Research Progress and Challenges of Submarine Cyclic Steps |
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| Authors: | Dawei Wang Yue Sun Shaowen Si Shiguo Wu |
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| Institution: | 1.Institute of Deep-sea Science and Engineering，Chinese Academy of Sciences，Sanya Hainan 572000，China;2.University of Chinese Academy of Sciences，Beijing 100049，China;3.Southern Marine Science and Engineering Guangdong Laboratory （Zhuhai），Zhuhai Guangdong 519080，China;4.Qingdao National Laboratory for Marine Science and Technology，Qingdao Shandong 266237，China |
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| Abstract: | Cyclic steps structure derived from the supercritical flows is one of the common bedforms， which is commonly found in sedimentary systems such as delta systems， deep-water canyon-channel systems， and carbonate platforms. In this paper， the research progresses of cyclic steps were introduced from the aspects of sedimentary environment， the features of bedforms， sedimentary structure， formation mechanism， and numerical simulation. The Research scale differences associated with the survey techniques or study methods， such as the ship survey and AUV-based multi-beams， sub-bottom profiles， multichannel seismic， the field outcrop， and numerical simulation were discussed. Finally， the breakthrough directions of the cyclic steps research were given. The combining method of ground penetrating radar， multichannel seismic， drilling and well logging were used to accurately detect the location of field outcrop thalweg. Within the area with water depth greater than 500 meters， the blending of multi-data for the cyclic steps research involved the AUV-based and the ship multi-beams， sub-bottom profiles， and multichannel seismic data. With the in situ samples and observation data obtained by human occupied vehicles， three-dimensional numerical simulation was developed to establish a set of dynamic simulation equations suitable for the real cyclic steps. Therefore， the high resolution three dimensional mode of the deep-water cyclic steps could be obtained more accurately. |
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| Keywords: | Cyclic steps Turbidity currents Supercritical flows Sedimentary structure Scale difference |
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