Glacial Ice and Offshore Structure Impacts under Wave and Current Excitation
Bergy bits and growlers (i.e., glacial ice features with a waterline diameter < 15 m) travelling with waves can pose great threats to offshore structure and ships operating in the high North. It is generally more difficult to detect and monitor these small ice features and apply concurrent ice ma...
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ftntnutrondheimi:oai:ntnuopen.ntnu.no:11250/2627381 2023-05-15T14:22:37+02:00 Glacial Ice and Offshore Structure Impacts under Wave and Current Excitation Lu, Wenjun Amdahl, Jørgen 2019 http://hdl.handle.net/11250/2627381 eng eng Port and Ocean Engineering under Arctic Conditions, POAC Norges forskningsråd: 203471 urn:issn:0376-6756 http://hdl.handle.net/11250/2627381 cristin:1708313 Proceedings - International Conference on Port and Ocean Engineering under Arctic Conditions Journal article Peer reviewed 2019 ftntnutrondheimi 2019-11-27T14:09:20Z Bergy bits and growlers (i.e., glacial ice features with a waterline diameter < 15 m) travelling with waves can pose great threats to offshore structure and ships operating in the high North. It is generally more difficult to detect and monitor these small ice features and apply concurrent ice management operations. Therefore, it is important to study the consequence and conduct corresponding damage assessment of potential impacts with such glacial ice features. Before conducting damage assessment, it is critical to know the potential impact location, probability of impact and the associated impact velocities for given environmental conditions (i.e., wave and current). This paper offers a method to conduct time domain coupled motion simulations of the ice feature and the offshore structure given their respective frequency domain properties (i.e., Response Amplitude Spectrums, RAOs). When their coupled motions are simulated in the time domain, we can explicitly sample the outcome of potential impact between these two bodies. For each impact scenario, the correlated impact velocity and the vertical location of impact are available. The sampled impact information enables us to quantify the ice feature’s impact probability and impact velocity at different locations of the offshore structure, thereby offering us more accurate damage assessment. This method is proved to be rather efficient and can be used in post-processing of hydrodynamic analysis when dealing with collision studies of multiple bodies. The method also shows that the current velocity plays an important role, as lower current velocity tends to increase the impact probabilities at higher locations of the structure. publishedVersion © 2019 Port and Ocean Engineering under Arctic Conditions. Will be available at http://www.poac.com/PapersOnline.html Article in Journal/Newspaper Arctic Arctic NTNU Open Archive (Norwegian University of Science and Technology) Arctic |
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Open Polar |
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NTNU Open Archive (Norwegian University of Science and Technology) |
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ftntnutrondheimi |
language |
English |
description |
Bergy bits and growlers (i.e., glacial ice features with a waterline diameter < 15 m) travelling with waves can pose great threats to offshore structure and ships operating in the high North. It is generally more difficult to detect and monitor these small ice features and apply concurrent ice management operations. Therefore, it is important to study the consequence and conduct corresponding damage assessment of potential impacts with such glacial ice features. Before conducting damage assessment, it is critical to know the potential impact location, probability of impact and the associated impact velocities for given environmental conditions (i.e., wave and current). This paper offers a method to conduct time domain coupled motion simulations of the ice feature and the offshore structure given their respective frequency domain properties (i.e., Response Amplitude Spectrums, RAOs). When their coupled motions are simulated in the time domain, we can explicitly sample the outcome of potential impact between these two bodies. For each impact scenario, the correlated impact velocity and the vertical location of impact are available. The sampled impact information enables us to quantify the ice feature’s impact probability and impact velocity at different locations of the offshore structure, thereby offering us more accurate damage assessment. This method is proved to be rather efficient and can be used in post-processing of hydrodynamic analysis when dealing with collision studies of multiple bodies. The method also shows that the current velocity plays an important role, as lower current velocity tends to increase the impact probabilities at higher locations of the structure. publishedVersion © 2019 Port and Ocean Engineering under Arctic Conditions. Will be available at http://www.poac.com/PapersOnline.html |
format |
Article in Journal/Newspaper |
author |
Lu, Wenjun Amdahl, Jørgen |
spellingShingle |
Lu, Wenjun Amdahl, Jørgen Glacial Ice and Offshore Structure Impacts under Wave and Current Excitation |
author_facet |
Lu, Wenjun Amdahl, Jørgen |
author_sort |
Lu, Wenjun |
title |
Glacial Ice and Offshore Structure Impacts under Wave and Current Excitation |
title_short |
Glacial Ice and Offshore Structure Impacts under Wave and Current Excitation |
title_full |
Glacial Ice and Offshore Structure Impacts under Wave and Current Excitation |
title_fullStr |
Glacial Ice and Offshore Structure Impacts under Wave and Current Excitation |
title_full_unstemmed |
Glacial Ice and Offshore Structure Impacts under Wave and Current Excitation |
title_sort |
glacial ice and offshore structure impacts under wave and current excitation |
publisher |
Port and Ocean Engineering under Arctic Conditions, POAC |
publishDate |
2019 |
url |
http://hdl.handle.net/11250/2627381 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Arctic |
genre_facet |
Arctic Arctic |
op_source |
Proceedings - International Conference on Port and Ocean Engineering under Arctic Conditions |
op_relation |
Norges forskningsråd: 203471 urn:issn:0376-6756 http://hdl.handle.net/11250/2627381 cristin:1708313 |
_version_ |
1766295164235546624 |