| 河口物质和水体长期输运分离的理论分析和观测验证Ⅰ.物质和水体长期输运分离的理论分析 |
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| 引用本文： | 朱首贤,丁平兴,沙文钰,张文静.河口物质和水体长期输运分离的理论分析和观测验证Ⅰ.物质和水体长期输运分离的理论分析[J].海洋学报,2008,30(6). |
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| 作者姓名： | 朱首贤 丁平兴 沙文钰 张文静 |
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| 作者单位： | 河海大学海洋学院，华东师范大学河口海岸国家重点实验室，解放军理工大学气象学院，中国海洋大学海洋环境学院，国家海洋局第二海洋研究所 |
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| 基金项目： | 国家重点基础研究发展计划(973计划)，国家自然科学基金，海洋公益性项目 |
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| 摘 要： | 基于单宽断面潮周期平均水体和物质对流输运通量,定义了二维水体和物质长期输运速度,它们分别描述单宽断面水体和物质长期输运的方向及快慢。通过二维水体和物质长期输运速度的对比分析,提出了物质和水体长期输运分离概念:受物质浓度影响,在物质和水体瞬时运动速度相同的情况下,物质和水体潮周期平均对流输运的方向和快慢可能存在差异。本文将二维物质长期输运速度分解为二维水体长期输运速度、二维潮泵输运速度和垂向切变输运速度,它们分别描述余流输运、潮泵输运和垂向切变输运,后两种输运造成单宽断面物质和水体长期输运分离。本文的分析表明,河口受地形、径流、潮流、密度梯度影响,存在有利于物质和水体长期输运分离的自然条件。
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| 关 键 词： | 河口 物质长期输运 水体长期输运 分离研究 |
The theory analysis and observational validation for the separation of water and substance's long-term transportⅠ.The theory analysis for the separation of water and substance's long-term transport |
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| ZHU Shou-xian,DING Ping-xing,SHA Wen-yu,ZHANG Wen-jing.The theory analysis and observational validation for the separation of water and substance''s long-term transportⅠ.The theory analysis for the separation of water and substance''s long-term transport[J].Acta Oceanologica Sinica (in Chinese),2008,30(6). |
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| Authors: | ZHU Shou-xian DING Ping-xing SHA Wen-yu ZHANG Wen-jing |
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| Abstract: | Based on the tide-averaged convection flux of water and substance at unit length vertical section,2-D water and substance's long-term transport velocity is defined,which describe the water and substance's long-term transport direction and speed at unit length vertical section.2-D water and substance's long-term transport velocity can also introduce the separation of water and substance's long-term transport,namely in the case that substance's convection velocity is as same as water's at every tide phase,their tide-averaged convection velocity may be different in direction and speed because of substance concentration's impact.2-D substance's long-term transport velocity is decomposed as 2-D water's long-term transport velocity,2-D tide pumping transport velocity and vertical shear transport velocity,which describe the substance's long-term transport from residual current transport,tide pumping transport and vertical shear transport respectively.Tide pumping transport and vertical shear transport result in the difference of water and substance's long-term transport at unit length vertical section.In estuary,the topographty,river flux,tidal current and density grads make favorable entironment for the separation of water and substance's long-term transport. |
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| Keywords: | estuary the substance's long-term transport the water's long-term transport separation study |
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