Journal of East China Normal University(Natural Sc ›› 2012, Vol. 2012 ›› Issue (4): 181-189.

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Effect of the deep waterway project on the salinities in the north passage of the Changjiang Estuary

FAN Zhong-ya, GE Jian-zhong, DING Ping-xing, PAN Ling-zhi   

  1. State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China
  • Received:2011-03-01 Revised:2011-06-01 Online:2012-07-25 Published:2014-12-15

Abstract: Unstructured-grid Finite Volume Coastal and Ocean Model (FVCOM) has been applied on the north passage, Changjiang Estuary, to study the salinity distribution and its variations under the impacts of different phases of the deep waterway project (DWP). Driven by the same forcings of freshwater discharge, tide and wind, the spring-neap-averaged and typical tidal moment’s salinity distributions under different phases of DWP are simulated and analyzed The modeling results show that the isohaline has been significantly pushed downstream after Phase I, and continued moving eastward after Phase II. At the same time, the controlling region of isohaline 1‰~5‰ has smoothly increased and the vertical mixing effects seem be weakened from the middle to eastern parts of shipping channel. Strong stratification is revealed along the deep channel. After the Phase III, the controlling region of isohaline 1‰~5‰ still increases with the upstream direction. The onshore saltwater intrusion has significantly intensified as the increased baroclinic gradient force due to deepened eastern channel.

Key words: the Changjiang Estuary, the north passage, the deep waterway project, salinity distribution

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