Risk assessment of sea ice disasters on fixed jacket platforms in Liaodong Bay
<p>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...
Main Authors: | , , , , , |
---|---|
Format: | Article |
Language: | English |
Published: |
Copernicus Publications
2020-04-01
|
Series: | Natural Hazards and Earth System Sciences |
Online Access: | https://www.nat-hazards-earth-syst-sci.net/20/1107/2020/nhess-20-1107-2020.pdf |
id |
doaj-bcc63f8ea99c4e1b919b8b776231767b |
---|---|
record_format |
Article |
spelling |
doaj-bcc63f8ea99c4e1b919b8b776231767b2020-11-25T02:59:50ZengCopernicus PublicationsNatural Hazards and Earth System Sciences1561-86331684-99812020-04-01201107112110.5194/nhess-20-1107-2020Risk assessment of sea ice disasters on fixed jacket platforms in Liaodong BayN. Xu0S. Yuan1X. Liu2Y. Ma3W. Shi4D. Zhang5National Marine Environmental Monitoring Center, Dalian, 116023, ChinaNational Marine Environmental Monitoring Center, Dalian, 116023, ChinaNational Marine Environmental Monitoring Center, Dalian, 116023, ChinaNational Marine Environmental Monitoring Center, Dalian, 116023, ChinaNational Marine Environmental Monitoring Center, Dalian, 116023, ChinaSchool of Ocean Science and Technology, Dalian University of Technology, Panjin, 124221, China<p>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.</p>https://www.nat-hazards-earth-syst-sci.net/20/1107/2020/nhess-20-1107-2020.pdf |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
N. Xu S. Yuan X. Liu Y. Ma W. Shi D. Zhang |
spellingShingle |
N. Xu S. Yuan X. Liu Y. Ma W. Shi D. Zhang Risk assessment of sea ice disasters on fixed jacket platforms in Liaodong Bay Natural Hazards and Earth System Sciences |
author_facet |
N. Xu S. Yuan X. Liu Y. Ma W. Shi D. Zhang |
author_sort |
N. Xu |
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 |
publisher |
Copernicus Publications |
series |
Natural Hazards and Earth System Sciences |
issn |
1561-8633 1684-9981 |
publishDate |
2020-04-01 |
description |
<p>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.</p> |
url |
https://www.nat-hazards-earth-syst-sci.net/20/1107/2020/nhess-20-1107-2020.pdf |
work_keys_str_mv |
AT nxu riskassessmentofseaicedisastersonfixedjacketplatformsinliaodongbay AT syuan riskassessmentofseaicedisastersonfixedjacketplatformsinliaodongbay AT xliu riskassessmentofseaicedisastersonfixedjacketplatformsinliaodongbay AT yma riskassessmentofseaicedisastersonfixedjacketplatformsinliaodongbay AT wshi riskassessmentofseaicedisastersonfixedjacketplatformsinliaodongbay AT dzhang riskassessmentofseaicedisastersonfixedjacketplatformsinliaodongbay |
_version_ |
1724700845292912640 |