RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2017, Vol. 26 >> Issue (01): 82-90.doi: 10.11870/cjlyzyyhj201701010

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ANALYSIS OF HYDRODYNAMICS IN YANGSHAN SEA BEFORE AND AFTER THE PROJECT

YANG Zhong-yong1, SHI Xiao-tao1, WU Ze-yan1, GUO Xin-jie2, ZHANG Yong3   

  1. 1. College of Hydraulic and Environment Engineering, China Three Gorges University, Yichang 443002, China;
    2. Shanghai Institute of Geological Survey, 930 Lingshi Rd., Shanghai 200072, China;
    3. Three Gorges Navigation Authority, Yichang 443000, China
  • Received:2016-04-29 Revised:2016-07-12 Online:2017-01-20
  • Supported by:
    National Natural Science Foundation of China (41506103);Talent Foundation of China Three Gorges University (KJ2014B032)

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Abstract: Started from October, 2002, the project of Yangshan Harbor is based on the Northern island chain by closing three main fork channels. Hydrodynamics are influenced significantly in this sea area due to this large-scale project. The observation data from several ADCP transects during October, 2002 and October, 2008 indicated that, the speed of tidal current during flood period decreased in the whole sea except near the Xiaoyangshan Island. The speed of tidal current during ebb period increased in the whole sea, but the variation range of velocity is not as significantly as that of topography changing in the eastern Yangshan Sea. To study these hydrodynamic phenomena and their variation characteristics before and after the project, five ADCP transects with seven measurements of current data in the sea were collected. In addition, a numerical model developed from FVCOM (Finite Volume Coastal Ocean Model) was applied in this sea to reproduce the situations before the project. Our results suggest that, the decrease of tidal current during flood period was mainly resulted from the decrease in flood tidal volume after the fork-closure project. However, the western flood current near the Xiaoyangshan Island was deflected to northward on the effect Coriolis force, thus the flood current near that island showed a slight increase after the project. Furthermore, the numerical experiment indicated that, the Coriolis force exerted little influence on the ebb currents, probably due to the irregular island lines on the south island chain. Since the outlet over the eastern sea dramatic converged after the project, the ebb current increased. However, the convergence of the eastern outlet also induced an occurrence of dammed water, causing a relative small increasing range of ebb velocity after the project. It should be noted that, the water level would rise up in the area near the Xiaoyangshan Island, mainly caused by the encounter of two strong flood currents. During flood period, the water level in the whole sea area after project was lower than that before project, indicating that there is no dam water occurred. Mainly caused by the tide wave reflection due to the northern straight landline, a relative longer period and larger scale of weak current field occurred after the project.

Key words: Yangshan deep water Harbor, hydrodynamics, coriolis force, dammed water, weak tide current.

CLC Number: 

  • P75
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