Study on the Shape of Estuary of Lingdingyang Bay by HE Wei

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Lingdingyang Bay Sediment Deposition Model Test by Zhou Jia-yu, Wu Men-wu, Yan Li, Wu Tian-sheng

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Analysis of Hydrodynamic Environment of Lingdingyang Bay and Improvement Strategy by 徐峰俊, 朱士康, 王华

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Deposition Dynamic Characteristics in Lingdingyang Bay and Training of Water and Silt by HE Wei, LI Chun-chu

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Primary Study on Current Alluvium Force in Riverbed and Beach in Lingdingyang by HE Yong, Huang Yan

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Study on the Relation between Tidal Power and Shape of Baymouth in Lingdingyang Bay by 沈汉堃, 陈丽棠, 黄希敏, 朱三华

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Impact Analysis of Various Difference Schemes on the Numerical Calculation for Lingdingyang Bay by 朱三华, 徐欣, 王贤平, 易灵

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The evolution and morphodynamic characteristics of shoals and troughs in Lingdingyang Bay of the Pearl River Estuary by Linxi Fu, Linxi Fu, Yuhang Zhong, Yuhang Zhong, Ping Zhang, Ping Zhang, Lixia Niu, Lixia Niu, Xiaohe Zhang, Xiaohe Zhang, Jianliang Lin, Jianliang Lin, Huayang Cai, Huayang Cai, Qingshu Yang, Qingshu Yang

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Three-dimensional mathematical model for transport of salinity in Lingdingyang under wave-current interaction by YANG Li-ling, XU Feng-jun

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Numerical Modeling of the Effects of Land-based Sources of Pollution on Water Quality in Lingdingyang Estuary by LONG Jiang, LI Xue-ling

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Analysis of Silt Movement and Erosion and Sediment Evolution Rules in Lingdingyang Bay in Pearl River Estuary Comprehensive Regulation Planning Scheme by HE Yong, HU Xiao-zhang

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A New Concept Proposal of the Tidal Level Designed for the Security of Coastal Levee during Storm Surge — Taking the Lingdingyang Estuary as an Example by LI Bin, HE Yong, FANG Shenguang

“…Based on the analysis of the design frequency tidal levels,storm surge water increase and flood inflow upstream of control stations in Lingdingyang Estuary over years,it showed that the tidal levels of designed frequency of 0.5%~2.0% raised from 0.2 to 1.0 m in recent years,the extreme storm surge elevations exceed 2.5 m commonly,and the current tidal level difference of adjacent design frequency was less than 0.2 m.During the emergence of the extreme storm surge elevation in the estuary flood upstream would not be appeared simutaneously,while the moderate tide was most likely encounterred.Therefore,there were some problems in the application of design frequency tidal levels in estuarine waters,such as the small tidal level difference between adjacent frequencies,the severe frequency jump of tide level during strong typhoon,and the failure to directly reflect the leading role of the extreme storm surge elevation in the elevation design of coastal levee.The concept of the tidal levels designed for storm surge security of coastal levee was proposed in the paper,which were composed of multi-year average high tidal level and the maximum extreme storm surge elevation,clearly and easily to be used.It highlights the main role played by coastal levee to resist the disaster by strong storm surge.The calculated values were close to and slightly more than the designed tidal levels of 100~200 year return period of main stations in the mouth of Lingdingyang estuary,Shiziyang water area and delta river network area after reviewed in 2020,proving its safety and reliability.The reviewed tidal levels of designed frequency in the Chiwan station in 2020 were likely too high by analysis preliminarily.The tidal level designed for storm surge security of coastal levee could be widely used in reinforcement design,safety risk assessment in storm surge and storm surge disaster warning and response.…”
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Temporal and Spatial Characteristics of Tidal Current in the Eastern Waters of Macao in Summer by FANG Shenguang, HUANG Chunhua, YU Fenghua, WANG Shijun, HE Yong

“…The eastern waters of Macao at the Pearl River Estuary are an important channel for water and sediment discharged by the west beach of Lingdingyang Estuary and Macao waterway.The measured data during the flood seasons shows that the waters feature semi-diurnal tidal currents,and the average velocity in this area is about 21~23 cm/s during the flood and 18~29 cm/s during the ebb.The flowing direction is stable,namely,N—NNW trending during the flood and S trending during the ebb,and tidal power is stronger in the south.The average velocity in the waters is mainly dependent on the tidal type,and the flood runoff mainly affects residual currents and tidal duration.A stagnant area is formed in the north of the waters during the flood,and the water and sediment in the south are transported outside the Lingdingyang Estuary.Wind on the sea surface has a significant impact on the vertical dynamic structure of flow in the range of 40% water depth,and residual flow direction in the range of 10% water depth near the sea surface has a good follow-up.During southwest wind,the maximum horizontal flow velocity gradient appears in the second flood and ebb stage and corresponds to the occurrence of the maximum sediment concentration in the tidal cycle.Due to the shallow water depth in the north of the waters,the bed shear gradient force is generally greater than that in the south.As a result,the sediment concentration observed in the north of the waters is significantly higher than that in the southeast.According to the comprehensive analysis,astronomical tides,flood runoff,and wind are the main controlling dynamic factors in the waters.The friction resistance of shallow water in the north is drastically larger than that in the south,which leads to a significant difference in tidal duration and phases of vertical floods and ebbs.As a consequence,the special vertical dynamic structure of convergence on the surface and dispersion at the bottom is formed in the waters,which is strengthened by massive freshwater runoffs during the flood seasons.This leads to the trend of surface diluted water drifting to the east and the invasion of the nearshore by bottom high-salt water.…”
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Analysis of Hydrodynamic Characteristics of Semi-Enclosed Harbors—a Cause Study of Xiangzhou Port by YANG Yugui, XUAN Xiaoming, LIU Guozhen, TONG Xiaolei, YUAN Fei

“…Affected by the construction of a series of projects,the semi-enclosed harbor often appears the phenomenon of weakening hydrodynamic force and worsening water exchange.In order to study the impact of project construction on the hydrodynamic environment of semi-closed harbors,a typical semi-enclosed port,namely Xiangzhou Fishing Port,in the Pearl River Estuary was taken as an example,and the impact of detailed control planning of the surrounding areas on flood discharge,tidal influx,and water exchange in Xiangzhou Fishing Port was studied.The results show that after the implementation of the planning scheme,the water level of the water area near the planning area and the upstream entrance gate,as well as the tidal volume of the tidal channel on the west side of Lingdingyang change slightly,but the tidal volume in the area of Xiangzhou Port decreases by about 1%.The hydrodynamic force is further weakened,and the semi-exchange cycle of the water body increases by about 3.2%.In particular,the water exchange capacity in the northwest corner of the port area is relatively poor,which is unfavorable to the water environment for a long time,and it is necessary to take hydrodynamic enhancement measures.The research results can provide a reference for hydrodynamic improvement in the water area of Xiangzhou Port.…”
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