| 摘要: |
| 1958～2010年,长江口南港河段河槽断面形态呈“U”、“W”型交替发展。基于二维潮流数学模型,模拟了1958、1973、1997、2010年长江口地形条件下的水动力变化,发现南港河段水动力与地形变化密切相关。1958～2010年,南港河段潮差逐渐减小,潮波变形逐渐加剧；潮流与瑞丰沙发展变化联系紧密,1997年,瑞丰沙范围最大时,南港流速平面上呈复式分布,长兴水道为涨潮占优,其他年份,落潮占优,南港主槽始终为落潮占优。1973～2010年,南港分流比始终在50%左右,相对稳定。 |
| 关键词: 长江口 南港 河床演变 CJK3D-WEM 潮流 |
| DOI： |
| 分类号: |
| 基金项目: |
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| Hydrodynamic Analysis of South Channel in Yangtze Estuary under Terrain Variation |
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Qian Mingxia, Lu Chuanteng
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Nanjing
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| Abstract: |
| From 1958 to 2010, the riverbed section of South channel developed alternately in the form of "U" and "W" in Yangtze Estuary. Based on 2D tidal current mathematical model, the hydrodynamic variation is simulated with the topographic in Yangtze Estuary in 1958, 1973, 1997 and 2010 separately. It is found that the hydrodynamic variation of South channel is closely related to the topographic. From 1958 to 2010, the tidal range of South channel decreases gradually, and the tidal wave deformation intensifies gradually. Tidal current is closely related to Ruifengsha development. In 1997, the flow velocity of South channel shows a compound distribution on the plane while the range of Ruifengsha is the largest, and ebb tide dominates in Changxing passage. From 1973 to 2010, the diversion ratio of South channel is always around 50%, which is relatively stable. |
| Key words: Yangtze Estuary South channel riverbed development CJK3D-WEM tidal current |
