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1998年6～8月长江流域经历了一次特大洪水,在洪水期间,以10mgL~(-1)的悬沙浓度为标志,长江悬沙的影响范围可达123°E.在122°15E附近,悬沙浓度显示出成层现象,底层浓度约为表层浓度的3倍,这一现象主要与物质沉降过程有关.在126°E～127°E之间悬沙浓度最低,代表了黑潮水的特征.在调查期间,长江悬沙扩散的范围比冬季枯水季节有相当程度的扩大,但向NE方向扩散的趋势并不明显.在陆架区,形成了若干个次级高悬沙浓度中心,其原因可能是底质再悬浮,也可能是高悬沙浓度水体的运动.为了弄清研究区内长江细粒沉积物的输运和堆积过程及其对化学物质通量的影响,需要结合多学科(流场、温盐度、营养盐等)数据进行分析.本文根据长江口外海域悬沙浓度的调查结果,结合历史观测数据,初步分析了长江口外海域夏季悬沙浓度特征.
During the period from June to August 1998, the Yangtze River basin experienced an extraordinarily large flood. During the flood period, the suspended sediment concentration of 10 mg L -1 was marked as 123 ° E. At around 122 ° 15E, Suspended sediment concentration showed stratification, the bottom concentration of about 3 times the surface concentration, the phenomenon is mainly related to material deposition process in 126 ° E ~ 127 ° E between the lowest concentration of suspended sediment, representing the characteristics of Kuroshio During the investigation period, the scope of the suspended sediment diffusion in the Yangtze River expanded to a considerable extent compared with the winter dry season, but the trend of spreading to the NE direction was not obvious.In the shelf area, several secondary suspended sediment concentration centers were formed, The reason may be the resuspension of sediment or the movement of suspended sediment concentration water.In order to understand the transport and accumulation process of fine sediment in the Yangtze River and its influence on chemical flux, it is necessary to combine multidisciplinary (Flow field, temperature and salinity, nutrients, etc.) .In this paper, based on the survey results of suspended sediment concentration in the waters off the Changjiang Estuary and the historical observation data, the characteristics of summer suspended sediment concentration in the waters off the Changjiang Estuary were analyzed.