Risk assessment of sea ice disasters on fixed jacket platforms in Liaodong Bay
Sea ice disasters seriously threaten the structural safety of oil platforms in the Bohai Sea. Therefore, it is necessary to carry out a risk assessment of sea ice disasters on oil platforms in the Bohai Sea. In this study, a risk assessment of sea ice disasters on fixed jacket platforms in Liaodong...
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ftcopernicus:oai:publications.copernicus.org:nhess72007 2023-05-15T18:16:12+02:00 Risk assessment of sea ice disasters on fixed jacket platforms in Liaodong Bay Xu, Ning Yuan, Shuai Liu, Xueqin Ma, Yuxian Shi, Wenqi Zhang, Dayong 2020-04-24 application/pdf https://doi.org/10.5194/nhess-20-1107-2020 https://nhess.copernicus.org/articles/20/1107/2020/ eng eng doi:10.5194/nhess-20-1107-2020 https://nhess.copernicus.org/articles/20/1107/2020/ eISSN: 1684-9981 Text 2020 ftcopernicus https://doi.org/10.5194/nhess-20-1107-2020 2020-07-20T16:22:14Z Sea ice disasters seriously threaten the structural safety of oil platforms in the Bohai Sea. Therefore, it is necessary to carry out a risk assessment of sea ice disasters on oil platforms in the Bohai Sea. In this study, a risk assessment of sea ice disasters on fixed jacket platforms in Liaodong Bay, in the Bohai Sea, was performed in five steps. Firstly, the formation mechanisms of sea ice disasters were analyzed and the sources and modes of sea ice risks were summarized. Secondly, according to the calculation formulas of extreme ice force, dynamic ice force, and accumulated force, several ice indices such as thickness, motion, strength, period, and concentration were proposed as the hazard indices, and corresponding values were then assigned to the proposed indices based on ice conditions in the Bohai Sea. Thirdly, based on four structural failure modes – structural overturning by extreme ice force (Mode 1), structural fracture failure caused by dynamic ice force (Mode 2), the damage of facilities caused by dynamic ice force (Mode 3), and structural function failure caused by accumulated ice (Mode 4) – the structural vulnerability index, overturning index, dynamic index, ice-induced vibration index, and function index were proposed, and corresponding values were assigned to the structural vulnerability index of fixed jacket platforms in Liaodong Bay. Fourthly, the weight of each risk index was determined according to previously recorded sea ice disasters and accidents, and the sea ice risk was then calculated with the weighted synthetic index method. Finally, with the above index system and risk assessment methods, the risk assessment of sea ice disasters on 10 jacket platforms in three sea areas in Liaodong Bay was carried out. The analysis results showed that efficient sea ice prevention strategies could largely mitigate the sea ice-induced vibration-related risks of jacket platforms in Liaodong Bay. If steady-state vibration occurs (usually in front of the vertical legged structure) or the structural fundamental frequency is high, the structural vulnerability is significantly increased and the calculated risk levels are high. The sea ice risk assessment method can be applied in the design, operation, and management of other engineering structures in sea ice areas. Text Sea ice Copernicus Publications: E-Journals Natural Hazards and Earth System Sciences 20 4 1107 1121 |
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Copernicus Publications: E-Journals |
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ftcopernicus |
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English |
description |
Sea ice disasters seriously threaten the structural safety of oil platforms in the Bohai Sea. Therefore, it is necessary to carry out a risk assessment of sea ice disasters on oil platforms in the Bohai Sea. In this study, a risk assessment of sea ice disasters on fixed jacket platforms in Liaodong Bay, in the Bohai Sea, was performed in five steps. Firstly, the formation mechanisms of sea ice disasters were analyzed and the sources and modes of sea ice risks were summarized. Secondly, according to the calculation formulas of extreme ice force, dynamic ice force, and accumulated force, several ice indices such as thickness, motion, strength, period, and concentration were proposed as the hazard indices, and corresponding values were then assigned to the proposed indices based on ice conditions in the Bohai Sea. Thirdly, based on four structural failure modes – structural overturning by extreme ice force (Mode 1), structural fracture failure caused by dynamic ice force (Mode 2), the damage of facilities caused by dynamic ice force (Mode 3), and structural function failure caused by accumulated ice (Mode 4) – the structural vulnerability index, overturning index, dynamic index, ice-induced vibration index, and function index were proposed, and corresponding values were assigned to the structural vulnerability index of fixed jacket platforms in Liaodong Bay. Fourthly, the weight of each risk index was determined according to previously recorded sea ice disasters and accidents, and the sea ice risk was then calculated with the weighted synthetic index method. Finally, with the above index system and risk assessment methods, the risk assessment of sea ice disasters on 10 jacket platforms in three sea areas in Liaodong Bay was carried out. The analysis results showed that efficient sea ice prevention strategies could largely mitigate the sea ice-induced vibration-related risks of jacket platforms in Liaodong Bay. If steady-state vibration occurs (usually in front of the vertical legged structure) or the structural fundamental frequency is high, the structural vulnerability is significantly increased and the calculated risk levels are high. The sea ice risk assessment method can be applied in the design, operation, and management of other engineering structures in sea ice areas. |
format |
Text |
author |
Xu, Ning Yuan, Shuai Liu, Xueqin Ma, Yuxian Shi, Wenqi Zhang, Dayong |
spellingShingle |
Xu, Ning Yuan, Shuai Liu, Xueqin Ma, Yuxian Shi, Wenqi Zhang, Dayong Risk assessment of sea ice disasters on fixed jacket platforms in Liaodong Bay |
author_facet |
Xu, Ning Yuan, Shuai Liu, Xueqin Ma, Yuxian Shi, Wenqi Zhang, Dayong |
author_sort |
Xu, Ning |
title |
Risk assessment of sea ice disasters on fixed jacket platforms in Liaodong Bay |
title_short |
Risk assessment of sea ice disasters on fixed jacket platforms in Liaodong Bay |
title_full |
Risk assessment of sea ice disasters on fixed jacket platforms in Liaodong Bay |
title_fullStr |
Risk assessment of sea ice disasters on fixed jacket platforms in Liaodong Bay |
title_full_unstemmed |
Risk assessment of sea ice disasters on fixed jacket platforms in Liaodong Bay |
title_sort |
risk assessment of sea ice disasters on fixed jacket platforms in liaodong bay |
publishDate |
2020 |
url |
https://doi.org/10.5194/nhess-20-1107-2020 https://nhess.copernicus.org/articles/20/1107/2020/ |
genre |
Sea ice |
genre_facet |
Sea ice |
op_source |
eISSN: 1684-9981 |
op_relation |
doi:10.5194/nhess-20-1107-2020 https://nhess.copernicus.org/articles/20/1107/2020/ |
op_doi |
https://doi.org/10.5194/nhess-20-1107-2020 |
container_title |
Natural Hazards and Earth System Sciences |
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20 |
container_issue |
4 |
container_start_page |
1107 |
op_container_end_page |
1121 |
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1766189655610359808 |