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Assessment of Topographical Factor (LS-Factor) Estimation Procedures in a Gently Sloping Terrain

  • P. R. Anjitha KrishnaEmail author
  • R. Lalitha
  • K. Shanmugasundaram
  • M. Nagarajan
Research Article

Abstract

The major uncertainty in soil erosion assessment studies is derived from LS-factor constituting slope length and slope steepness factors. Empirical soil erosion models employing different algorithms for estimation of LS-factor using raster-based digital elevation models (DEMs). Different algorithms have been adopted for LS-factor determination in soil erosion studies without proper justification for their selection according to the terrain characteristics; a few among them addressed suitability of the algorithms on hilly terrains. The present study focused on the performance of LS-factor estimation methods involving specific contributing area (SCA) method and cumulative slope length method for slope length factor and USLE, RUSLE and USPED algorithms for slope steepness factor in a gently sloping terrain. The results showed that SCA method is the best performing method in gently sloping terrain since the effect of contour length exponent get minimized since there are less influence from diagonal flow direction. The pixel-to-pixel-based slope length exponent may result in more appropriate estimation of slope length factor in gently sloping terrains. The SCA-based slope length estimation along with USLE S-factor algorithm was found to perform well under different elevation classes and slope classes in both SRTM DEM and ASTER DEM. The results from the study may be helpful in appropriate prediction of soil erosion in gently sloping terrains.

Keywords

Soil erosion Slope length factor SRTM ASTER SCA CSL 

Notes

References

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Copyright information

© Indian Society of Remote Sensing 2019

Authors and Affiliations

  • P. R. Anjitha Krishna
    • 1
    • 3
    Email author
  • R. Lalitha
    • 1
  • K. Shanmugasundaram
    • 1
  • M. Nagarajan
    • 2
  1. 1.Department of Soil and Water Conservation Engineering and Agricultural StructuresAEC&RI, TNAUKumulur, TrichyIndia
  2. 2.Soil and Water Management Research InstituteKattuthottam, ThanjavurIndia
  3. 3.Department of Soil and Water EngineeringCAE, UASRaichurIndia

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