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基于2011年12月和2012年6月洪、枯季大潮北港上段河道水域的现场水文观测资料,以及1999、2002、2003、2004、2005、2006、2007、2010年历史水文测验资料,分析潮流历时、流速、优势流和含沙量等水沙现状和变化特征,并探讨近年来该水域水沙变化的主要影响因素。结果表明:(1)目前北港上段河道水域落潮占主导优势;青草沙水库和长江大桥建成后,落潮优势明显增强,洪季大潮涨、落潮垂线平均含沙量减少,枯季大潮涨、落潮垂线平均含沙量增多;(2)流域径流量的季节性变化是造成北港上段河道水域垂线平均流速洪季大、枯季小的主要原因;大型工程的建设是该水域落潮优势增强的主要影响因素;北港上段河道水域含沙量变化可能与近岸工程建设、入海泥沙量减少等因素有关。
Based on the on-the-spot hydrographic data of the upper reaches of the North Harbor in December and June 2012 in Hong and the tide of the tide, the historical hydrographic data of 1999, 2002, 2003, 2004, 2005, 2006, 2007 and 2010 , Flow rate, dominant flow and sediment concentration and so on, as well as the main influencing factors of water and sediment changes in this area in recent years. The results show that: (1) At present, the ebb tide of the upper reaches of the Beigang River dominates. After the completion of the Qingcaosha Reservoir and the Yangtze River Bridge, the ebb tide advantage is obviously enhanced. The tide rises in the monsoon season, the average sediment concentration in the ebb tide decreases, The average vertical sediment concentration increased; (2) The seasonal variation of runoff in the watershed was the main cause of the large average flood velocities and small dry season in the upper reaches of the Beigang River. The construction of large-scale projects was enhanced by the low tide advantage of the watershed The main influencing factors are as follows: The change of sediment concentration in the upper reaches of Beigang may be related to the construction of nearshore projects and the decrease of sediment load into the sea.