| LIU Ke,WANG Jianhua. 2014. A continental slope stability evaluation in the Zhujiang River Mouth Basin in the South China Sea. Acta Oceanologica Sinica, 33(11):155－160 |
| A continental slope stability evaluation in the Zhujiang River Mouth Basin in the South China Sea |
| 南海珠江口盆地陆坡稳定性评价 |
| Received:October 08, 2013 Revised:June 17, 2014 |
| DOI：10.1007/s13131-014-0565-8 |
| Key words:South China Sea continental slope stability geographic information system evaluation |
| 中文关键词: 南海 陆坡稳定 地理信息系统 评价 |
| 基金项目: |
| Author Name | Affiliation | E-mail | | LIU Ke | State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300072, China
Geotechnical Engineering Institute, Tianjin University, Tianjin 300072, China
College of Mining Engineering, Hebei United University, Tangshan 063009, China | liuke1976@163.com | | WANG Jianhua | State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300072, China
Geotechnical Engineering Institute, Tianjin University, Tianjin 300072, China | |
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| Abstract: |
| In nature, a slope stability is determined by the ratio of a sliding resistance to a slide force. The slide force of a marine deep-water continental slope is mainly affected by sediment mechanics properties, a topography, and a marine seismic. However, the sliding resistance is mainly affected by sedimentary patterns and a sedimentary stress history. Both of these are different from case to case, and their impact can be addressed when the data are organized in a geographic information system (GIS). The study area on the continental slope in Zhujiang River Mouth Basin in South China Sea provides an excellent opportunity to apply GIS spatial analysis technology for the evaluation of the slope stability. In this area, a continental slope topography and a three-dimension (3-D) topography mapping show a sea-floor morphology and the distribution of a slope steepness in good detail, and the sediment analysis of seabed samples and an indoor appraisal reveals the variability of a sediment density near the sea-floor surface. On the basis of the results of nine geotechnical studies of submarine study areas, it has worked out that an equivalent cyclic shear stress ratio is roughly between 0.158 and 0.933, which is mainly depending on the initial water content of sediment. A regional density, slope and level of anticipated seismic shaking information are combined in a GIS framework to yield a map that illustrates a continental slope stability zoning under the influencing factors in Zhujiang River Mouth Basin in the South China Sea. The continental slope stability evaluation can contribute to north resources development in the South China Sea, the marine functional zoning, the marine engineering construction and adjust measures to local conditions, at the same time also can provide references for other deep-water slope stability analysis. |
| 中文摘要: |
| 自然界坡体的稳定性取决于坡体下滑力与抗滑力之间的比值关系。海洋深水陆坡的下滑力主要受松散沉积物的力学性质, 地形和地震作用影响。然而, 陆坡的抗滑力主要受沉积物的沉积模式和沉积应力历史影响。下滑力和抗滑力二者的数值随环境变化而不同, 对陆坡稳定性影响的下滑力和抗滑力可作为特定的信息组织到地理信息系统(GIS)中。南海珠江口盆地陆坡稳定性评价具有很好的利用地理信息系统空间分析功能的优势, 研究区的海底陆坡地形地貌及三维地貌图直观反映了这个区域的海底形态和详细的陆坡坡度分布情况, 另外, 海底沉积物的分析和室内试验测定了海底不同表层沉积物的密度。本文基于海底研究区9个岩土测点的沉积物分析, 提出了该区沉积物的等效循环应力比大致在0.158~0.933之间, 并且该值的大小主要依赖于海洋沉积物初始含水率。本文将海洋陆坡沉积物密度值, 坡度值和影响该区的地震活动等信息汇总于地理信息系统中, 通过该系统的分析功能形成了直观反映各个影响因素共同作用下的南海珠江口盆地陆坡稳定性分区评价图。该陆坡稳定性评价有助于南海北部资源开发, 海洋功能区划, 因地制宜调整海洋工程布局, 同时也可为其他海域深水陆坡分析提供参考。 |
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