Soil erosion fragility assessment using an impact model and geographic information system

dc.contributor.authorBlanco Jorge, Luiz Alberto [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-20T13:21:39Z
dc.date.available2014-05-20T13:21:39Z
dc.date.issued2009-01-01
dc.description.abstractA study was taken in a 1566 ha watershed situated in the Capivara River basin, municipality of Botucatu, São Paulo State, Brazil. This environment is fragile and can be subjected to different forms of negative impacts, among them soil erosion by water. The main objective of the research was to develop a methodology for the assessment of soil erosion fragility at the various different watershed positions, using the geographic information system ILWIS version 3.3 for Windows. An impact model was created to generate the soil's erosion fragility plan, based on four indicators of fragility to water erosion: land use and cover, slope, percentage of soil fine sand and accumulated water flow. Thematic plans were generated in a geographic information system (GIS) environment. First, all the variables, except land use and cover, were described by continuous numerical plans in a raster structure. The land use and cover plan was also represented by numerical values associated with the weights attributed to each class, starting from a pairwise comparison matrix and using the analytical hierarchy process. A final field check was done to record evidence of erosive processes in the areas indicated as presenting the highest levels of fragility, i.e., sites with steep slopes, high percentage of soil fine sand, tendency to accumulate surface water flow, and sites of pastureland. The methodology used in the environmental problems diagnosis of the study area can be employed at places with similar relief, soil and climatic conditions.en
dc.description.affiliationUNESP, FCA, Depto Recursos Nat, BR-18603970 Botucatu, SP, Brazil
dc.description.affiliationUnespUNESP, FCA, Depto Recursos Nat, BR-18603970 Botucatu, SP, Brazil
dc.format.extent658-666
dc.identifierhttp://dx.doi.org/10.1590/S0103-90162009000500011
dc.identifier.citationScientia Agricola. Cerquera Cesar: Univ Sao Paolo, v. 66, n. 5, p. 658-666, 2009.
dc.identifier.fileS0103-90162009000500011-en.pdf
dc.identifier.issn0103-9016
dc.identifier.lattes1514525962943950
dc.identifier.scieloS0103-90162009000500011
dc.identifier.urihttp://hdl.handle.net/11449/6257
dc.identifier.wosWOS:000270685300011
dc.language.isoeng
dc.publisherUniversidade de São Paulo (USP)
dc.relation.ispartofScientia Agricola
dc.relation.ispartofsjr0,578
dc.rights.accessRightsAcesso aberto
dc.sourceWeb of Science
dc.subjectwater flowen
dc.subjecthydric erosionen
dc.subjectanalytical hierarchy processen
dc.titleSoil erosion fragility assessment using an impact model and geographic information systemen
dc.title.alternativeAvaliação da fragilidade à erosão do solo por meio de um modelo de impacto e sistema de informações geográficaspt
dc.typeArtigo
dcterms.rightsHolderUniv Sao Paolo
unesp.author.lattes1514525962943950
unesp.campusUniversidade Estadual Paulista (Unesp), Faculdade de Ciências Agronômicas, Botucatupt

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