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Investigation on the effect of inclined crest step pool on scouring protection in erodible river beds

Author

Listed:
  • Rohallah Fattahi Nafchi

    (Shahrekord University)

  • Hamid Raeisi Vanani

    (Shahrekord University)

  • Kobra Noori Pashaee

    (Shahrekord University)

  • Hosein Samadi Brojeni

    (Shahrekord University)

  • Kaveh Ostad-Ali-Askari

    (Isfahan University of Technology)

Abstract

One of the aquatic structures that are used for protect water channels against bed erosion is serial step-pool. These steps similarity of the vertical drops structure are exposed to danger of scouring downstream of such structures. The objective of this paper was to evaluate the capability of the step-pool method using a ramp at the upper edge to protect channels bed against erosion meanwhile increase required distance between two consecutive step-pool and reduce the downstream scouring depth due to waterfall on the step-pool. For this task, a laboratory flume was used. The experiments conducted on step-pools with ramps having nightmares slope angles of 0°, 20°, 30° and 40° and discharges of 10, 20, 30, 40 and 50 L per second and channel slopes of 1%, 2% and 3% for clear water. The results showed that by installing a ramp segment on the steps with a slope angle of 40° the maximum of downstream scouring depth would be decreased at 41%, 15% and 21% for flume bed slope of 1%, 2% and 3% respectively, comparing ordinary step pools (steps without ramp). These results showed that installing a ramp on the steps should cause location of maximum scouring depth point to move significantly toward downstream, and this should increase the step stability of this protective structures. Based on the results of this research may assert that using a ramp segment on the step increases the pool step efficiency for protecting mountainous river beds especially for subcritical flow regimes on slopes smaller than 2%.

Suggested Citation

  • Rohallah Fattahi Nafchi & Hamid Raeisi Vanani & Kobra Noori Pashaee & Hosein Samadi Brojeni & Kaveh Ostad-Ali-Askari, 2022. "Investigation on the effect of inclined crest step pool on scouring protection in erodible river beds," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 110(3), pages 1495-1505, February.
    • Handle: RePEc:spr:nathaz:v:110:y:2022:i:3:d:10.1007_s11069-021-04999-w
    DOI: 10.1007/s11069-021-04999-w
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    References listed on IDEAS

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    1. Kaveh Ostad-Ali-Askari & Mohammad Shayannejad, 2021. "Quantity and quality modelling of groundwater to manage water resources in Isfahan-Borkhar Aquifer," Environment, Development and Sustainability: A Multidisciplinary Approach to the Theory and Practice of Sustainable Development, Springer, vol. 23(11), pages 15943-15959, November.
    2. Mojtaba Pirnazar & Hafez Hasheminasab & Arash Zand Karimi & Kaveh Ostad-Ali-Askari & Zahra Ghasemi & Majedeh Haeri-Hamedani & Elham Mohri-Esfahani & Saeid Eslamian, 2018. "The evaluation of the usage of the fuzzy algorithms in increasing the accuracy of the extracted land use maps," International Journal of Global Environmental Issues, Inderscience Enterprises Ltd, vol. 17(4), pages 307-321.
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    2. D. A. Sabӑu & Gh. Şerban & P. Breţcan & D. Dunea & D. Petrea & I. Rus & D. Tanislav, 2023. "Combining radar quantitative precipitation estimates (QPEs) with distributed hydrological model for controlling transit of flash-flood upstream of crowded human habitats in Romania," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 116(1), pages 1209-1238, March.

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