| Physical Modeling of Localized Scour for the Yangtze Estuary Waterway Improvement Project,Phase Ⅰ |
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| 作者单位： | JIA Jianjun，LU Wujiang QIAN Yadong
1 Ph. D. Candidate，School of Harbor，Waterway and Coast Engineering，Hohai University，Nanjing 210098;Institute of Oceanology，Chinese Academy of Sciences，Qingdao 266071，P. R. China
2 Professor，School of Harbor，Waterway and Coast Engineering，Hohai University，Nanjing 210098，P. R. China
3 Lecturer，School of Geographic Sciences，Nanjing Normal University，Nanjing 210097，P. R. China |
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| 摘 要： | In order to examine the effectiveness of engineering protection against localized scour in frontof the south groin-group of the Yangtze Estuary Waterway Improvement Project,Phase I,an undistort-ed physical model on a geometric scale of 1:250 is built in this study,covering two groins and their adacentestuarine areas.By use of rinsing fix-bed model as well as localized mobile-bed model,the experiment isundertaken under bi-directional steady flow.According to the experimental results,waterway dredgingleads to the increase in steram velocity,the increase being larger during the ebb than during the flood.Con-struction of the upstream groin has some influence on the flow patterns near the downstream groin.Local-ized scour in front of the groin-heads is controlled mainly by ebb flow.In the case of a riverbed composedentirely 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 ve
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