.  Untersuchungen zur aktuellen Reliefentwicklung in alpinen Einzugsgebieten , 1995 .

[10]  F. Pergalani,et al.  Slope Instability Zonation: a Comparison Between Certainty Factor and Fuzzy Dempster–Shafer Approaches , 1998 .

[11]  N. Preston,et al.  Modelling sediment fluxes at large spatial and temporal scales , 2003 .

[12]  Andrea G. Fabbri,et al.  Validation of Spatial Prediction Models for Landslide Hazard Mapping , 2003 .

[13]  E. Foufoula‐Georgiou,et al.  Channel network source representation using digital elevation models , 1993 .

[14]  Michael Becht,et al.  Sediment transport by avalanches in the Bavarian Alps revisited - a perspective on modelling , 2005 .

[15]  G. D. Fontana,et al.  Slope–area relationships and sediment dynamics in two alpine streams , 2003 .

[16]  Volker Wichmann,et al.  Modellierung geomorphologischer Prozesse in einem alpinen Einzugsgebiet : Abgrenzung und Klassifizierung der Wirkungsräume von Sturzprozessen und Muren mit einem GIS , 2006 .

[17]  A. C. Seijmonsbergen,et al.  Comparison of three Gis-based models for predicting rockfall runout , 2003 .

[18]  Lothar Schrott,et al.  Spatial distribution of sediment storage types and quantification of valley fill deposits in an alpine basin, Reintal, Bavarian Alps, Germany , 2003 .

[19]  Michael Becht,et al.  Statistical disposition modelling of mass movements , 2006 .

[20]  Thomas Glade,et al.  Linking debris-flow hazard assessments with geomorphology , 2005 .

[21]  D. Mcclung,et al.  A Two–Parameter Model of Snow–Avalanche Motion , 1980, Journal of Glaciology.

[22]  Michael Becht,et al.  Modeling of geomorphic processes in an alpine catchment , 2005 .

[23]  P. Giles,et al.  Geomorphological signatures: classification of aggregated slope unit objects from digital elevation and remote sensing data , 1998 .

[24]  D. Scherer,et al.  Identification of geomorphic process units in kärkevagge, northern sweden, by remote sensing and digital terrain analysis , 2002 .

[25]  Adrian E. Scheidegger,et al.  Physical aspects of natural catastrophes , 1975 .

[26]  Luciano Broilli.  Ein Felssturz im Großversuch , 1974 .

[27]  M. Becht,et al.  Investigating Sediment Cascades Using Field Measurements and Spatial Modelling , 2005 .