山东荣成月湖潮汐汊道的时间-流速不对称特征  

Patterns of time-velocity asymmetry at the Yuehu Inlet, Shandong Peninsula, China

作　　者：贾建军[1] 高抒[1] 薛允传[2] 

机构地区：[1]南京大学海岸与海岛开发教育部重点实验室,江苏南京210093 [2]中国科学院地理科学与资源研究所,资源与环境信息国家重点实验室,北京100101

出　　处：《海洋学报》2003年第3期68-76,共9页

基　　金：国家杰出青年科学基金(49725612);国家自然科学基金青年基金(40206006)

摘　　要：月湖是山东半岛东端的一个小型潮汐汊道。在月湖进行了潮位、潮汐观测及地形测量,运用两种方法从潮位记录推算出口门落潮主干道垂线平均流速和断面平均流速。发现除涨潮优势型和落潮优势型外,月湖还表现出另外两种时间-流速不对称,即涨潮历时大于落潮历时且涨潮流速大于落潮流速、涨潮历时小于落潮历时且涨潮流速小于落潮流速。月湖的时间-流速不对称特征与不规则潮汐、涨(落)潮的流速跟潮位的匹配关系、汊道口门的断面形态、口门特殊的水流结构及循环过程等因素有关。时间-流速不对称类型的研究,对于理解潮汐汊道系统的沉积动力行为及进行人工整治有一定意义。The Yuehu is a small tidal inlet system located in the eastern Shandong Peninsula, China. In order to investigate the time-velocity asymmetric patterns of the system, hydrodynamic observations and bathymetric surveys were undertaken in the winter of 1998 and the summer of 1999. Based upon the measured tidal water levels and the calculated tidal currents, two types of additional time-velocity asymmetric patterns, other than the ' flood-dominated' and 'ebb-dominated'patterns, are identified: the duration of flood tide is longer (or shorter) than that of ebb tide, while the flood currents are stronger (or weaker) than the ebb currents. These patterns have been shown to be associated with the mixed and semi-diurnal dominated tides, the timing of the current velocity and water level at the entrance, the cross-section shape of the entrance channel, and the flow and circulation structures within the entrance channel. An understanding of such time-velocity asymmetric patterns is important in terms of the sediment dynamic behaviours and the artificial utilization of tidal inlets.

关 键 词：潮汐汊道 潮位 潮流 月湖 时间-流速不对称 

分 类 号：P736.21[天文地球—海洋地质]