Effect of Spacing of Submerged Vanes on Bed Scour Around River Bends

Abstract

49)Performance of single array submerged vanes related to bed scour around the river bends has been dealt with in this paper. Experiments were carried out in a curved channel having two consecutive meanders with vanes arranged in a single array fashion for different spacings of vanes, i.e., stream-wise centre-to-centre spacing and vaneto-bank distances. This experimental study reveals that the strength of the secondary circulation induced due to bend flow is reduced with the placement of vanes. This results in less bed scour around the bends. A predictor for the estimation of maximum depth of flow at the outer banks for both the upstream and downstream meanders has been proposed. The estimated maximum flow depths using the proposed predictor compare well with the observed one.

Analysis of Multifactor Influence Model on Energy Dissipation Rate of Rough-Strips Energy Dissipator in the Spillway Bend

“…For physical model tests, some scholars studied macroscopic features, such as the structure, turbulence characteristics, hydraulic characteristics of bend flow by conducting different types of model tests and combining with theoretical analysis [6][7][8][9][10][11][12][13][14]; and in terms of numerical simulation, some scholars have established two-dimensional or three-dimensional bend flow mathematical models by using a variety of algorithms, such as the finite volume method, and compared with the model test to verify, supplement the model test shortcomings, and analyze the characteristics of bend flow from a microscopic point of view [5,[8][9][10][11][13][14][15][16][17][18][19][20][21][22][23][24][25][26]. Previous studies have mostly focused on hydraulic characteristics of flow in bends, and some scholars have put forward engineering auxiliary measures to improve flow conditions in bends, such as vanes [27,28], guide walls [29], spur dikes [30,31], riprap [32], etc.…”

Analysis of Effects of Rough Strip Energy Dissipator on Hydraulic Property of Bend Flow

“…Since then, most researchers have investigated the basic characteristics of bend flow, such as water depth distribution [4,[11][12][13][14], flow velocity distribution [6,[12][13][14][15][16][17][18][19][20][21][22], and secondary flow [6,13,14,16,18,20,[23][24][25][26][27][28]. With the knowledge of the characteristics of bend flow, some researchers have improved bend flow patterns by considering different engineering measures, such as guide walls [4], permeable spur dikes [7], vanes [15,29], and ripraps [30]. However, studies on engineering measures to improve bend flow patterns and their application to spillways with large width (B)-to-depth (H) ratios (B/H > 5) are still insufficient.…”