摘要
近期长江感潮河段径、潮动力已然发生变化,但其变化机制与趋势有待进一步探讨。通过对长江大通至南京河段的野外调查,并分析了近40年来大通、芜湖和南京站水文资料,探讨了近期该河段的潮动力变化机制与趋势。结果表明:近年来长江大通至南京段潮动力有增强趋势。具体表现为相近径流量条件,潮差平均增大约10cm,主要分潮振幅增加10%~30%,潮汐形态系数有减小趋势。引起上述变化的原因可能有:(1)近期感潮河段整体冲刷变深导致潮波上溯阻力减小;(2)口外潮汐动力增强以及海平面上升等使潮汐上溯能力增强。此外,长江流域修建了大量水库群,导致该河段径流量变化由自然因素主导变成自然与人为调控共同作用为主,从而影响了潮动力的相对强弱。
The hydrodynamic of runoff and tide in tidal river of the Yangtze River has changed recently. Therefore, it's necessary to further understand the related mechanism and predict it's tendency. The changing mechanism and trend of tidal dynamics in Datong-Nanjing Reach has been analyzed by the hydrological data at Datong, Wuhu and Nanjing Station in recent 40 years and Long-term field investigation. Results show that the tidal range increased by 10 cm, the amplitude of major tidal component increased 10 %~30 %, and the potential phase decreased under the same flow condition. It is believed that the reasons for the above changes may be as follows:(1)The overall scour and morphology change of tidal reach lead to the decrease of upstream transmission resistance;(2)The tidal upstream transmission capacity increased for the increasing tidal energy off the coast and rising sea level. In addition, a large number of reservoirs have been built in the Yangtze River basin, which leads to the change of runoff in section from natural factors to natural and artificial regulation, thus affecting the relative strength of tidal dynamics.
作者
袁小婷
程和琴
郑树伟
石盛玉
马玉改
YUAN Xiao-ting;CHENG He-qin;ZHENG Shu-wei;SHI Sheng-yu;MA Yu-gai(State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China;Chongming Ecological Research Institute, Shanghai 200062, China;College of Geography and Environment, Shandong Normal University,Jinan 250358, China;Shanghai Project Management Company Limited, Shanghai 200433, China;College of Resource and Environmental Sciences, Shijiazhuang College, Shijiazhuang 050035, China)
出处
《海洋通报》
CAS
CSCD
北大核心
2019年第5期553-561,共9页
Marine Science Bulletin
基金
国家自然科学基金国际（地区）合作与交流项目（51761135023）
关键词
潮差
变化机制
趋势分析
分潮振幅
长江河口
tidal range
change mechanism
trend analysis
constituent amplitude
Yangtze River Estuary
