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Physical Modeling of Spatial and Temporal Development of Local Scour at the Downstream of Bed Protection for Low Froude Number

1
Department of Civil and Environmental Engineering, Incheon National University, 119 Academy-ro, Yeonsu-gu, Incheon 22012, Korea
2
Department of Civil and Environmental Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Korea
*
Author to whom correspondence should be addressed.
Water 2019, 11(5), 1041; https://doi.org/10.3390/w11051041
Received: 16 April 2019 / Revised: 15 May 2019 / Accepted: 15 May 2019 / Published: 18 May 2019
(This article belongs to the Section Hydraulics)
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Abstract

Local scour at the downstream of the river bed protection is one of the most important parameters for the design criteria and sustainable management of the hydraulic structures. Previously, various researches on its process in the equilibrium state have been suggested with experimental and numerical approaches. In this study, relatively long-term laboratory experiments of local scouring at the downstream of fixed bed in an open channel were conducted with mono-granular sediment bed and analyzed about maximum scour depth and its temporal development. In particular, we conducted experiments with relatively low Froude number (less than 0.5) and their duration of tests was exceeded over 700 hours. We modified the relationship between the dimensionless time and length scales of the maximum scour depth of the local scour hole based on the turbulent shear layer thickness. A new functional relationship between dominant factors and the maximum scour depth in the equilibrium state were suggested and compared with previously suggested formula. Also, from the results by nonlinear regression, Froude number was founded as a dominant factor on the prediction of equilibrium maximum scour depth. View Full-Text
Keywords: local scour; equilibrium state; maximum scour depth; laboratory experiment; non-linear regression analysis; Froude number local scour; equilibrium state; maximum scour depth; laboratory experiment; non-linear regression analysis; Froude number
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Park, S.W.; Hwang, J.H.; Ahn, J. Physical Modeling of Spatial and Temporal Development of Local Scour at the Downstream of Bed Protection for Low Froude Number. Water 2019, 11, 1041.

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