胶州湾海域潮流动力特征及其与含沙量的关系

摘要

Based on the observation data of suspended sediment concentration (SSC), current velocity and direction in Jaozhou Bay, the tidal current characteristics were analyzed by applying the tidal current quasi-harmonic; method for short-term data, Combining SSC data, the dynamics relation between SSC and the tidal current was also discussed. The results show that the tidal current in the studied area is classified as regular semidiurnal tidal current. The east component of semidiurnal current is generally stronger than the north one. The tidal current is mainly the rectilinear with Slight rotation of flow. At flood tide,the tidal current is in the direction of west, and at ebb tide, the current is in the direction of east. As the alternation of the flood and ebb tide and the change of velocity, the SSC shows obvious cyclical changes. The peak of SSC corresponds with the characteristics of regular semidiurnal tidal current, and almost every peak of flow corresponds to a peak of SSC. The SSC is related to the tidal current during a tide, and the maximum concentration appears when the current maximum velocity has reached. The velocity and sediment discharge at the entrance of Jiaozhou Bay is largest, and the sediment discharge of the flood tide is larger than that of the ebb tide. The direction of sediment transport is west.%根据2009年胶州湾海域的悬沙、流速、流向的实测资料,应用短期资料的潮流准调和分析方法,对连续海流资料进行了分析,并结合悬沙资料,对含沙量与潮流之间动力关系进行了探讨.研究结果表明:该海域潮流属于正规半日潮流性质,半日分潮流的东分量大于北分量,潮流以带有旋转性质的往复流为主,涨潮流流向偏西,落潮流流向偏东.胶州湾内含沙量分布特征与海底沉积物粒径特征基本一致.合沙量在涨落潮的交替和流速的更迭作用下出现明显的周期性变化,含沙量的峰值基本与海域半日潮流特点相对应,几乎每1个流速峰值对应1个含沙量的峰值,含沙量的峰值一般出现在流速峰值之后.胶州湾口处流速和单宽输沙量都为最大,涨潮单宽输沙量大于落潮单宽输沙量,输沙方向为偏西向.