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A method for simulating sediment incipient motion varying with time and space in an ocean model (FVCOM): development and validation
- Chinese Journal of Oceanology and Limnology Vol. 36, Issue 4, Pages: 1216-1235(2018)
- Affiliations：
The First Institute of Oceanographic, State Oceanic Administration, Qingdao 266061, China
- Author bio：
WANG Yongzhi, wangyongzhi@fio.org.cn
- Funds：
DOI：10.1007/s00343-018-7096-7
CLC：Received：27 March 2017，
Accepted：27 May 2017，
Online First：13 July 2017，
Published：2018-07
- Accepted：
Scan QR Code
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.
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
th
to July 26
th
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
2
and from 0.05 to 0.14 N/m
2
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
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