Influence of the internal solitary waves on the deep sea mining system. (15th December 2022)

• Record Type: Journal Article
• Authors: Sun, Hongwei; Feng, Aichun; You, Yunxiang; Chen, Ke
• Is Part Of: Ocean engineering. Volume 266(2022)Part 4
• Publication Date: 2022-12-15
• Subjects: Internal solitary waves -- Vector form intrinsic finite element -- Deep sea mining system; Ocean engineering -- Periodicals; Ocean engineering; Periodicals; 620.4162
• DOI: 10.1016/j.oceaneng.2022.113047
• Languages: English
• ISSNs: 0029-8018

Abstract

Abstract: The South China Sea is rich in mineral resources, and the prospect of developing seabed mineral resources in the South China Sea is bright. However, the South China Sea is also famous for the active internal solitary waves, the researchers detected an internal solitary waves with an amplitude of 240 m and a peak velocity of 2.55 m/s in this area, which may severely impact the deep sea mining system. In this paper, we first simplify the vector finite element method's calculation process. Then the improved vector form intrinsic finite element method is used to simulate the installation process and normal working state of the deep sea mining systems under the action of internal solitary waves. The influence of the internal solitary waves on the deep sea mining systems in the installed state is limited, and its displacement and internal force changes are controllable. Still, the internal solitary waves may cause extensive movement or 180° bends in deep sea mining systems during installation. Necessary measures must be taken during installing deep sea mining systems to reduce the effects of internal solitary waves. Highlights: In this paper, the vector form intrinsic finite element method is improved, and the calculation process is simplified. The internal solitary waves will cause large-scale movements of the deep sea mining system under normal operating conditions, but the impact is limited. The internal solitary waves will cause 180° bending and a sudden increase in top tension to the deep sea mining system in the installed state, which may cause the failure of installation. It is necessary to consider the effects of the internal solitary waves during the installation of the deep sea mining system.