Author(s): A. Jaiswal; Z. Ahmad; S. K. Mishra

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Keywords: Hydro-suction; Suction pipe diameter; Suction inlet-depth; Scour profile; Scour volume

Abstract: Sedimentation in rivers and reservoirs leads to inundation of surrounding areas, topsoil degradation, low depth for navigation, loss of reservoir capacity, etc. Hydro-suction is a process of sediment removal in which sediment is sucked along with water using a suction pipe placed vertically on/above/below the sediment bed. This paper deals with the effect of diameter and inlet-depth of suction pipe on performance of hydro-suction. A series of experiments are performed using five suction pipes of diameter of 5.08×10-2 m, 7.62×10-2 m, 10.16×10-2 m, 12.70×10-2 m, and 15.24×10-2 m, placed at inlet depth of 0.015 m and 0.03 m, under discharge ranging from 0.5×10-3 m3/s to 3×10-3 m3/s and median sediment size of 0.33 mm. Hydro-suction performance is evaluated by the sediment volume removed, which is calculated from the experimental data of scour profile. The investigation inferred that for a constant diameter, hydro-suction performance decreases with an increase in suction inlet depth. An increase in hydro-suction performance is seen up to suction pipe diameter of 10.16×10-2 m, and any further increase in suction pipe diameter decreases the hydro-suction performance.

DOI: https://doi.org/10.26077/aa4f-76f0

Year: 2022