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A method for simulating sediment incipient motion varying with time and space in an ocean model (FVCOM): development and validation

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Abstract

We modified the sediment incipient motion in a numerical model and evaluated the impact of this modification using a study case of the coastal area around Weihai, China. The modified and unmodified versions of the model were validated by comparing simulated and observed data of currents, waves, and suspended sediment concentrations (SSC) measured from July 25th to July 26th, 2006. A fitted Shields diagram was introduced into the sediment model so that the critical erosional shear stress could vary with time. Thus, the simulated SSC patterns were improved to more closely reflect the observed values, so that the relative error of the variation range decreased by up to 34.5% and the relative error of simulated temporally averaged SSC decreased by up to 36%. In the modified model, the critical shear stress values of the simulated silt with a diameter of 0.035 mm and mud with a diameter of 0.004 mm varied from 0.05 to 0.13 N/m2, and from 0.05 to 0.14 N/m2, respectively, instead of remaining constant in the unmodified model. Besides, a method of applying spatially varying fractions of the mixed grain size sediment improved the simulated SSC distribution to fit better to the remote sensing map and reproduced the zonal area with high SSC between Heini Bay and the erosion groove in the modified model. The Relative Mean Absolute Error was reduced by between 6% and 79%, depending on the regional attributes when we used the modified method to simulate incipient sediment motion. But the modification achieved the higher accuracy in this study at a cost of computation speed decreasing by 1.52%.

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Acknowledgement

The authors appreciate the helpful comments and suggestions provided by Mr. CHI Wanqing and Doctor ZENG Ming. The advices helped us with improving this paper.

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Authors and Affiliations

  1. The First Institute of Oceanographic, State Oceanic Administration, Qingdao, 266061, China

    Zichen Zhu  (朱子晨), Yongzhi Wang  (王勇智), Shuhua Bian  (边淑华), Zejian Hu  (胡泽建), Jianqiang Liu  (刘建强) & Lejun Liu  (刘乐军)

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  1. Zichen Zhu  (朱子晨)
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  2. Yongzhi Wang  (王勇智)
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  4. Zejian Hu  (胡泽建)
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  5. Jianqiang Liu  (刘建强)
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  6. Lejun Liu  (刘乐军)
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Correspondence to Yongzhi Wang  (王勇智).

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Supported by the National Natural Science Foundation of China (Nos. 41276084, 41406100)

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Zhu, Z., Wang, Y., Bian, S. et al. A method for simulating sediment incipient motion varying with time and space in an ocean model (FVCOM): development and validation. J. Ocean. Limnol. 36, 1216–1235 (2018). https://doi.org/10.1007/s00343-018-7096-7

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  • DOI: https://doi.org/10.1007/s00343-018-7096-7

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