华东师范大学学报（自然科学版）Issue(6)：10-19,10.DOI:10.3969/j.issn.1000-5641.2011.06.002
长江河口北支潮位与潮差的时空变化和机理
Spatial and temporal variations and mechanism of the tidal level and range in the North Branch of the Changjiang Estuary
摘要
Abstract
With the combined effects of the river discharge, tide and wind stress, the spatial/ temporal variations as well as the dynamical mechanism of the tidal level and tidal range in the North Branch of the Changjiang Estuary were numerically simulated and quantitatively analyzed in this paper. The monthly mean tidal level in the North Branch is increased gradually from Janu ary to July and decreased gradually from October to December. It mainly depends on the residual water level, which is determined by the amount of the river discharge. The tidal range experi ences a seasonal variation, with two maximum and two minimum values in a year. These two maximum values appear in March (the second lunar month) and September (the eighth lunar month), and the two minimum ones appear in June (the fifth lunar month) and December (the e leventh lunar month), respectively. The highest and lowest tidal levels at the Qinglonggang station are mainly determined by the intensity of tidal forcing, and associate with the seasonal varia tions of the tide and river discharge. The averaged, highest and lowest tidal levels represent a landward increment feature along the North Branch. The tidal range is increased gradually from the mouth to the middle reaches of the North Branch, and decreased from its middle reaches to its upper reaches. The northerly wind in winter tends to produce an increment of the tidal level at the Qinglonggang,and the southerly wind in summer tends to produce a slight decrement of the tidal level and range there. The wind stress has almost no effect on the tidal range in the North Branch. The river discharge increases the tidal level, restrains the tide, and decreased the tidal range.关键词
长江河口/北支/潮位/潮差/影响因子Key words
the Changjiang Estuary/ the North Branch/ tidal level/ tidal range/ impact factors分类
海洋科学引用本文复制引用
宋永港,朱建荣,吴辉..长江河口北支潮位与潮差的时空变化和机理[J].华东师范大学学报（自然科学版）,2011,(6):10-19,10.基金项目
国家自然科学基金(40976056,40806034) （40976056,40806034）
国家水体污染控制与治理科技重大专项(2008ZX07421-001) （2008ZX07421-001）
