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Wave flume experiments on the contribution of seabed fluidization to sediment resuspension 被引量:6
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作者 ZHANG Shaotong JIA Yonggang +5 位作者 WANG Zhenhao WEN Mingzheng LU Fang ZHANG Yaqi LIU Xiaolei SHAN Hongxian 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2018年第3期80-87,共8页
Sediment resuspension is commonly assumed to be eroded from the seabed surface by an excess bottom shear stress and evolves in layers from the top down. Although considerable investigations have argued the importance ... Sediment resuspension is commonly assumed to be eroded from the seabed surface by an excess bottom shear stress and evolves in layers from the top down. Although considerable investigations have argued the importance of wave-induced seabed fluidization in affecting the sediment resuspension, few studies have been able to reliably evaluate its quantitative contribution till now. Attempt is made to preliminarily quantify the contribution of fluidization to resuspension using a series of large-scale wave flume experiments. The experimental results indicated that fluidization of the sandy silts of the Huanghe Delta account for 52.5% and 66.8% of the total resuspension under model scales of 4/20 and 6/20(i.e., relative water depth: the ratio of wave height to water depth), respectively. Some previously reported results obtained using the same flume and sediments are also summarized for a contrastive analysis, through which not only the positive correlation is confirmed, but also a parametric equation for depicting the relationship between the contribution of fluidization and the model scale is established. Finally, the contribution of fluidization is attributed to two physical mechanisms:(1) an attenuation of the erosion resistance of fluidized sediments in surface layers due to the disappearing of original cohesion and the uplifting effect resulting from upward seepage flows, and(2) seepage pumping of fines from the interior to the surface of fluidized seabed. 展开更多
关键词 EROSION shear stress seepage flows pore pressure build up fine-grained particles Huanghe Delta
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Mixed Carbonate-Siliciclastic Deposits in a Channel Complex in the Northern South China Sea 被引量:3
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作者 Benjun Ma Shiguo Wu +3 位作者 Lijun Mi Thomas Lüdmann Jinwei Gao Wei Gao 《Journal of Earth Science》 SCIE CAS CSCD 2018年第3期707-720,共14页
New high-resolution 3D seismic data image a submarine channel complex in the northern slope of the South China Sea. The channel complex stretches hundreds of kilometers across the slope and flows into the deepsea from... New high-resolution 3D seismic data image a submarine channel complex in the northern slope of the South China Sea. The channel complex stretches hundreds of kilometers across the slope and flows into the deepsea from the siliciclastic shelf margin, linking neritic environment to the pelagic plain. The evolution of the channel complex developed two sedimentary stages, stage Ⅰ (19.1-18.5 Ma) and stage Ⅱ (18.5-17.5 Ma), separated by erosional surfaces. In the first stage, the complex was rifled with pure siliciclastic sediments, forming thick-massive sandstone intercalated by thin layers of mudstone. During the stage Ⅱ, the channel complex was deposited five carbonate-siliciclastic cycles. The unexpected channel-fifl carbonate deposits present allochthonous characteristics, suggesting the siliciclastic channel was surprisingly used to transport carbonate sediment from the adjacent neritic carbonate platform. By analyzing the periodical carbonate sedimentary process in the siliciclastic channel complex, we infer that it was related to the in situ carbonate production of the neritic carbonate platform and was most likely to be controlled by the relative sea-level changes. Unlike line-source carbonate slope aprons or smafl-sized carbonate channels, the large-sized siliciclastic channel complex links directly neritic carbonate platform to deepwater basin and can transport large volumes of neritic carbonates to the pelagic environment in a short period. The new findings help to estimate the contributions of neritie siliciclastic shelf and carbonate platform to deepwater slope more accurately. This study suggests that channel systems are more complex than expected and have significant implications on the conceptual models describing the deepwater sedimentary theory. 展开更多
关键词 submarine channels mixed carbonate-siliciclastic deposits allochthonous carbonate sediment flux SEDIMENTOLOGY South China Sea.
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