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基于近几年大量的实测资料,对长江口及其邻近海域洪季期间悬沙浓度的时空分布特征进行了分析.结果表明,悬沙浓度空间上以杭州湾测点最高,其次是长江口内、长江口外,舟山海域最低;悬沙平面分布总体态势为近岸高而外海低;长江口纵向上自口内经口门向口外悬沙浓度大致呈“低-高-低”分布,沿杭州湾测点则由西向东逐渐降低;横向比较长江口外海滨四个测点发现其悬沙浓度自北向南顺次升高;悬沙浓度一般由表及底逐渐增大,但在不同水域其主要呈现的垂线结构类型则有所不同.时间上由于潮流的大小潮和潮周期变化,悬沙浓度还存在大小潮和涨落潮周期变化.另外,对长江口及其邻近海域悬沙浓度时空分布特征的原因进行了初步分析.
Based on a large number of measured data in recent years, the spatial and temporal distribution characteristics of suspended sediment concentration in the Yangtze River estuary and its adjacent sea areas during the flood season were analyzed. The results show that the suspended sediment concentration is the highest in Hangzhou Bay, followed by the Yangtze River Estuary, The Yangtze River Estuary, the lowest in Zhoushan sea area; the general trend of suspended sediment distribution is high in nearshore and low in sea level; the vertical distribution of suspended sediment in the mouth of the Yangtze River estuary from mouth to mouth is roughly “low-high-low” The measuring points of the bay gradually decrease from west to east. Compared with the four measuring points outside the estuary of the Yangtze River, the suspended sediment concentration increases from north to south in the horizontal direction. The suspended sediment concentration generally increases gradually from the bottom to the bottom, but in different waters, The vertical type presented is different.Due to the trend of tidal current and tidal cycle, the variation of suspended sediment concentration also has large tidal wave and fluctuating tide period.In addition, the effects of suspended sediment concentration on the Yangtze River estuary and adjacent sea areas The reasons for the distribution of the characteristics of a preliminary analysis.