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Superelevation and Bed Variation Due to Attack Angle of Submerged Vanes in Curved Channel

수제 입사각에 따른 개수로 만곡부의 편수위와 하상변동

Park, Sang Deog;Paik, Joongcheol;Jeon, Woo Sung;Lee, Hyun Jae
박상덕;백중철;전우성;이현재

  • Received : 2018.11.26
  • Accepted : 2019.02.07
  • Published : 2019.04.01

Abstract

Since the centrifugal force acts on the flow in the curved channel, a transverse water surface gradient occurs and the thalweg is biased toward the outer bank. The submerged vanes may be used to solve various engineering problems of the curved channels. In order to analyze the influence of an attack angle and the distance between the vane arrays on the river bed variation and the superelevation in a bend, movable bed hydraulic experiments were conducted in a $90^{\circ}$ curved rectangular channel of a small-size gravel bed. Installing the submerged vanes in the bend increases the maximum scour depth. But if vanes are installed in a uniform obtuse angle, the scour depth may be reduced. If the flow rate in the channel bend with vanes equals to the channel forming discharge, the location of the maximum scour depth moved to the downstream and the superelevation increased. However if the flow rate is smaller than that, the location of the maximum scour depth moved upstream and the superelevation decreased. The channel bed change and the superelevation due to the installation of the submerged vanes have been dependent on the interaction of the attack angle, the flow rate, and the distance between the arrays.

Keywords

Submerged vane;Channel bend;Scour;Maximum scour depth;Superelevation

Acknowledgement

Supported by : 국토교통부, 한국연구재단