In April 2021,the Indonesian Navy submarine"KRI Nanggala-402"sank approximately 60 nautical miles(111.12 km)north of Bali.Analysis suggests that the action of large-amplitude internal solitary waves may have been one of the causes of the accident.Based on the eKdV theory of large-amplitude internal solitary waves and the Morison formula,a kinematic model of submarine motion under the action of internal solitary waves is established.It reveals the motion response characteristics of the submarine under different amplitudes of internal solitary waves and submarine depth conditions,further elucidating how internal solitary waves may have contributed to the Indonesian submarine disaster.The results indicate that internal solitary waves have a significant impact on the submarine's motion state.In the vertical direction,the submarine experiences significant depth changes in a short period,while in the horizontal direction,its motion direction aligns with the propagation direction of the solitary waves at the density interface or surface,but in the opposite direction below the interface.Moreover,the vertical moment generated by the internal solitary waves may cause the submarine to capsize.Submarines exhibit different motion response patterns under different wave amplitudes and depths.The study suggests that the Indonesian submarine accident may have occurred due to encountering significant-amplitude internal solitary waves during its mission,resulting in rapid and substantial depth changes.
NETL
NSTL
万方数据
