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A platform for research: civil engineering, architecture and urbanism
Scour protections of collar around a monopile foundation in steady current
https://orcid.org/0000-0003-1445-4399
Highlights For the collar base, the increase in thickness would effectively prevent the local scour beneath the base and lead to a decrease in the critical value of Dp/D. The influence of the diameter Dp/D can be ascribed to the fact that the collar base can take over the seabed region that the horseshoe vortex governs and further reduce the sediment transport at the junction. As for the collar column, the existence of the initial buried depth xb/D would provide space for the local scour to develop. At a small value of initial buried depth, the diameter of the collar plays a key role in the development of the local scour. With the increase in xb/D, the effectiveness of the scour reduction increases dramatically. It is shown that the effectiveness of the collar base and collar column is independent of the flow intensity in live-bed conditions.
Abstract An experimental study on scour protection around a monopile foundation in steady current was carried out with the adoption of collar base and collar column. Through the analysis of scouring features, the effectiveness of the collar base and collar column on the local scour was quantified. The parameters of flow conditions (θs/θcr), diameter (Dp/D), and thickness (hs/D), together with the initial buried depth (xb/D) for the collar base and collar column were investigated. For the collar base, the increase in thickness would effectively prevent the local scour beneath the base and lead to a decrease in the critical value of Dp/D. The influence of the diameter Dp/D can be ascribed to the fact that the collar base can take over the seabed region that the horseshoe vortex governs and further reduce the sediment transport at the junction. As for the collar column, the existence of the initial buried depth xb/D would provide space for the local scour to develop. At a large value of initial buried depth, the diameter Dp/D is no longer the main physical parameter. The effectiveness of the collar base and collar column is independent of the flow intensity in live-bed conditions.
Scour protections of collar around a monopile foundation in steady current
https://orcid.org/0000-0003-1445-4399
Highlights For the collar base, the increase in thickness would effectively prevent the local scour beneath the base and lead to a decrease in the critical value of Dp/D. The influence of the diameter Dp/D can be ascribed to the fact that the collar base can take over the seabed region that the horseshoe vortex governs and further reduce the sediment transport at the junction. As for the collar column, the existence of the initial buried depth xb/D would provide space for the local scour to develop. At a small value of initial buried depth, the diameter of the collar plays a key role in the development of the local scour. With the increase in xb/D, the effectiveness of the scour reduction increases dramatically. It is shown that the effectiveness of the collar base and collar column is independent of the flow intensity in live-bed conditions.
Abstract An experimental study on scour protection around a monopile foundation in steady current was carried out with the adoption of collar base and collar column. Through the analysis of scouring features, the effectiveness of the collar base and collar column on the local scour was quantified. The parameters of flow conditions (θs/θcr), diameter (Dp/D), and thickness (hs/D), together with the initial buried depth (xb/D) for the collar base and collar column were investigated. For the collar base, the increase in thickness would effectively prevent the local scour beneath the base and lead to a decrease in the critical value of Dp/D. The influence of the diameter Dp/D can be ascribed to the fact that the collar base can take over the seabed region that the horseshoe vortex governs and further reduce the sediment transport at the junction. As for the collar column, the existence of the initial buried depth xb/D would provide space for the local scour to develop. At a large value of initial buried depth, the diameter Dp/D is no longer the main physical parameter. The effectiveness of the collar base and collar column is independent of the flow intensity in live-bed conditions.
Scour protections of collar around a monopile foundation in steady current
https://orcid.org/0000-0003-1445-4399
Highlights For the collar base, the increase in thickness would effectively prevent the local scour beneath the base and lead to a decrease in the critical value of Dp/D. The influence of the diameter Dp/D can be ascribed to the fact that the collar base can take over the seabed region that the horseshoe vortex governs and further reduce the sediment transport at the junction. As for the collar column, the existence of the initial buried depth xb/D would provide space for the local scour to develop. At a small value of initial buried depth, the diameter of the collar plays a key role in the development of the local scour. With the increase in xb/D, the effectiveness of the scour reduction increases dramatically. It is shown that the effectiveness of the collar base and collar column is independent of the flow intensity in live-bed conditions.
Abstract An experimental study on scour protection around a monopile foundation in steady current was carried out with the adoption of collar base and collar column. Through the analysis of scouring features, the effectiveness of the collar base and collar column on the local scour was quantified. The parameters of flow conditions (θs/θcr), diameter (Dp/D), and thickness (hs/D), together with the initial buried depth (xb/D) for the collar base and collar column were investigated. For the collar base, the increase in thickness would effectively prevent the local scour beneath the base and lead to a decrease in the critical value of Dp/D. The influence of the diameter Dp/D can be ascribed to the fact that the collar base can take over the seabed region that the horseshoe vortex governs and further reduce the sediment transport at the junction. As for the collar column, the existence of the initial buried depth xb/D would provide space for the local scour to develop. At a large value of initial buried depth, the diameter Dp/D is no longer the main physical parameter. The effectiveness of the collar base and collar column is independent of the flow intensity in live-bed conditions.
Scour protections of collar around a monopile foundation in steady current
Zhang, Qin (author) / Tang, Guoqiang (author) / Lu, Lin (author) / Yang, Fan (author)
Applied Ocean Research ; 112
2021-05-12
Article (Journal)
Electronic Resource
English
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