Experimental Study The Effect of Hydraulic Jets Distance Relative To Sediment Surface On Efficiency of Hydrosuction Quadrate Jet Method

Document Type : Research Paper

Authors

1 department of water engineering, faculty of agriculture, shahid bahonar university of kerman.

2 department of water engineering, faculty of agriculture, shahid bahonar university of kerman

Abstract

Due to the increase of sedimentation phenomena on in Iran’s dams reservoirs and clogging of river basin or pond’s opening, it is necessary to provide a method that drains the sediment with lowest cost. Hydrosuction method according to the ability to control the outflow sediments and environmental compatibility, is economical method and it seems that it is possible to improve the performance of system in sediment drainage in methods such as jet- hydro suction with proper jet arrangement and adjusting the hydraulic jet distance relative to the sediment surface which has been addressed in this study. For this purpose the effect of quadrate arrangement of jets (square arrangement) with three hydraulic jet distance relative to sediment surface (+2 cm, 0, -2cm) and three effective heads (65 cm, 70 cm, 75cm) on efficiency of hydrosuction method was investigated and recorded values were compared to the values obtained from control sample (jet less) and single jet experiments. Final results showed that maximum sediment discharge efficiency and scour hole volume has occurred in 75 cm effective head and -2 cm hydraulic jet distance to sediment distance in square arrangement. This mentioned traits in square arrangement of jets, compared to jet less sample, were 17.18 and 14.53 times higher and compared to single jet were 1.52 and 1.51 times higher respectively

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History

  • Receive Date: 15 April 2019
  • Revise Date: 24 November 2019
  • Accept Date: 24 November 2019
  • First Publish Date: 24 November 2019

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