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Runout prediction and dynamic characteristic analysis of a potential submarine landslide in Liwan 3-1 gas field

Acta Oceanologica Sinica 2015年第7期34卷 116-122页

作者： XIU Zongxiang LIU Lejun XIE Qiuhong LI Jiagang HU Guanghai YANG Jianghui First Institute of Oceanography State Oceanic Administration China National Offshore Oil Corporation Research Institute Offshore Oil Engineering Co. Ltd.

A large number of submarine landslides with different scales have been identified in the canyon area of the submarine pipeline route of Liwan 3-1 gas field. There is still much chance that submarine slope failures would happen, and the following mass movement would present great risk to the submarine pipeline. In view of this, a numerical prediction method based on Eulerian-Eulerian two-phase flow model is introduced to simulate the mass movement of potential submarine landslides. The sliding soil and ambient water are respectively simulated by Herschel-Bulkley rheology model and Newtonian fluid model. The turbulence is simulated using the k-e model. Compared with both the experiment data and Bing result, the two-phase flow model shows a good accuracy, and its result is more close to the actual situation; the dynamic coupling between soil and ambient water can be effectively simulated and the phenomena of hydroplaning and head detachment can be obtained. Finally, the soil movement of a potential submarine landslide is simulated as an example, according to the seismic profile in the canyon area. The result shows that the hydroplaning occurs during the movement process. The runout distance calculated by the two-phase flow model is 877 m, which is 27.1% larger than the Bing result. However, the peak front velocity of soil is relative small, with a maximum value of 8.32 m/s. The Bing program with a simple and rapid process can be used for a preliminary evaluation, while the two-phase flow model is more appropriate for an accurate assessment.

关键词： submarine landslide Eulerian-Eulerian two-phase flow model Herschel-Bulkley model hydroplaning

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Evaluation of Height of Tsunami Induced by submarine landslide

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Journal of Energy and Power Engineering 2018年第1期12卷 35-43页

作者： Yoshikane Murakami Takemi Shikata Koji Tonomo Centers for Civil Engineering and Architectures Kansai Electric Power Co. Inc. Fukushima Ward Osaka Osaka 553-0003Japan Port and Coastal Engineering Group Newjec Inc. Kita Ward Osaka Osaka 531-0074 Japan

Under the new regulatory requirements for nuclear power plants in Japan, which were enacted in response to the nuclear accident associated with the Great East Japan Earthquake Tsunami that occurred on 11 March 2011, it is a requirement to establish a site-specific ＂standard tsunami＂ based on numerical analysis considering non-seismic factors in addition to general seismic faults. It is necessary to establish a consistent evaluation scheme for estimation of tsunami height induced by submarine landslide, since a standard framework for evaluation has not yet been established even though several models for calculation have been proposed and applied in practice. In this study, we estimated the scale of submarine landslide from a literature survey and showed examples of tsunami height evaluation using multiple schemes. As a result of evaluation of tsunami height using three schemes, the Watts model, the KLS model, and the modified-KLS model, the result obtained by the KLS model was comparatively large for every case.

关键词： submarine landslide landslide-induced tsunami tsunami height evaluation new regulatory requirements for nuclearpower plants in Japan standard tsunami.

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Tsunami hazard assessment in the South China Sea:A review of recent progress and research gaps

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Science China Earth Sciences 2022年第5期65卷 783-809页

作者： Linlin LI Qiang QIU Zhigang LI Peizhen ZHANG Guangdong Provincial Key Laboratory of Geodynamics and Geohazards School of Earth Sciences and EngineeringSun Yat-sen UniversityGuangzhou 510275China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519082China CAS Key Laboratory of Ocean and Marginal Sea Geology South China Sea Institute of OceanologyInnovation Academy of South China Sea Ecology and Environmental EngineeringChinese Academy of SciencesGuangzhou 510301China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou 511458China China-Pakistan Joint Research Center on Earth Sciences CAS-HECIslamabad 45320Pakistan

