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An experimental study of the geometric performance of the hydrosuction dredging system

  • Research Article - Hydrology
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Abstract

Sedimentation in dam reservoirs causes problems such as reducing storage volume and useful life of reservoirs, reducing the volume of flood control, sluices, tunnels, and turbines clogged, and other related issues. Despite the development of several methods to solve this problem, the sedimentation rate of the world’s dam reservoirs indicates the existence of this problem. The Hydrosuction Sediment Removal System discharges sediments inside the dam reservoir using the energy caused by the difference in water level in the reservoir and the output point of the system. This study is aimed to investigate the effect of geometric properties of the hydrosuction system (effective head, suction pipe diameter, and suction pipe inlet angle) on its performance and to understand the flow characteristics and behaviors in the hydrosuction dredging operation. Quantitative comparison of the results revealed that, with the increase in the suction pipe diameter from 478 to 956, the growth of the effective head from 21 × 103 to 34 × 103, and the increase in the suction pipe inlet angle from 30º to 90º, the maximum diameter and depth of the scour hole increased by 103% and 275%, 22% and 49%, and 38% and 50%, respectively. At the beginning of the desilting process by the hydrosuction system, seepage flow through deposits removed sediment particles and, along with the scour hole dimensions development, it reduced the effect of this flow type. Irregular vortexes were observed in the final stages of the desilting process. These vortexes caused limited development in the scour hole.

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Abbreviations

H :

Effective head caused by the difference between the water level inside the reservoir and the system output point (L);

D P :

Suction pipe diameter (L);

α :

Suction pipe inlet angle relative to the horizon;

D 50 :

Median size of the sediment particles (L);

ρ w :

Water density (ML−3);

ρ s :

Particle density (ML−3);

Gs :

Specific gravity of sediment;

μ :

Dynamic viscosity of water (ML−1 T−1),

Re:

Reynolds number in suction pipe inlet;

L :

Suction pipe length (L);

σg :

Geometric standard deviation of sediment;

g :

Acceleration due to gravity (LT−2);

E :

Hydrosuction system efficiency;

V s :

Volume of removed sediment (L3);

V w :

Volume of harvested water (L3);

D Scour hole :

Maximum diameter of scour hole (L);

Z Scour hole :

Maximum depth of scour hole (L)

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Authors and Affiliations

  1. Department of Water Engineering, Shahid Bahonar University of Kerman, Kerman, Iran

    Atefeh Moghbeli & Mohammad Zounemat-Kermani

  2. Department of Civil Engineering, Shahid Bahonar University of Kerman, Kerman, Iran

    Mohammad Javad Khanjani

Authors
  1. Atefeh Moghbeli
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  2. Mohammad Javad Khanjani
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  3. Mohammad Zounemat-Kermani
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Correspondence to Mohammad Zounemat-Kermani.

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Communicated by Michael Nones, Ph.D. (CO-EDITOR-IN-CHIEF).

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Moghbeli, A., Khanjani, M.J. & Zounemat-Kermani, M. An experimental study of the geometric performance of the hydrosuction dredging system. Acta Geophys. 69, 271–283 (2021). https://doi.org/10.1007/s11600-020-00524-y

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