| 基于EOF法的长江口高潮位时空变化特征研究——长时间序列的高潮位EOF分析 |
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| 引用本文： | 史源,陶建峰,龚政,谭亚.基于EOF法的长江口高潮位时空变化特征研究——长时间序列的高潮位EOF分析[J].海洋通报,2019,38(3). |
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| 作者姓名： | 史源 陶建峰 龚政 谭亚 |
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| 作者单位： | 河海大学水文水资源与水利工程科学国家重点实验室,江苏 南京 210098;河海大学 港口海岸与近海工程学院,江苏 南京 210098;河海大学水文水资源与水利工程科学国家重点实验室,江苏 南京 210098;河海大学 港口海岸与近海工程学院,江苏 南京 210098;河海大学水文水资源与水利工程科学国家重点实验室,江苏 南京 210098;河海大学 港口海岸与近海工程学院,江苏 南京 210098;河海大学水文水资源与水利工程科学国家重点实验室,江苏 南京 210098;河海大学 港口海岸与近海工程学院,江苏 南京 210098 |
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| 基金项目： | 国家重点基础研究发展计划课题 |
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| 摘 要： | 根据长江口6个主要潮位站1993-2008年潮位资料,通过经验正交函数分析法(EOF法)分析了长时间序列和三峡工程前后月平均高潮位变化规律以及2000年的日高潮位变化规律,并探究其影响因素。结果表明:EOF分析前三个主成分贡献率为98.19%,可以反映潮位变化的主要过程。EOF1的影响因子是径流量,在空间上均为正值,呈上游至下游递减趋势,时间系数呈季节性变化;EOF2的影响因子是月平均海平面变化,在空间上有明显的分布差异,时间系数总体有上升趋势。三峡工程前后影响因子的作用有一定变化,径流量的影响增强,海平面减小。徐六泾以上河段的潮位站受径流丰枯影响,徐六泾以下高潮位受平均海平面控制更大。
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| 关 键 词： | 长江口 潮位 EOF分析 径流量 海平面 |
| 收稿时间： | 2018/9/4 0:00:00 |
| 修稿时间： | 2019/2/15 0:00:00 |
EOF analysis of factors contributing to the temporal and spatial variations of high tidal level in the Yangtze River Estuary |
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| SHI Yuan,TAO Jian-feng,GONG Zheng and TAN Ya.EOF analysis of factors contributing to the temporal and spatial variations of high tidal level in the Yangtze River Estuary[J].Marine Science Bulletin,2019,38(3). |
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| Authors: | SHI Yuan TAO Jian-feng GONG Zheng and TAN Ya |
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| Institution: | State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China; College of Harbor, Coastal and Offshore Engineering, Hohai University, Nanjing 210098, China,State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China; College of Harbor, Coastal and Offshore Engineering, Hohai University, Nanjing 210098, China,State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China; College of Harbor, Coastal and Offshore Engineering, Hohai University, Nanjing 210098, China and State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China; College of Harbor, Coastal and Offshore Engineering, Hohai University, Nanjing 210098, China |
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| Abstract: | The evolution tendency of the high tidal level during 1993-2008, before and after the Three Gorges Project in the Yangtze River Estuary and the corresponding contributory factors were studied using Empirical Orthogonal Function (EOF) method. Historical tidal level data in six main tidal stations in the Yangtze River Estuary from 1993 to 2008 were analyzed. The variations of the first three eigenvectors are up to 98.19 %, representing the main processes of the variation of the tidal level. The influence factor of EOF1 is discharge, which is positive in space and shows a decreasing trend form upstream to downstream. The time factor is seasonal variation. The influence factor of EOF2 is sea level rising. EOF2 shows significant difference in distribution, and the time factor generally has an upward trend. The influence factors of the Three Gorges Projects have changed significantly, and the influence of discharge has been increased while the effect of sea level has decreased. However, the annual mean high tidal level of the upper reaches fluctuated with the annual discharge variation, while the annual mean high tidal level of the down reaches is mainly controlled by the average sea level |
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| Keywords: | Yangtze River Estuary tidal level EOF analysis discharge sea level |
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