海洋通报
海洋通報
해양통보
MARINE SCIENCE BULLETIN
2014年
4期
428-435
,共8页
刘高伟%程和琴%计娜%乔远英%胡浩%王冬梅
劉高偉%程和琴%計娜%喬遠英%鬍浩%王鼕梅
류고위%정화금%계나%교원영%호호%왕동매
含沙量%优势流%大型工程%长江河口
含沙量%優勢流%大型工程%長江河口
함사량%우세류%대형공정%장강하구
suspended sediment concentration%preferential flow%large-scale engineering projects%Yangtze Estuary
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。
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現場水文觀測資料，以及1999、2002、2003、2004、2005、2006、2007、2010年歷史水文測驗資料，分析潮流歷時、流速、優勢流和含沙量等水沙現狀和變化特徵，併探討近年來該水域水沙變化的主要影響因素。結果錶明：（1）目前北港上段河道水域落潮佔主導優勢；青草沙水庫和長江大橋建成後，落潮優勢明顯增彊，洪季大潮漲、落潮垂線平均含沙量減少，枯季大潮漲、落潮垂線平均含沙量增多；（2）流域徑流量的季節性變化是造成北港上段河道水域垂線平均流速洪季大、枯季小的主要原因；大型工程的建設是該水域落潮優勢增彊的主要影響因素；北港上段河道水域含沙量變化可能與近岸工程建設、入海泥沙量減少等因素有關。
기우2011년12월화2012년6월홍、고계대조북항상단하도수역적현장수문관측자료，이급1999、2002、2003、2004、2005、2006、2007、2010년역사수문측험자료，분석조류력시、류속、우세류화함사량등수사현상화변화특정，병탐토근년래해수역수사변화적주요영향인소。결과표명：（1）목전북항상단하도수역락조점주도우세；청초사수고화장강대교건성후，락조우세명현증강，홍계대조창、락조수선평균함사량감소，고계대조창、락조수선평균함사량증다；（2）류역경류량적계절성변화시조성북항상단하도수역수선평균류속홍계대、고계소적주요원인；대형공정적건설시해수역락조우세증강적주요영향인소；북항상단하도수역함사량변화가능여근안공정건설、입해니사량감소등인소유관。
The tidal current duration (TCD) and velocity (TCV) and the suspended sediment concentration (SSC) were measured in the dry season in December 2011 and in the flood season in June 2012 in the upper part of the North Channel of the Yangtze Estuary. They were assimilated with the measured data in 2003, 2004, 2006 and 2007, using the tidal range's proportion conversion. Variations in TCD and TCV, preferential flow and SSC have been calculated. Influences of typical engineering projects such as Qingcaosha fresh water reservoir, Yangtze River Bridge, and land reclamation on the ebb and flood TCD, TCV and SSC in the North Channel for last 10 years were discussed. The results showed that: (1) currently, in the upper part of North Channel, the ebb tide dominated;after the construction of the typical projects, ebb TCD and TCV tended to be larger and the depth-averaged flood and ebb SSC decreased during the flood season while SSC increased during the dry season; (2) changes in the depth-averaged TCV were mainly contributed by the seasonal runoff variation during the flood season, which was larger in the flood season than that in the dry season;the controlling factors of increasing ebb TCD and TCV were those large-scale engineering projects in the North Channel; variation in SSC might mainly result from the reduction of basin annual sediment loads, large-scale nearshore projects and so on.
