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Swiss Journal of Geosciences

, Volume 111, Issue 1–2, pp 191–204 | Cite as

Knickpoints along the upper Indus River, Pakistan: an exploratory survey of geomorphic processes

  • Muhammad F. Ahmed
  • J. David Rogers
  • Elamin H. Ismail
Article
  • 140 Downloads

Abstract

This article summarizes an exploratory study carried out to investigate the significance of various geomorphic features on the formation of observed knickpoints along the upper Indus River in northern Pakistan. These features include bedrock lithology, active faults, sediment flux from tributary channels, and landslide dams which have blocked the main channel. The knickpoints and their related geomorphic parameters (channel profile, concavity, drainage area and normalized steepness index, etc.) were extracted from Advanced Spaceborne Thermal Emission and Reflection (ASTER) Global Digital Elevation Models (GDEMs) with 30 m resolution using ArcGIS, River Tools, and Matlab software. A total of 251 major and minor knickpoints were extracted from the longitudinal profile along a ~ 750 km reach upstream of Tarbela Reservoir. The identified knickpoints and their respective normalized steepness index (ksn values) were compared with bedrock lithology, mapped faults, regional landslide/rockslide inventory, and the locations of historic landslide dams. The analyses revealed that the knickpoints do not correlate with the bedrock lithology except where major unit boundaries coexist with mapped faults, especially in reaches criss-crossed by active thrust faults in the Nanga Parbat Haramosh (NPHM) region. Neither did the river’s major confluences exhibit any notable knickpoints, but the correlations between knickpoints, mapped landslides, and historic rockslide avalanche dams accounted for approximately 75% of the observed knickpoints, a surprising finding. These observations suggest that more detailed studies aided by high resolution data should be undertaken to further explore the characteristics of knickpoints triggered by tectonic uplift, local fault offset, bedrock erodibility, and landslide/rockslide dams.

Keywords

Indus River Landslide dam Lithology Knickpoint DEM Longitudinal profile 

Notes

Acknowledgements

The authors are thankful to Natural Hazards Mitigation Institute at the Missouri University of Science and Technology in Rolla, MO, USA, for providing an opportunity to accomplish this work. The authors would also like to thank University of Engineering and Technology, Lahore, Pakistan for financial support to one of the authors to conduct this research.

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Copyright information

© Swiss Geological Society 2017

Authors and Affiliations

  • Muhammad F. Ahmed
    • 1
  • J. David Rogers
    • 2
  • Elamin H. Ismail
    • 2
  1. 1.Department of Geological EngineeringUniversity of Engineering and TechnologyLahorePakistan
  2. 2.Department of Geosciences and Geological and Petroleum EngineeringMissouri University of Science and TechnologyRollaUSA

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