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

doi:10.1007/s00343-018-7096-7

	A method for simulating sediment incipient motion varying with time and space in an ocean model (FVCOM): development and validation
	Zhu Zichen; Wang Yongzhi; Bian Shuhua; Hu Zejian; Liu Jianqiang; Liu Lejun
刊名	JOURNAL OF OCEANOLOGY AND LIMNOLOGY
	2018-07
卷号	36 期号:4 页码:1216-1235
关键词	sediment model incipient motion suspended load critical shear stress for erosion fraction of mixed grain size sediment
ISSN号	2096-5508
DOI	10.1007/s00343-018-7096-7
英文摘要	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/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%.
资助项目	National Natural Science Foundation of China[41276084] ; National Natural Science Foundation of China[41406100]
WOS关键词	CRITICAL SHEAR-STRESS ; COHESIVE SEDIMENTS ; EROSION THRESHOLD ; VENICE LAGOON ; TRANSPORT ; BED ; DYNAMICS ; RATES ; WAVE
WOS研究方向	Marine & Freshwater Biology ; Oceanography
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000441231100018
内容类型	期刊论文
源URL	[http://ir.fio.com.cn:8080/handle/2SI8HI0U/27327]
专题	自然资源部第一海洋研究所
通讯作者	Wang Yongzhi
作者单位	State Ocean Adm, Inst Oceanog 1, Qingdao 266061, Peoples R China
推荐引用方式 GB/T 7714	Zhu Zichen,Wang Yongzhi,Bian Shuhua,et al. A method for simulating sediment incipient motion varying with time and space in an ocean model (FVCOM): development and validation[J]. JOURNAL OF OCEANOLOGY AND LIMNOLOGY,2018,36(4):1216-1235.
APA	Zhu Zichen,Wang Yongzhi,Bian Shuhua,Hu Zejian,Liu Jianqiang,&Liu Lejun.(2018).A method for simulating sediment incipient motion varying with time and space in an ocean model (FVCOM): development and validation.JOURNAL OF OCEANOLOGY AND LIMNOLOGY,36(4),1216-1235.
MLA	Zhu Zichen,et al."A method for simulating sediment incipient motion varying with time and space in an ocean model (FVCOM): development and validation".JOURNAL OF OCEANOLOGY AND LIMNOLOGY 36.4(2018):1216-1235.