Utilização de métodos de representação espacial para cálculo do fator topográfico na equação universal de perda de solo revisada em bacias hidrográficas

Translated title of the contribution: Use of spatial representation to calculate the topographic factor in the revised universal soil loss equation in watersheds

Jean Paolo Gomes Minella, Gustavo Henrique Merten, Anderson Luis Ruhoff

Research output: Contribution to journalComment/debatepeer-review

8 Scopus citations

Abstract

Methods of spatial representation to calculate the topographic factor (LS) of the Revised Universal Soil Loss Equation (USLE) have been used to estimate soil erosion and sediment yield of watersheds. These procedures are based on equations traditionally used to determine the LS factor and information that characterize the hillslope forms and processes, derived from the Digital Elevation Model (DEM). Two computational methods commonly used to calculate LS factor in soil erosion and sediment yield models were analyzed in this study. The analysis was performed in four small rural watersheds with hilly terrain. The LS values obtained by the methods of spatial representation were compared with each other with LS values measured by the traditional method. Results show significant differences of the computergenerated LS values, which were related to the calculation procedure and the method used to determine the DEM flow direction. Differences were also observed between the numeric values of the LS factor determined by methods of spatial representation and in the field.

Translated title of the contributionUse of spatial representation to calculate the topographic factor in the revised universal soil loss equation in watersheds
Original languagePortuguese
Pages (from-to)1455-1462
Number of pages8
JournalRevista Brasileira de Ciencia do Solo
Volume34
Issue number4
DOIs
StatePublished - 2010

Keywords

  • Geographic information systems
  • Hillslope erosion
  • Numeric terrain modeling
  • Revised universal soil loss equation
  • Sediment yield

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