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

朱子晨; 王勇智; 边淑华; 胡泽建; 刘建强; 刘乐军

doi:10.1007/s00343-018-7096-7

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

Geology | Updated：2023-05-19

- A method for simulating sediment incipient motion varying with time and space in an ocean model (FVCOM): development and validation
- A method for simulating sediment incipient motion varying with time and space in an ocean model (FVCOM): development and validation
- 海洋湖沼学报（英文） 2018年36卷第4期页码：1216-1235
- Affiliations：
  
  The First Institute of Oceanographic, State Oceanic Administration, Qingdao 266061, China
- Author bio：
  
  WANG Yongzhi, wangyongzhi@fio.org.cn
- Funds：
  
  the National Natural Science Foundation of China(41276084);the National Natural Science Foundation of China(41406100)
- DOI：10.1007/s00343-018-7096-7
  中图分类号：
- 收稿：2017-03-27，
  
  录用：2017-5-27，
  
  网络首发：2017-07-13，
  
  纸质出版：2018-07
- Accepted：
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朱子晨, 王勇智, 边淑华, 等. A method for simulating sediment incipient motion varying with time and space in an ocean model (FVCOM): development and validation[J]. 海洋湖沼学报（英文）, 2018,36(4):1216-1235.

Zichen ZHU, Yongzhi WANG, Shuhua BIAN, et al. A method for simulating sediment incipient motion varying with time and space in an ocean model (FVCOM): development and validation[J]. Chinese Journal of Oceanology and Limnology, 2018, 36(4): 1216-1235.
朱子晨, 王勇智, 边淑华, 等. A method for simulating sediment incipient motion varying with time and space in an ocean model (FVCOM): development and validation[J]. 海洋湖沼学报（英文）, 2018,36(4):1216-1235. DOI： 10.1007/s00343-018-7096-7.

Zichen ZHU, Yongzhi WANG, Shuhua BIAN, et al. A method for simulating sediment incipient motion varying with time and space in an ocean model (FVCOM): development and validation[J]. Chinese Journal of Oceanology and Limnology, 2018, 36(4): 1216-1235. DOI： 10.1007/s00343-018-7096-7.

摘要

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 25

to July 26

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/m

and from 0.05 to 0.14 N/m

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%.

关键词

Keywords

references

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