| 摘要: |
| 将汊道均衡与潮汐特征、纳潮量、淡水径流量及沉积物搬运格局相联系，确定了洋浦港的均衡条件2根据纳潮盆地的水面面积一水面高程曲线以及相关的特征潮位估算平均纳潮量；利用1977－1979年波浪观测资料和CERC公式计算沿岸输沙率；此外，还用改进的Gadd公式确定口门涨、落潮流输沙率，计算中引入汊道口门流速频率分布函数的定义。由此而得洋浦港均衡过水面积为5800 m2，与O’Brien方法所得结果相比，本文方法所引起的相对误差显著减小。 |
| 关键词: 潮汐汊道 均衡过水面积 沉积物搬运 洋浦港 |
| DOI： |
| 分类号: |
| 基金项目:交通水运规划设计院资助项目 |
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| EQUILIBRIUM CROSS-SECTIONAL AREAOF A TIDAL INLET SYSTEM, YANGPU HARBOUR, HAINAN ISLAND |
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Gao Shu1, Zhang Hongxia2
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1.Second Institute of Oceanography, SOA, Hangzkou 310012;2.Zhejiang College of Education, Hangzhou 310012
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| Abstract: |
| An analytical method is developed to investigate equilibrium cross-sectional areas of tidal inlet systems. The equilibrium can be related to tidal characteristics, tidal prism, freshwater input from rivers and sediment transport patterns. The method is used to identify the equilibrium conditions in Yangpu Harbour, Hainan Island. The mean tidal prism is estimated on the basis of the relationship between the basin hypsometry and characteristic tidal water levels. The rate of longshore sediment transport is calculated based upon a CERC formula and use of 1977 – 1979 wave data. For determination of sediment transport rates due to flood and ebb tide currents, the Gadd equation is modified through a definition of the frequency distribution function of current speeds within the harbour entrance. Thus, an equilibrium cross-sectional area of 5 800 m2 for Yangpu Harbour is obtained. The result indicates a much smaller error introduced by the approach developed here than by the O'Brien method. |
| Key words: Tidal inlets, Equilibrium cross-sectional area, Sediment transport, Yangpu Harbour |
