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The large number of internal solitary waves in the South China Sea seriously threaten the safety of offshore engineering operations. In this paper, the vector form intrinsic finite element (VFIFE) method was used to analyze the dynamic characteristics of deep-sea steel lazy wave risers (SLWR) under the action of internal solitary waves. The dynamic model of a deep-sea steel lazy wave riser considering soil reaction in touchdown zone and internal solitary wave load was established. The internal solitary wave load was solved according to the mKdV equation. Fortran calculation program was compiled based on vector form intrinsic finite element beam element. The displacement extremum and variation trends of tension and bending moment of a riser under different incident angles were analyzed. The dynamic characteristics of a steel lazy wave riser and a simple steel catenary riser under internal solitary waves were compared. The results show that under the action of internal solitary waves, the steel lazy wave riser will have a greater displacement response, especially the upper section will have a greater horizontal displacement. Compared with the simple steel catenary riser, the steel lazy wave riser has a more significant tension variation amplitude and a more complex bending moment variation trend.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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