Investigation of the effect of a sudden flood wave on the transition of bed loading in dry ducts and the effect of submerged plates on reducing bed load

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SHAHSAVARI H.; PANAHI GH.; KHODASHENAS S.R.

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Journal: Journal of Water and Soil Conservation Year:2019 | Volume:26 | Issue:3 Page(s): 91-107

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Title

Investigation of the effect of a sudden flood wave on the transition of bed loading in dry ducts and the effect of submerged plates on reducing bed load

Author(s)

SHAHSAVARI H. | PANAHI GH. | KHODASHENAS S.R. | Issue Writer Certificate

Keywords

Bed ErosionQ2

BladeQ1

Dry FlumeQ1

Flood WaveQ1

HydrographQ1

Abstract

Background and Objectives: The prevailing rainfall in warm and dry areas is thunderstorm and causes the great floods. Destruction and sedimentation of floods cause a lot of damage. In this study, the effect of Flood Waves on the bed load transfer in a laboratory channel with unsteady flow was investigated. Materials and Methods: The width, height and length of channel were: =0. 3, 0. 4 and 10 meters respectively. Two channel longitudinal slopes were: 0% and 1. 5%. Three rivers sand with d50=0. 85, 1 and 1. 2 mm were applied. Three triangular Hydrographs with discharge peak were applied: 20, 30 and 40 lit/s/m. Results: Peak of discharge, bed slope and bed particle size play an important role in sediment transport. The results showed that with increasing slope from 0 to 0. 015, the length of hole due to erosion was 1. 92 m. The experiments showed that by decreasing the diameter of non-cohesive particles, the length of eroded hole increased to 1. 84 times. Also by doubling the peak discharge from 20 to 40 liters per second, the length of eroded hole was 2. 2 times and the maximum scour depth increased to 56 percent. To reduce the transfer of bed loading to the bottom of the Blades, they were zigzag, diagonal and perpendicular. The results showed that using the Blade, the sediment transport to the downstream decreases. In this case the perpendicular vortex of the substrate had the best performance and reduced the length and depth of the eroded hole by the inputs. Finally, the amount of sediment transfer volume decreased by 89% relative to the non-blown state. Conclusion: The results showed that the increase of discharge peak in sediment transfer was effective and also the bed sloping and reduction of the particle diameter average size caused a greater increase in bed loading. Based on the experiments, the most critical mode was selected and the Blade effect on the erosion of the bed was investigated. The results of the surveys showed that the greatest reduction in erosion was due to the vertical placement of the Blades, the crowns of the Blades being flattened.

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APA: Copy

SHAHSAVARI, H., PANAHI, GH., & KHODASHENAS, S.R.. (2019). Investigation of the effect of a sudden flood wave on the transition of bed loading in dry ducts and the effect of submerged plates on reducing bed load. JOURNAL OF WATER AND SOIL CONSERVATION (JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES), 26(3 ), 91-107. SID. https://sid.ir/paper/156516/en

Vancouver: Copy

SHAHSAVARI H., PANAHI GH., KHODASHENAS S.R.. Investigation of the effect of a sudden flood wave on the transition of bed loading in dry ducts and the effect of submerged plates on reducing bed load. JOURNAL OF WATER AND SOIL CONSERVATION (JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES)[Internet]. 2019;26(3 ):91-107. Available from: https://sid.ir/paper/156516/en

IEEE: Copy

H. SHAHSAVARI, GH. PANAHI, and S.R. KHODASHENAS, “Investigation of the effect of a sudden flood wave on the transition of bed loading in dry ducts and the effect of submerged plates on reducing bed load,” JOURNAL OF WATER AND SOIL CONSERVATION (JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES), vol. 26, no. 3 , pp. 91–107, 2019, [Online]. Available: https://sid.ir/paper/156516/en

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