The South China Sea region is potentially threatened by tsunami hazards originated from multiple sources:the Manila subduction zone in the east,the Littoral Fault Zone(LFZ)in the north,numerous submarine landslides on the continental slopes and the volcanic islands in the Luzon *** but potentially devastating tsunami hazard poses a great threat to the populous coastal region,fishery,oil and gas exploitation in the deep sea,*** we review the recent progress in tsunami hazard assessment in the South China Sea region,focusing on two primary sources:submarine earthquakes and *** sort and review the literature by the two commonly used approaches:deterministic and probabilistic tsunami hazard assessment for both source *** simulating tsunamis generated by typical earthquakes originated from the Manila Trench,the LFZ and landslides in the continental slopes,we investigate their tsunamigenic mechanism and key tsunami characteristics in the South China Sea *** point out the research gaps and highlight the key issues to be addressed in the future.

关键词： Tsunami submarine earthquake submarine landslide the Littoral Fault Zone

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Slope Instability Analysis of the Qiongdongnan Basin in the Northern Part of the South China Sea:Implications for the Risk Evaluation of Deepwater Drilling

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Journal of Ocean University of China 2023年第2期22卷 393-409页

作者： MA Linwei WU Shiguo LIU Yanrui SUN Jin OUYANG Min LI Qingping QIN Yongpeng WANG Dawei Laboratory of Marine Geophysics and Georesources Institute of Deep-Sea Science and EngineeringChinese Academy of SciencesSanya 572000China University of Chinese Academy of Sciences Beijing 100049China College of Geophysics Chengdu University of TechnologyChengdu 610059China CNOOC China Limited Zhanjiang BranchZhanjiang 524057China State Key Laboratory of Natural Gas Hydrate CNOOC Research Institute Company LimitedBeijing 100028China

The instability of continental slopes damages marine engineering equipment,such as submarine pipelines,resulting in the generation of tsunamis,which endangers the safety of nearshore ***,research on the instability of continental slopes where submarine landslides usually occur is crucial to the risk evaluation of deepwater *** studies were mainly based on simplified 2D and 3D models,which extend the 2D model applied on submarine slopes with complex *** this study,a numerical model with bathymetric data from the Qiongdongnan Basin was ***,3D slope stability analysis and static and dynamic analyses were *** static analysis found two discussions where slopes are most likely to *** the analysis of different seismic forces,the dynamic result showed that an instability area is added to the two positions where the static analysis is *** scatters and transmits seismic waves and controls the accumulation and diffusion of seismic energy.3D calculations and analysis revealed that the direction of slope instability is closely related to terrain inclination,slope,terrain effect,and terrain *** showed that instability situations could not be derived from a single direction or profile *** situations are an important factor in slope stability analysis and are critical to the prediction and evaluation of marine geological disasters.

关键词： South China Sea submarine landslide slope instability topography curvature topography slope granite

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Morphometric analysis of the Andaman outer shelf and upper slope——Implications for the recent slope failure events

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Acta Oceanologica Sinica 2023年第9期42卷 44-52页

作者： Pachoenchoke Jintasaeranee Anond Snidvongs Department of Aquatic Science Faculty of ScienceBurapha UniversityChonburi 20131Thailand Department of Marine Science Faculty of ScienceChulalongkorn UniversityBangkok 10330Thailand

The devastating 2004 tsunamis that hit the southwestern coast of Thailand pose a serious threat to people along the coastal zone. A major aim for the tsunami hazard prediction is better prediction of the next tsunamis and their impacts. In this paper, we present the first implications of recent slope failure events of the Andaman outer shelf and upper slope based on a new detailed bathymetric data and subbottom profiler records acquired during two cruises of the MASS project in 2006 and 2007. Morphometric analysis reveals a variety of anomalous features,including: three large plateaus surrounded by moats, ruggedness and unevenness of slope morphology, and two translational submarine landslides. Two submarine landslides are studied from the detailed bathymetric data and subbottom profiler record covering the upper slope of the Andaman Sea shelf break within Thai exclusive economic zone. Maximum approximated volumes of both displaced masses are 4.8×10~7 m~3 and 2.2×10~7 m~*** the data, there is no evidence that landslides have been the sources for tsunami hazard potential in recent geological time. These prerequisites will allow better study of slope failure events in the area. Further investigation is required to better understand obvious geotectonic phenomena.

