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Advances in Motion Characteristics of Submarine Debris Flow

Yu Heyu;Liu Xiaolei;Lu Yang;Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering,Ocean University of China;Laboratory for Marine Geology and Environment,Pilot National Laboratory for Marine Science and Technology;  
The cognition of the motion characteristics of submarine debris flow is directly related to the correct understanding of the submarine sediments mass transport, and also has a significant impact on the submarine oil and gas resources exploitation and the security construction of marine engineering facilities. The research advances of motion characteristics are limited by the uncertainty of onset time and space of submarine debris flow as well as the lack of direct observation methods. Based on the research progress at home and abroad, this paper discusses the influencing factors of submarine debris flow movement, the hydroplaning generated at the flow head and the transformation mechanism of debris flows into turbidity currents. The paper also summarizes the main research methods such as field observation, model test and numerical simulation and current problems in the study of the motion characteristics of submarine debris flow were pointed out. We suggest that the further research can be carried out around the improvement of the field observation technology system, the further clarification of the long runout distance transport mechanism and the risk assessment of geological hazards caused by submarine debris flow.
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