Tidal characteristics in the Changjiang River Estuary
Based on the in situ water level at Hengsha,Majiagang,Baozhen,Yonglongsha,Chongxi and Nanmen tide gauges from January 1 to December 31 in 2009,the tidal temporal and spatial variations,tidal constituents,tidal form and distortion in the Changjiang Estuary were analyzed in this paper.There exists tidal daily inequality that mainly occurs during high tide levels,and is more significant during neap tide than spring tide in March and September while is more significant during spring tide than neap tide in June and December.The monthly maximum and minimum tidal range in each month at the tide gauges was given out statistically.The tidal range in the estuary varies monthly with two peaks,the maximum tidal range has maximum values in March and September,and has minimum values in June and December.The minimum tidal range has maximum values in June and December,and has minimum values in March and September.The tidal range in the South Branch reduced toward upstream due to the river discharge and friction.The tidal range at Yonglongsha tidal gauge is the largest among the 6 tidal gauges because the North Branch has small river discharge division ratio and funnel shape bathymetry.The tide is mainly composed by the 4 semi-diurnal tidal constituent (M2,S2,N2,K2),4 diurnal tidal constituent (K1,O1,P1,Q1) and 3 shallow water tidal constituent (M4,MS4,M6).The semi-diurnal tidal constituents M2 and S2 are the predominant ones,and the shallow water tidal constituents M4 and MS4 are apparent due to the shallow water in the estuary.The tidal form number in the South Branch is larger than 0.25,indicating where the tide is an irregular semi-diurnal tide type there,and is smaller than 0.25 in the North Branch,indicating where the tide is a regular semi-diurnal tide type.The tidal distortion coefficients in the 6 tidal gauges are all larger than 0.1,indicating that the tide at the tide gauges has significant distortion in the Changjiang Estuary,especially at Chongxi and Nanmen in the South Branch with tidal distortion coefficient 0.206 and 0.204.
Changjiang River Estuary tidal range tidal constituents tidal form tidal distortion
Jianrong Zhu Lu Li
State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai, China, 200062
国际会议
The 17th Pacific -Asian Marginal Seas Meeting(第十七届太平洋与亚洲边缘海国际会议)
杭州
英文
167-180
2013-04-23（万方平台首次上网日期，不代表论文的发表时间）