Physical modeling of localized scour for the Yangtze Estuary Waterway Improvement Project, Phase I

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	Physical modeling of localized scour for the Yangtze Estuary Waterway Improvement Project, Phase I
	Jia, JJ ; Lu, WJ ; Qian, YD
刊名	CHINA OCEAN ENGINEERING
	2000
卷号	14 期号:4 页码:473-484
关键词	Yangtze Estuary Physical Modelling Localized Scour Waterway Dredging Groin
ISSN号	0890-5487
文献子类	Article
英文摘要	In order to examine the effectiveness of engineering protection against localized scour in front of the south groin-group of the Yangtze Estuary Waterway Improvement Project, Phase I, an undistorted physical model on a geometric scale of 1:250 is built in this study, covering two groins and their adacent estuarine areas. By use of rinsing fix-bed model as well as localized mobile-bed model the experiment is undertaken under bi-directional steady flow. According to the experimental results, waterway dredging leads to the increase in steram velocity, the increase being larger during the ebb than during the flood. Construction of the upstream groin has some influence on the flow patterns near the downstream groin. Localized scour in front of the groin-heads is controlled mainly by ebb flow. In the case of a riverbed composed entirely of silt, the depths of localized scour in front of the two groin-heads are 27 m and 29 m, respectively. In reality, the underneath sediment of the prototype riverbed is clay whose threshold velocity is much higher than the stream velocity in the Yangtze Estuary; therefore, the depths of localized scour will not be much larger than the thickness of the silt layer, i. e. 7.4 m and 4.7 m, respectively. The designed aprons covering the riverbed in fron of the groin-heads are very effective in scour control. Aprons of slightly smaller size can also fulfill the task of protection, but the area of localized scour increases significantly.
学科主题	Engineering, Civil ; Engineering, Ocean ; Engineering, Mechanical ; Water Resources
语种	英语
WOS记录号	WOS:000167146900007
公开日期	2010-12-22
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/3635]
专题	海洋研究所_其他
作者单位	1.Hohai Univ, Sch Harbor Waterway & Coast Engn, Nanjing 210098, Peoples R China 2.Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China 3.Nanjing Normal Univ, Sch Geog Sci, Nanjing 210097, Peoples R China
推荐引用方式 GB/T 7714	Jia, JJ,Lu, WJ,Qian, YD. Physical modeling of localized scour for the Yangtze Estuary Waterway Improvement Project, Phase I[J]. CHINA OCEAN ENGINEERING,2000,14(4):473-484.
APA	Jia, JJ,Lu, WJ,&Qian, YD.(2000).Physical modeling of localized scour for the Yangtze Estuary Waterway Improvement Project, Phase I.CHINA OCEAN ENGINEERING,14(4),473-484.
MLA	Jia, JJ,et al."Physical modeling of localized scour for the Yangtze Estuary Waterway Improvement Project, Phase I".CHINA OCEAN ENGINEERING 14.4(2000):473-484.