| 摘要: |
| 本文利用Delft3D-Flow模块建立了长江口二维潮流数学模型,通过实测水文资料对模型进行了验证。在此基础上,模拟了长江口各汊道(北支、北港、北槽和南槽)滞流点洪、枯季移动情况,并从各汊道沿程断面的落潮量、涨潮量和落、涨潮量之比3个方面进行了水动力分析。结果显示：洪季,北支滞流点在八滧港东北方向约1.9 km处；在南支各汊道中,北港滞流点位于鸡骨礁东北方向约10.0 km处,北槽滞流点位于牛皮礁东南方向约3.8 km处,南槽滞流点位于大辑山东北方向约14.1 km处。枯季,除北槽外,其余各汊道均出现两个滞流点,且北支的两个滞流点相距最远,分别在灵甸港西南方向约3.2 km处和六滧港东北方向约3.1 km处；在南支各汊道中,北港滞流点分别在鸡骨礁西北方向约25.8 km和20.2 km处,北槽滞流点在横沙以西约5.3 km处,南槽滞流点分别在中浚西北方向约6.5 km和东北方向约5.5 km处。北支滞流点的洪、枯季移动距离为4.6～53.3 km,在南支的各汊道中,北槽滞流点洪、枯季移动距离最大,北港滞流点洪、枯季移动距离最小,南槽居中。长江口各汊道滞流点的移动反映了河流径流和海洋潮流的综合作用。 |
| 关键词: 数值模拟 长江口 滞流点 洪、枯季移动 泥沙淤积 |
| DOI： |
| 分类号:TV92 |
| 基金项目:国家重点基础研究发展计划（2012CB957704） |
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| Numerical analysis of the movement of stagnation points in the Yangtze Estuary during the flood and dry seasons |
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GU Jie,ZHENG Yu-hua,WANG Xiao-li and MA Dan-qing
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College of Marine Sciences,Shanghai Ocean University,Shanghai,201306,College of Marine Sciences,Shanghai Ocean University,Shanghai,201306,College of Marine Sciences,Shanghai Ocean University,Shanghai,201306,College of Marine Sciences,Shanghai Ocean University,Shanghai,201306
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| Abstract: |
| A two-dimensional tidal flow numerical model of the Yangtze Estuary is established based on the Delft3D-FLOW model. The model is well calibrated with the field data and then is employed to simulate and analyze the movement of the stagnation points in the Yangtze Estuary during the flood and dry seasons. Results show that: in the flood season, the stagnation point in the North Branch locates in 1.9 km northeast of Bayao Port; while in the South Branch, the stagnation points in the North Channel, the North and South Passage are in about 10.0 km northeast of Jigujiao, 3.8 km southeast of Niupijiao and 14.1 km northeast of Dajishan, respectively. In the dry season, there are two stagnation points in every channel except for the North Passage；The two points in the North Branch are far away from each other, and lie in about 3.2 km southwest of Lingdian Port and 3.1 km northeast of Liuyao Port respectively; in the South Branch, the stagnation points in the North Channel appear in 25.8 km and 20.2 km northwest of Jigujiao respectively; while the stagnation point in the North Passage locates in 5.3 km west of Hengsha; and two stagnation points in the South Passage are in 6.5 km northwest and 5.5 km northeast of Zhongjun respectively. The seasonal moving range of stagnation points in the North Branch is from 4.6 to 53.3 km, while in the South Branch, the decreased change order of seasonal movement of stagnation point is the North Passage, the South Passage and the North Channel. The movements of stagnation points in four channels in the Yangtze Estuary reflect the combined effects of river runoff and ocean tides. |
| Key words: numerical simulation, the Yangtze Estuary, stagnation point, movement during flood and dry seasons, sediment accumulation |