| Formation of Equilibrium Beach Profile of the Abandoned Yellow River Delta Coast in North Jiangsu |
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| 作者姓名： | XU Min |
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| 作者单位： | Department of Geography，Nanjing Normal University，Harbour and River Department，Nanjing Hydraulic Research Institute，Harbour and River Department，Nanjing Hydraulic Research Institute Nanjing 210098，China，Nanjing 210024，China，Nanjing 210024，China |
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| 摘 要： | The abandoned Yellow River Delta coast is a typical erodible silty and muddy coast in China. The paper analyses the marine dynamic characteristics and the mechanism of beach erosion of this area. Analysis and calculation show that in this sea area wave and tidal current action should be considered. Based on the above analysis, an equilibrium beach profile calculation model is developed, in which the wave-current interaction is considered while sediment supply and sediment re-deposition are neglected. The model consists of four parts: (1) calculation of wave parameters, (2) calculation of velocity due to wave-current interaction at different water depth, (3) calculation of friction velocity and shear stress at different water depths, and (4) calculation of the amount of sediment erosion, erosion intensity and variation of beach profile. Calculated results are in good agreement with observed data. Finally, the evolution tendency is discussed and the equilibrium beach profile of this coast is calculated. B
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Formation of Equilibrium Beach Profile of the Abandoned Yellow River Delta Coast in North Jiangsu |
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| XU Min LU Peidongand LEI Zhiyi.Formation of Equilibrium Beach Profile of the Abandoned Yellow River Delta Coast in North Jiangsu[J].China Ocean Engineering,2001(1):139-146. |
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| Authors: | XU Min LU Peidongand LEI Zhiyi |
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| Institution: | Department of Geography, Nanjing Normal University, Nanjing 210098, China Harbour and River Department, Nanjing Hydraulic Research Institute, Nanjing 210024, China Harbour and River Department, Nanjing Hydraulic Research Institute, Nanjing 210024, China |
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| Abstract: | The abandoned Yellow River Delta coast is a typical erodible silty and muddy coast in China. The paper analyses the marine dynamic characteristics and the mechanism of beach erosion of this area. Analysis and calculation show that in this sea area wave and tidal current action should be considered. Based on the above analysis, an equilibrium beach profile calculation model is developed, in which the wave-current interaction is considered while sediment supply and sediment re-deposition are neglected. The model consists of four parts: (1) calculation of wave parameters, (2) calculation of velocity due to wave-current interaction at different water depth, (3) calculation of friction velocity and shear stress at different water depths, and (4) calculation of the amount of sediment erosion, erosion intensity and variation of beach profile. Calculated results are in good agreement with observed data. Finally, the evolution tendency is discussed and the equilibrium beach profile of this coast is calculated. Based on prediction, the slope of equilibrium beach profile is about 1/85. |
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| Keywords: | equilibrium beach profile wave-current interaction silty and muddy coast abandoned Yellow River Delta |
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