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Application of hydrological indices for erosion hazard mapping using Spatial Analyst tool

  • Imran Ahmad
  • Mithas Ahmad DarEmail author
  • Afera Halefom Teka
  • Tesfa Gebre
  • Ebissa Gadissa
  • Asirat Teshome Tolosa
Article
  • 125 Downloads

Abstract

Hydrological indices provide excellent input to geographic information systems for the successful mapping of erosion-prone areas. In this research, a digital elevation model was processed and analyzed to obtain the necessary hydrological indices necessary for erosion modeling. The indices (such as sediment transport index, compound topography index, and stream power index) along with other themes (Like Slope gradient, curvature, distance to channels, and channel density) were overlaid using the “Weighted Sum” overlay tool in the geographic information system. The results showed that 33.14 km2 of the test watershed (sub-basin of Abay, Ethiopia) falls in very high/severe erosion zone and needs immediate conservation measures. A total of 98.26 km2, 153.40 km2, and 263.17 km2 fall in high-, moderate-, and low-erosion hazard zones, respectively. Therefore, the primary and secondary derivatives of the digital elevation model along with morphometric parameters coupled with a Spatial Analyst tool proves to be a powerful integrated approach in demarcating erosion vulnerable zones and could be applied at regional and continental scale for proper watershed management.

Keywords

Abay basin Erosion modeling Hydrologic indices Sediment transport index Stream power index 

Notes

References

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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.Department of Hydraulic and Water Resources EngineeringDebre Tabor UniversityDebre TaborEthiopia
  2. 2.Department for Management of Science and Technology DevelopmentTon Duc Thang UniversityHo Chi Minh CityVietnam
  3. 3.Faculty of Environment and Labour SafetyTon Duc Thang UniversityHo Chi Minh CityVietnam

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