A numerical study on water diversion ratio of the Changjiang (Yangtze) estuary in dry season

Lu Li; Jianrong Zhu; Hui Wu; Biao Wang

doi:10.1007/s00343-010-9114-2

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A numerical study on water diversion ratio of the Changjiang (Yangtze) estuary in dry season

Updated：2023-05-16

- A numerical study on water diversion ratio of the Changjiang (Yangtze) estuary in dry season
- Journal of Oceanology and Limnology Vol. 28, Issue 3, Pages: 700-712(2010)
- Affiliations：
  
  State Key Laboratory of Estuarine and Coastal Research East China Normal University
- Author bio：
- Funds：
- DOI：10.1007/s00343-010-9114-2
  CLC：
- Online First：20 May 2010，
  
  Published：2010
- Accepted：
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Li, L., Zhu, J., Wu, H. et al. A numerical study on water diversion ratio of the Changjiang (Yangtze) estuary in dry season., Chin. J. Ocean. Limnol. 28, 700–712 (2010). https://doi.org/10.1007/s00343-010-9114-2
DOI：

Li, L., Zhu, J., Wu, H. et al. A numerical study on water diversion ratio of the Changjiang (Yangtze) estuary in dry season., Chin. J. Ocean. Limnol. 28, 700–712 (2010). https://doi.org/10.1007/s00343-010-9114-2 DOI：

摘要

Abstract

We studied the flood

ebb and tidal averaged along (net) water diversion ratio (WDR) during dry season in the Changjiang (Yangtze) estuary

China

along with the effects of northerly wind

river discharge

tide and their interactions on WDR using the improved version of three-dimensional numerical model ECOM. Using data for annual mean wind speed and river discharge during January

we determined that the flood

ebb

net WDR values in the North Branch of the estuary were 3.48%

1.68%

−4.06% during spring tide

and 4.82%

2.34%

−2.79% during neap tide

respectively. Negative net WDR values denote the transport of water from the North Branch into the South Branch. Using the same data

the corresponding ratios were 50.09%

50.92%

54.97%

and 52.33%

50.15%

43.86% in the North Channel and 38.56%

44.78%

103.96%

and 36.92%

43.17%

60.97% in the North Passage

respectively. When northerly wind speed increased

landward Ekman transport was enhanced in the North Branch

increasing the flood WDR

while the ebb WDR declined and the net WDR exhibited a significant decrease. Similarly

in the North Channel

the flood WDR is increased

the ebb WDR reduced

and the net WDR showed a marked decrease. In the North Passage

the flood WDR also increased while the ebb and net WDR declined. As the river discharge increased

the flood and ebb WDR of the North Branch increased slightly and the net WDR increased markedly. In the North Channel the flood and ebb WDR changed very slightly

while the net WDR declined during spring tides and increased during neap tides. The WDR in the North Passage changed slightly during flood and ebb tides while the net WDR showed a marked increase. The WDR values of different bifurcations and the responses to northerly wind

river discharge

and tide are discussed in comparison with variations in river topography

horizontal wind-induced circulation

and tidal-induced residual current.

关键词

Keywords

references

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