Sensitivity Analysis on GIS Procedures for the Estimate of Soil Erosion Risk
关键词: Surface runoff 、 Sediment 、 Land degradation 、 Terrain 、 Hydrology 、 Erosion 、 Natural hazard 、 Sediment transport 、 Environmental science 、 Geographic information system
摘要: Land degradation by water erosion is one of the majorissues in field environmental planning. Soilerosion and sediment transport are spatiallydistributed processes, their evaluation can beeasily realised means use GeographicInformation Systems. The greater availability ofdigital geo-lithological data managed storedinside GIS has implied development techniquesand procedures aimed at definition spatialprediction deposition rates across acatchment. In this paper using terrain measuredon an experimental basin southern Italy, asensitivity analysis on different GIS-basedmethodologies for estimate a Length-Slope factorhas been developed with aim determining whichof these more reliable spatial riskassessment. Specifically, unit stream powertheory, estimates shown, depending thescheme adopted to represent hydrological andtopographic three-dimensional effects inside theLength-Slope factor. performances theprocedures analysed have evaluated through theinformation content corresponding spatialdistributions, estimated as entropy measure. Theresults obtained shown that among approachesutilised describe routing surface runoffalong hillslope profiles, two-dimensionalscheme appeared be realistic both divergingand converging surfaces. Such scheme, during thecomputational phases also distinguishing areasof experiencing net from those areasexperiencing deposition, resulted, being inaccordance on-site investigations.
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