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Scour around spur dike in curved channel: a review

Tripathi Ravi Prakash, Pandey Kamlesh Kumar

Acta Geophysica

2022

Vol. 70, no 5

2469--2485

A spur dike is a hydraulic structure, protruding in a river or channel used for several purposes like protection of river-bank erosion and deepening of the main channel. The present paper discusses pre-existing research work on flow pattern and prediction of temporal and maximum scours depth around the spur dikes placed in different locations at 90◦ and 180° curved channels. The equations having approximately 2.367, 4.47, 0.17, and 0.271 (average) times with their corresponding experimental data. The parameters, influencing the scour process and flow pattern, have been identified as the ratio of flow intensity to critical velocity (V/Vc≥1) is below 1 and special kind of bedding material is approximately 10 % greater than under livebed condition and many more. The numerical value of the Froude number and the geometry of the bed surface material are also discussed in this paper. Based on these parameters, the empirical formulations and experimental studies on local scours around the straight, L-shaped, T-shaped spurs, placed at 30°, 45°, 60°, 120°, and 180° azimuthal angles have been discussed. Various numerical schemes proposed in almost seventy-five literatures have been summarized. A critical review of numerical and experimental results found in different works related to temporal and maximum scour depth, flow characteristics, and bed topography around the dike shows that the data and accompanying results are insufficient for the design of spurs used as river structures in curved channels. There are needs to carry out extensive experiments, under various flow conditions, to examine the flow behavior and scouring processes around the spurs. Due to complex flow pattern and scouring processes, taking place around the spur, it becomes difficult to understand the real physics behind these phenomenon and therefore, data-driven models are suggested to arrive at more reasonable relationships required to be used for design purposes.

Numerical simulations of a turbulent flow through the curved duct obtained with the rans method

Kuczkowski M.

Zeszyty Naukowe. Cieplne Maszyny Przepływowe - Turbomachinery / Politechnika Łódzka

2008

nr 133

187--192

An incompressible, isothermal turbulent water flow in a square cross-section curved duct was investigated numerically. The duct had a 90-degree bend. The numerical simulations were conducted with different turbulence models (k-ε, k-ω, Shear Stress Transport and Reynolds Stress SSG). The ANSYS CFX code was used for all computations. The obtained results were compared with the measurements reported in literature.