Stability of submarine slopes in the northern South China Sea: a numerical approach
文献类型：CNKI期刊论文
| 作者 | Zhang L(张亮); Luan XW(栾锡武) |
| 发表日期 | 2013-01-15 |
| 出处 | Chinese Journal of Oceanology and Limnology
 |
| 关键词 | submarine landslide factor of safety earthquake South China Sea |
| 英文摘要 | Submarine landslides occur frequently on most continental margins. They are effective mechanisms of sediment transfer but also a geological hazard to seafloor installations. In this paper, submarine slope stability is evaluated using a 2D limit equilibrium method. Considerations of slope, sediment, and triggering force on the factor of safety (FOS) were calculated in drained and undrained (Φ=0) cases. Results show that submarine slopes are stable when the slope is <16° under static conditions and without a weak interlayer. With a weak interlayer, slopes are stable at <18° in the drained case and at <9° in the undrained case. Earthquake loading can drastically reduce the shear strength of sediment with increased pore water pressure. The slope became unstable at >13° with earthquake peak ground acceleration (PGA) of 0.5 g; whereas with a weak layer, a PGA of 0.2 g could trigger instability at slopes >10°, and >3° for PGA of 0.5 g. The northern slope of the South China Sea is geomorphologically stable under static conditions. However, because of the possibility of high PGA at the eastern margin of the South China Sea, submarine slides are likely on the Taiwan Bank slope and eastern part of the Dongsha slope. Therefore, submarine slides recognized in seismic profiles on the Taiwan Bank slope would be triggered by an earthquake, the most important factor for triggering submarine slides on the northern slope of the South China Sea. Considering the distribution of PGA, we consider the northern slope of the South China Sea to be stable, excluding the Taiwan Bank slope, which is tectonically active. |
| 文献子类 | CNKI期刊论文 |
| 资助机构 | Supported by the National Basic Research Program of China (973 Program) (No. 2007CB411702) |
| 卷 | v.31期:01页:148-160 |
| 语种 | 英文; |
| 分类号 | P736 |
| ISSN号 | 0254-4059 |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/191022]  |
| 专题 | 中国科学院海洋研究所 |
| 作者单位 | 1.KeyLaboratoryofMarineGeologyandEnvironment,InstituteofOceanology,ChineseAcademyofSciences 2.GraduateUniversityofChineseAcademyofSciences 3.KeyLaboratoryofMarineHydrocarbonResourcesandEnvironmentalGeology,MinistryofLandandResources 4.QingdaoInstituteofMarineGeology |
| 推荐引用方式 GB/T 7714 | Zhang L,Luan XW. Stability of submarine slopes in the northern South China Sea: a numerical approach. 2013. |
入库方式： OAI收割
来源：海洋研究所
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