关键词： Andaman slope failure submarine landslide bathymetry hazard potential

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Implementation of absorbing boundary conditions in dynamic simulation of the material point method

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2021年第11期22卷 870-881页

作者： Zhi-gang SHAN Zhe-xian LIAO You-kou DONG Dong WANG Lan CUI Zhejiang Huadong Construction Engineering Corporation Limited Hangzhou 310014China Zhejiang Engineering Research Center of Marine Geotechnical Investigation Technology and Equipment Hangzhou 310014China College of Marine Science and Technology China University of GeosciencesWuhan 430074China Hubei Key Laboratory of Marine Geological Resources China University of GeosciencesWuhan 430074China College of Environmental Science and Engineering Ocean University of ChinaQingdao 266100China State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan 430071China

Outgoing waves arising from high-velocity impacts between soil and structure can be reflected by the conventional truncated *** boundary conditions(ABCs),to attenuate the energy of the outward waves,are necessary to ensure the proper representation of the kinematic field and the accurate quantification of impact *** this paper,damping layer and dashpot ABCs are implemented in the material point method(MPM)with slight *** scenarios of different dynamic problems are modelled with the ABCs *** of the ABCs is assessed through the velocity fluctuations at specific observation points and the impact force fluctuations on the *** impact forces predicted by the MPM with ABCs are verified by comparison with those estimated using a computational fluid dynamics approach.

关键词： Material point method(MPM) Absorbing boundary condition(ABC) submarine landslide Impact

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Marine Geohazards： Review and Future Perspective

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Acta Geologica Sinica(English Edition) 2016年第4期90卷 1455-1470页

作者： JIA Yonggang ZHU Chaoqi LIU Liping WANG Dong Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering (Ocean University of China) Qingdao Shandong 266100 China Laboratory for Marine Geology Qingdao National Laboratory for Marine Science and Technology Qingdao Shandong 266061 China Key Laboratory of Marine Environment and Ecology Ministry of Education Ocean University of China Qingdao Shandong 266100 China

With offshore resource exploration moving to the deep water, marine geohazards have been attracting attention from the academic and industry. Research achievements of marine geohazards were reviewed in this paper. We analyzed and discussed typical issues among marine geohazards, including coastal erosion, submarine slope failure, turbidity current and special hazards induced by gas hydrate dissociation, in terms of their definition, distribution, characteristics and case studies. Major international projects on marine geohazards headed by the United States, Europe, Japan and other international organizations are introduced as well. Three marine geohazard survey methods, including geophysical survey, geotechnical exploration and in-situ observation, were summarized with a brief description of each approach, respectively. Especially, the history of marine geohazard researches in China is briefly reviewed, showing the disparity between China and developed countries in the study of marine geohazards narrows gradually. The potential research tendency in future was suggested.

关键词： marine geohazards submarine landslide gas hydrate coastal erosion in-situ observation

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Stability of submarine slopes in the northern South China Sea: a numerical approach

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Chinese Journal of Oceanology and Limnology 2013年第1期31卷 146-158页

作者：张亮栾锡武 Key Laboratory of Marine Geology and Environment Institute of OceanologyChinese Academy of Sciences Graduate University of Chinese Academy of Sciences Key Laboratory of Marine Hydrocarbon Resources and Environmental Geology Ministry of Land and Resources Qingdao Institute of Marine Geology

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 （4=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.

关键词： submarine landslide factor of safety earthquake South China Sea

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