JOURNAL OF YANGTZE RIVER SCIENTIFIC RESEARCH INSTI ›› 2020, Vol. 37 ›› Issue (4): 25-29.DOI: 10.11988/ckyyb.20190746

• WATER RESOURCES AND ENVIRONMENT • Previous Articles     Next Articles

Empirical Model of Critical Flow Rate in Response to Salt Water Intrusion in the Yangtze River Estuary

GAO Hua-bin, TANG Bing   

  1. Department of Water Conservancy Planning,Changjiang Institute of Survey, Planning, Design and Research, Wuhan 430010, China
  • Received:2019-06-28 Online:2020-04-01 Published:2020-05-21

Abstract: Salt water intrusion severely threatens the water supply safety in the Yangtze River estuary. To determine the target (critical) flow rate for the scheduling of repelling salt water, we studied the mechanism of salt tide by establishing an empirical model of the relation among salinity, tidal range, and flow rate into the sea via statistical analysis. We conclude that the critical flow rate is a varying value ranging between 9 390 m3/s and 21 633 m3/s when tidal range is 290-335 cm. In response to salt water intrusion, scheduling of reservoirs in the upstream of Yangtze River alone has no significant effect as it requires large discharge and long time. In conclusion, in practice we should combine the comprehensive scheduling of the whole watershed with the storage of freshwater and repelling salt water in local reservoirs.

Key words: salt tide invasion, critical flow rate, salinity, tidal range, discharge into the sea, multiple regression analysis, principal component analysis, scheduling of repelling salt water, comprehensive scheduling of watershed

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