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Experimental investigation of the effect of permeability and angle of gabion submerged vane on bed topography

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Abstract

Submerged vanes are used as an eco-friendly low-cost measure for the management of river bed sediment. The performance of the vane is more sensitive to its angle of installation. A high angle increases the vane’s nose scour which results in its failure, and a lower angle reduces the vane’s performance. The design angles for the impenetrable vane are known, whilst for the impermeable vane are not clear. Therefore, it is our goal to experimentally examine the performance of permeable submerged gabion vane (SGV) with different permeability and different installed angles (α) in two conditions of clear water (CW) and live bed (LB). Experiments were performed in an 11-m-long and 0.66-m-wide bed flume. A SGV with a size 0.16-m wide, 0.80-m high, and 0.20-m thick was installed in the center of the flume with the submergence ratio (T/do = 0.5). The flow depth was 0.16 m, and the flume bed was covered with uniform sand bed (d50 = 0.48 mm). The SGV was filled with four different sizes of very fine, fine, medium, and coarse gravels and installed at different angles: \(\alpha\)=10°, 15°, 20°, 25°, 30°, and 35°. Comparing the maximum scour depth around the SGV at the end of each experiment, it shows that the vane’s nose scour is minimum at α = 20°, whilst for the LW condition, the minimum scour depth occurs at α = 25°. Moreover, under all hydraulic conditions, the results reveal that the permeability of the gabion can reduce the vane’s scour depth and the minimum scour depth was for gabion filled with gravel (D50 = 4 mm).

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Acknowledgements

We are grateful to the Research Council of the Shahid Chamran University of Ahvaz for financial support (GN: SCU.WH1400.470).

Funding

The work has funded by Shahid Chmaran University of Ahvaz. Grant No.SCU.WH1400.470.

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Correspondence to Mahmood Shafai Bejestan.

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The authors declare no competing interests.

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Responsible Editor: Amjad Kallel

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Sarlak, H., Bejestan, M.S. & Sajjadi, S.M. Experimental investigation of the effect of permeability and angle of gabion submerged vane on bed topography. Arab J Geosci 16, 288 (2023). https://doi.org/10.1007/s12517-023-11332-1

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  • DOI: https://doi.org/10.1007/s12517-023-11332-1

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