A study on wave-induced sediment resuspension on the sea-bed in the Huanghe River Delta in China

JIA Yonggang; ZHANG Ying; LIU Hui; LIU Xiaolei; ZHENG Jiewen; SHAN Hongxian

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JIA Yonggang, ZHANG Ying, LIU Hui, LIU Xiaolei, ZHENG Jiewen, SHAN Hongxian. A study on wave-induced sediment resuspension on the sea-bed in the Huanghe River Delta in China[J]. Haiyang Xuebao, 2012, 34(5): 100-110.

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A study on wave-induced sediment resuspension on the sea-bed in the Huanghe River Delta in China

1.
School of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China;Key Laboratory of Ministory of Education for Marine Environment & Ecology Ocean Universiy of China, Qingdao 266100, China
2.
School of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China
3.
School of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China;Changjiang Project Superrision and Consultant Company, ltd, Changjiang Water Resources Commission, Wuhan 430010, China

Received Date: 2011-09-17
Rev Recd Date: 2012-03-20

Abstract

Abstract

The variation of suspended sediment concentration (SSC) under different waves imposed on sea-bed soils, collected from the modern Huanghe River Delta,is observed in a laboratory flume experiment. Resuspension flux per unit area of sea-bed in different wave heights and action time has been analyzed, together with the settling pattern of sediment in static water since wave stopped.It is shown that the resuspension flux of sea-bed sediments increases with the wave height under a certain water depth with a good linear fitting relationship;the resuspension of sea-bed sediments experiences about 5 000~6 000 wave cycles under the continuous action of certain height waves. At the primary stage of wave action, the difference between the low layer concentration and the middle-upper layer concentration is significant, the vertical concentration structure presents a slanted type. After the distribution of SSC in each water layer is stable,the ratio of SSC on the bottom to that on the surface is about 0.96-1.98 and the SSC uniformly distributes in the whole water.During the hydrostatic sedimentation process,the SSC presents a law of exponential attenuation over time and there is a good negative linear correlation between the SSC and the settlement flux when the SSC is high (greater than 1 g/dm³). The findings can be used for reference in the understanding of wave-induced resuspension process of silty sea-bed sediments in the subaqueous Huanghe River Delta.
- waves,
- sea-floor soil,
- suspended sediment concentration,
- settling flux,
- Huanghe River Delta

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References(34)

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