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23 September 2019 Horizontal Planar Scale Test of Local Scour at Submerged Monopile
Liquan Xie, Zelong Liang, Meng Wang, Huang Li, Yanhong Li, Tsung-Chow Su
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Xie, L.; Liang, Z.; Wang, M.; Li, H.; Li, Y., and Su, T., 2019. Horizontal planar scale test of local scour at submerged monopile. In: Guido-Aldana, P.A. and Mulahasan, S. (eds.), Advances in Water Resources and Exploration. Journal of Coastal Research, Special Issue No. 93, pp. 298–303. Coconut Creek (Florida), ISSN 0749-0208.

Determination of the horizontal planar scale of local scour (HSLS) at a submerged monopile in water flow conditions is necessary for site selection and the intuitive effectiveness-evaluation of upstream protection projects. A simplified experimental method for the prediction of HSLS is proposed and validated with a set of indoor experiments. High efficiency was obtained by modelling the erodible bed in a thin layer at the millimeter scale, which is much smaller than the centimeter or meter scale for the prediction of scour depth. The experiment was conducted under steady, uni-directional flow in non-cohesive sand-bed conditions. A 15 cm diameter cylindrical monopile submerged 0.2 cm was rigidly fixed on a flume bed. The complete 5-minute process the HSLS undergoes to reach its equilibrium shape and size was observed. A comparison of the HSLS with other research show good agreement. Compared with the conventional method for the observation of the complete scour-hole process, which includes reaching maximum scour depth which may take days, the proposed method significantly improves the model-test efficiency. The fundamental mechanism of this high-efficiency in the HSLS' development process to reach its equilibrium state is that the HSLS is mainly influenced by the wake vortices, which are dependent on the cylinder-diameter Reynolds number instead of scour depth.

©Coastal Education and Research Foundation, Inc. 2019
Liquan Xie, Zelong Liang, Meng Wang, Huang Li, Yanhong Li, and Tsung-Chow Su "Horizontal Planar Scale Test of Local Scour at Submerged Monopile," Journal of Coastal Research 93(sp1), 298-303, (23 September 2019).
Received: 10 August 2018; Accepted: 10 March 2019; Published: 23 September 2019
horizontal planar scale of local scour
Simplified experimental method
submerged monopile
water flow
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