摘要
潮区界和潮流界是表征河口水动力作用的关键界面,是认识径流和潮流共同作用下泥沙输移和河床演变的基础。通过大通-徐六泾实测资料整理和分析,建立潮流界和潮区界位置的经验曲线,得到相同潮径组合下潮区界和潮流界相隔距离约为384km,即通过潮区界变化过程可探求潮流界年内和年际变化过程。主要成果为:年内潮流界最上端为501km,最下端可达口门附近;月均最上为434km,月均最下为155km,最大变幅为280km;潮区界年均位置、洪季平均及枯季平均位置分别为673km、617km、728km,潮流界多年洪季平均、枯季平均及年均位置分别为233km、344km、289km;90系列设计调度下潮流界位置10月和11月月均上溯最大达28km,下移距离月均最大达15km,洪季界面变化不大,枯季界面均值位置下移约3.2km,年均位置下移约1.8km。
Tide limit and tidal current limit are the key interface characterized by dynamic change in estuaries, which are also the foundation to realize the sediment transport and channel process under runoff and tidal currents. Based on the measured data from Datong to Xuliujin, this paper analyses the process of tide limit and tidal current limit from 1989 to 1990 and from 2004 to 2005, and gets the distance between the above two limits was about 384km in the same combination of runoff and tidal current. The bibliographic data also showed it is reasonable that the annual and monthly process of tidal current limit can be obtained through the process of tide limit. The main results are the furthest annual tidal current limit was 501km above the entrance and the nearest was near the entrance; the monthly tidal current limit was 434km above the entrance, the nea- rest was 155kin, and the maximum amplitude was 280km. The average locations of tide limit in a year, in flood seasons and in dry seasons were 673km, 617km, 728km respectively. The average locations of tidal curren limit in flood seasons, in dry seasons and in a year were 233km, 344km, 289km, respectively. The loca- tions of tide limit and tidal current limit are not fixed in years. The tide limit in October and November moved upstream 28kin and downstream 15kin and it remained unchanged in flood seasons under the condition of wa- ter-sediment/series regulation of 1990＇S of TGP; while the tide limit moved downstream 3.2km in dry seasons and the annal postion moved downstream 1.8km.
出处
《泥沙研究》
CSCD
北大核心
2012年第6期46-51,共6页
Journal of Sediment Research
基金
国家973项目重大水利工程影响下河口水沙和地貌变化过程(2010CB429002)
关键词
潮流界
潮区界
变化过程
长江口
工程响应
tidal current limit
tide limit
process
Yangtze estuary
engineering impact response
