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Effect of Gradation of Bed Material on Local Scour Depth

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Abstract

The paper presents a study on local scour with respect to bed material gradation, flow depth and the Froude number. In the study, bed materials collected from five different rivers were used separately for four different shapes of the obstructions. The water discharge was also varied for each run. The experimental results obtained, reveal the dependence of local scour on the overall bed material gradation, and shape of the obstruction, especially the upstream interface. The models developed on basis of the experimental findings for different shapes are more realistic than the widely adopted criteria which mainly consider only effective size, d50 of the bed material, ignoring the other gradation parameters. Moreover, it was found that the obstruction shape also affects the scour phenomenon considerably.

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Acknowledgements

The paper presents part of the research work carried out by the author*, who receives a Doctoral Fellowship from the Ministry of Human Resources Development (MHRD), Government of India. The experimental work was carried out in the Fluid Mechanics Laboratory, National Institute of Technology, Srinagar, Jammu and Kashmir.

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Authors and Affiliations

  1. Department of Civil Engineering, National Institute of Technology, Srinagar, Jammu and Kashmir, India

    Bintul Huda Mir, Mohd Akbar Lone, Javeed Ahmad Bhat & Nasir Ahmad Rather

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  1. Bintul Huda Mir
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  2. Mohd Akbar Lone
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  3. Javeed Ahmad Bhat
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  4. Nasir Ahmad Rather
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Correspondence to Bintul Huda Mir.

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Mir, B.H., Lone, M.A., Bhat, J.A. et al. Effect of Gradation of Bed Material on Local Scour Depth. Geotech Geol Eng 36, 2505–2516 (2018). https://doi.org/10.1007/s10706-018-0479-x

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  • DOI: https://doi.org/10.1007/s10706-018-0479-x

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