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Dynamical Control of Asymmetrically Oblique Tidal Currents to the Sedimentary Characteristics and Development of Linear Sand Ridges in the Liaodong Shoal, East Bohai Sea

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Abstract

The Liaodong Shoal is a group of linear sand ridges located in the east Bohai Sea of China. In this study, 54 surface sediment samples have been collected, current measurements at 4 stations have been carried out and bathymetric data were obtained. The current directions are rightward deflected relative to the strikes of the sand ridges. Affected by the narrowing effect of the ridge, the current velocities exhibited an anti-‘C’ type vertical profile. The velocities of the lower currents linearly correlate with the water depths. The near-bed current velocities over the troughs are estimated to be higher than those over the ridges, and this feature could be explained by the loss of kinetic energy together with the conversion between kinetic energy and gravitational potential energy. The sedimentary characteristics that are compatible with the tidal dynamics are developed across the ridges and troughs, including grain size compositions, grain size parameters, mineral compositions and Dhm indexes. The existence of the angles between the current directions and the strikes of the sand ridges is the key factor for the growth of the sand ridges. The asymmetric hydrodynamic features between the flood and ebb currents lead to the differences in the topographical and sedimentary characteristics on both sides of a sand ridge. Insufficient material supply led to the degradation of the sand ridges, and the reduction of the tidal current intensity has led to the development of the subordinate sand ridges in the troughs. Sand ridges are migrating.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Nos. 41106039 and 41776059).

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Authors and Affiliations

  1. College of Marine Geosciences, Ocean University of China, Qingdao, 266100, China

    Lianjie Zhang, Longhai Zhu, Jianzheng Wu & Rijun Hu

  2. Key Laboratory of Submarine Geosciences and Prospecting Techniques, Ministry of Education, Ocean University of China, Qingdao, 266100, China

    Longhai Zhu, Jianzheng Wu & Rijun Hu

  3. National Marine Environmental Monitoring Center, Dalian, 116000, China

    Lianjie Zhang, Peng Wang & Pan Zhang

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  1. Lianjie Zhang
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Correspondence to Longhai Zhu.

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Zhang, L., Zhu, L., Wu, J. et al. Dynamical Control of Asymmetrically Oblique Tidal Currents to the Sedimentary Characteristics and Development of Linear Sand Ridges in the Liaodong Shoal, East Bohai Sea. J. Ocean Univ. China 19, 101–112 (2020). https://doi.org/10.1007/s11802-020-3757-1

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  • DOI: https://doi.org/10.1007/s11802-020-3757-1

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