长江口北槽航槽开挖对水流及河势的影响

Effect on current and river regime induced by dredged channel in the north passage of the Yangtze estuary

基于试验数据和实测地形,初步分析了航槽开挖对长江口北槽水流及河势的影响。结果表明:1)12.5 m航槽开挖引起北槽主槽尤其航槽内流速显著增加;2)在计算北槽航槽开挖后槽内流速时,乐培九公式计算结果吻合较好;3)12.5 m航槽开挖对北槽河势变化产生显著影响,是引起2009年以后北槽河势显著变化的一个主要原因,因此在分析评价长江口深水航道以及其它相关的航道整治工程治理效果时,应充分考虑航槽开挖所带来的影响。

Based on experimental and observed terrain data,we analyze the effect of dredged channel on current and river regime in the North Passage of the Yangtze Estuary.The results show that： 1） The current velocity in the main channel increases significantly after the channel depth is dredged to 12.5 m;2） When calculating the current velocity caused by dredged channel in the north passage,Le Peijiu’s formula is more appropriate;3） Digging of the dredged channel for 12.5 m intensifies the change of river regime in the north passage,which is one of the main reasons of the change of river regime in the North Passage since 2009.The effect of dredged channel should be considered sufficiently in the analysis and evaluation of the regulation effect of the Yangtze Estuary Deepwater Channel Regulation Project and other relevant waterway regulation engineering.