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Prediction of river bank erosion and protection works in a reach of Chenab River, Pakistan

  • Muhammad Ashraf
  • Abdul Sattar Shakir
Original Paper
  • 101 Downloads

Abstract

The impacts of floods on river bank erosion are generally significant in the alluvial river reaches. This paper presents the prediction of the river bank erosion along the right bank in the reach of Chenab River (starting from downstream of Marala Barrage) where excessive erosion had been reported. The bank erosion is predicted due to flow/flood events of 2010 by coupling the output from the two-dimensional numerical model to the excess shear stress approach. The predicted bank erosion was compared with the one estimated from Landsat images. The Landsat ETM+ images were processed in the ArcGIS software to assess the external bank erosion. The results show that the excess shear stress approach underpredicts the bank erosion. Therefore, the erodibility coefficient was modified by forcing the best agreement between predicted and estimated (i.e., from Landsat images) bank erosion which was used for further analysis. The results reveal that coupling the output from the numerical model to the excess shear stress approach (by modifying the erodibility coefficient) predicts the river bank erosion with a reasonable level of accuracy, thus helpful to identify the locations for the protection works. The predicted river bank erosion presents good coefficient of determination (R2) of 0.82 when compared with the estimated bank erosion from Landsat images. The findings of the present study will help to implement the river protection works at the identified locations in the selected reach of River Chenab and will also act as a guideline for similar river reaches.

Keywords

River bank erosion Landsat images Excess shear stress Erodibility coefficient 

Notes

Acknowledgements

This study was financially supported by the Higher Education Commission (HEC) of Pakistan within the framework of the Indigenous PhD fellowship Program. The financial support by HEC and institutional support by University of Engineering and Technology Lahore is gratefully acknowledged and appreciated. The authors also extend their thanks to the Punjab Irrigation Department (PID) for providing their survey and flow data. The paper greatly benefitted from the thorough reviews of anonymous referees.

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Copyright information

© Saudi Society for Geosciences 2018

Authors and Affiliations

  1. 1.Centre of Excellence in Water Resources Engineering (CEWRE)University of Engineering & TechnologyLahorePakistan
  2. 2.Civil Engineering DepartmentUniversity of Engineering & TechnologyLahorePakistan

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