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Modelling potential debris flows on soil covered catchment areas along the Upper Chama River Basin, Northwestern Venezuela

Mora, Rengifo Zenon Ortega
Master thesis
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ortega_thesis.pdf (15.88Mb)
Year
2007
Permanent link
http://urn.nb.no/URN:NBN:no-19226

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  • Institutt for geofag [752]
Abstract
Debris flows in the Venezuelan Andes are common geomorphologic processes that reflect the sediment supply capacity of this regional mountain system. In this study a regional model for potential debris flows on soil and vegetation-covered hillslopes, in watershed domains is presented. The method used in this investigation is a combination of remote sensing techniques, morphometric and hydrologic parameters. The study area is the Upper Chama River Watershed,North-western Venezuela. The input data is an ASTER scene and SRTM3-DEM.

The main focus is the modelling of source, runout and deposition areas for potential debris flows, as a function of topography and sediment dynamics. This goal is reached by implementing the Distributed Melton´s Ruggedness Number(DMRN) and the Modified Single Flow Model (MSFM), develop by Huggel et al. 2003. Complementary, a level I land cover classification is carried out. It aims to investigate the relationship between vegetation, high DMRN and the frequency of

occurrence of debris flows in study area.
 
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