| 近60年来长江河口河势变化及其对水动力和盐水入侵的影响Ⅱ.水动力 |
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| 引用本文： | 鲍道阳,朱建荣.近60年来长江河口河势变化及其对水动力和盐水入侵的影响Ⅱ.水动力[J].海洋学报,2017,39(2):1-15. |
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| 作者姓名： | 鲍道阳 朱建荣 |
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| 作者单位： | 华东师范大学 河口海岸国家重点实验室, 上海 200062 |
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| 基金项目： | 国家自然科学基金项目（41476077）；上海市科委重点项目（14231200402）。 |
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| 摘 要： | 本文基于本系列论文Ⅰ中数值化的长江河口20世纪50年代、70年代海图获得的岸线和水深资料，以及2012年水深实测资料，设置不同年代模式网格，考虑径流量、潮汐和风应力作用，建立长江河口水动力和盐水入侵三维数值模式，模拟和分析不同年代潮汐潮流、单宽余通量、分汊口水通量和分流比，及其河势变化对它们的影响。最大潮差在3个年代间的变化主要在北支区域，50年代至70年代，北支潮差减小，减小区域集中在北支中段，2012年相比70年代北支潮差增大。单宽水通量在50年代北港大于南港，北支下段向上游输运、上段量值较小，在70年代南港大于北港，北支下段量值较小、上段向下游，在2012年南北港水通量较为接近，北港稍大，整个北支水通量向上游。定量给出了50、70年代和2012年南北支、南北港大潮期间和小潮期间涨潮、落潮和净水量和分流比，结合河势变化分析了不同年代间的变化原因。
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| 关 键 词： | 长江河口 河势变化 潮差 潮流 单宽余通量 分流比 |
| 收稿时间： | 2016/3/4 0:00:00 |
| 修稿时间： | 2016/5/7 0:00:00 |
The effects of river regime changes in the Changjiang Estuary on hydrodynamics and salinity intrusion in the past 60 years Ⅱ. Hydrodynamics |
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| Bao Daoyang and Zhu Jianrong.The effects of river regime changes in the Changjiang Estuary on hydrodynamics and salinity intrusion in the past 60 years Ⅱ. Hydrodynamics[J].Acta Oceanologica Sinica (in Chinese),2017,39(2):1-15. |
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| Authors: | Bao Daoyang and Zhu Jianrong |
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| Affiliation: | State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China |
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| Abstract: | In this paper, with the digitized data of 1950s and 1970s and measured date of 2012, model grids were designed. Considering the effects of runoff, tide and wind stress, a 3D numerical model of Changjiang Estuary was built to simulate and analyze the tide, residual water transport, water flux and split ratio in bifurcations and the effects of river regime changes on them. The changes of the maximum tidal range occurs mainly in the North Branch, the tidal range of middle reaches of the North Branch decreased from 1950s to 1970s, and increased from 1970s to 2012.In 1950s, the residual water transport was greater in the North Channel than in the South Channel,transported toward the upper reaches in the lower reaches of the North Branch and its value was low in the upper reaches of the North Branch. In 1970s, the residual water transport was greater in the South Channel than in the North Channel, transported toward the lower reaches in the upper reaches of the North Branch and its value was low in the lower reaches of the North Branch. In 2012, the residual transport was equivalent in the North Channel and the South Channel,transported toward the upper reaches in the North Branch. The flood, ebb and net water split ratio during spring and neap tide in the North and South Branch, and the North and South Channel in the three times was given and the reason of change was analyzed based on the change of river regime. |
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| Keywords: | Changjiang Estuary river regime change tidal range tidal current residual transport split ratio |
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