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Impacts of human interventions on the seasonal and nodal dynamics of the M_(2)and K_(1)tidal constituents in Lingdingyang Bay of the Zhujiang River Delta,China

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Acta Oceanologica Sinica 2021年第10期40卷 49-64页

作者： Ping Zhang Qingshu Yang Haidong Pan Heng Wang Meifang Xie Huayang Cai Nanyang Chu Liangwen Jia Institute of Estuarine and Coastal Research School of Marine Engineering and TechnologySun Yat-sen UniversityZhuhai 519082China Guangdong Provincial Engineering Research Center of Coasts Islands and ReefsZhuhai 519082China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519080China Key Laboratory of Physical Oceanography Ministry of EducationQingdao 266100China School of Marine Science Sun Yat-sen UniversityZhuhai 519082China

Natural and human-induced changes may exert considerable impacts on the seasonal and nodal dynamics of M2 and K1 tidal ***,quantifying the influences of these factors on tidal regime changes is essential for sustainable water resources management in coastal *** this study,the enhanced harmonic analysis was applied to extract the seasonal variability of the M2 and K1 tidal amplitudes and phases at three gauging stations along Lingdingyang Bay of the Zhujiang River *** seasonal dynamics in terms of tidal wave celerity and amplification/damping rate were used to quantify the impacts of human-induced estuarine morphological alterations on M2 and K1 tidal hydrodynamics in inner and outer Lingdingyang *** results show that both tidal amplification/damping rate and wave celerity were considerably increased from the pre-anthropogenic activity period(Pre-AAP)to the post-anthropogenic activity period(Post-AAP)excepting the tidal amplification/damping rate in outer Lingdingyang Bay,and the variations in outer Lingdingyang Bay was larger than those in inner Lingdingyang *** alterations in these two parameters were more significant in flood season than in dry season in both inner and outer Lingdingyang *** seasonal variability of M2 and K1 tidal amplitudes were further quantified using a regression model accounting for the 18.61-year lunar nodal modulation,where this study observes a considerable alteration in M2 constituent owing to human *** the Post-AAP,the M2 amplitudes at the downstream station were larger than those that would have occurred in the absence of strong human interventions,whereas the opposite was true for the upstream station,leading to a substantial decrease in tidal amplification in outer Lingdingyang ***,it is opposite in inner Lingdingyang *** underlying mechanism can be primarily attributed to channel deepening and narrowing caused by human interventions,that resulted in substan

关键词： tidal dynamics S_(T)IDE model nodal modulation channel deepening tidal wave celerity

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The Marine dynamics and Changing Trend off the Modern Yellow River Mouth

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Journal of Ocean University of China 2015年第3期14卷 433-445页

作者： WANG Nan LI Guangxue XU Jishang QIAO Lulu DADA Olusegun A. ZHOU Chunyan College of Marine Geosciences Ocean University of China Key Laboratory of Submarine Sciences and Prospecting Techniques MOE Ocean University of China Department of Marine Science and Technology Federal University of Technology State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Hohai University

Topography around the Yellow River mouth has changed greatly in recent years, but studies on the current state of ma- rine dynamics off the Yellow River mouth are relatively scarce. This paper uses a two-dimension numerical model （MIKE 21） to reveal the tidal and wave dynamics in 2012, and conducts comparative analysis of the changes from 1996 to 2012. The results show that M2 amphidromic point moved southeastward by 11 kin. It further reveals that the tides around the Yellow River mouth are relatively stable due to the small variations in the tidal constituents. Over the study period, there is no noticeable change in the distribution of tidal types and tidal range, and the mean tidal range off the river mouth during the period studied is 0.5-1.1 m. However, the tidal currents changed greatly due to large change in topography. It is observed that the area with strong tidal currents shifted from the old river mouth （1976-1996） to the modem river mouth （1996-present）. While the tidal current speeds decreased continually off the old river mouth, they increased off the modem river mouth. The Maximum tidal Current Speed （MTCS） reached 1.4 m s-1, and the maximum current speed of 50-year return period reached 2.8 m s-1. Waves also changed greatly due to change in topography. The significant wave height （H1/3） of 50-year return period changed proportionately with the water depth, and the ratio of Hi/3 to depth being 0.4-0.6. H1/3 of the 50-year return period in erosion zone increased continually with increasing water depth, and the rate of change varied between 0.06 and 0.07myr-1. Based on the results of this study, we infer that in the future, the modem river mouth will protrude gradually northward, while the erosion zone, comprising the old river mouth and area between the modern river mouth and the old river mouth （Intermediate region） will continue to erode. As the modem river mouth protrudes towards the sea, there will be a gradual increase in the current speed and dec

关键词： Yellow River mouth tidal dynamics wave numerical simulation change trend 50-year return period

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