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The runoff of the Huanghe contains a great amount of suspended load and forms the high-density underflows (hyperpycnal currents) at the river mouth. The sediments over the subaqneous delta are mainly transported by the underflow. The sediment texture gradually get fining seawards, which relates to the attenuation of the hyperpycnal currents and hypopycnal plumes. Being hydraulically equivalent to the medlum-silt-sized quartz, which is the dominant component in the sediments, the clastic mica concentrates on the delta. The maximum thickness of the subaqueous delta is about 16m and the period of accumulation lasted from 12 to 16 years, therefore its sedimentary rate ranges from 110 to 130 cm/a. 相似文献
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黄河水下三角洲的动力沉积特征 总被引：4，自引：0，他引：4
本文根据1985—1988年期间进行的综合海上调查及室内研究结果确定,黄河径流在口门处形成高密度潜流,是水下三角洲沉积物的主要搬运营力.由口门向外沉积物发生结构递变,与潜流及表层羽体流的逐渐衰减有关.水下三角洲堆积体的最大厚度为16m,堆积时间为12—15a,沉积速率达110—130cm/a. 相似文献
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