长江河口盐度锋  

SALINITY FRONTS IN THE CHANGJIANG RIVER ESTUARY

作　　者：胡方西[1] 胡辉[1] 谷国传[1] 苏诚[2] 顾学俊[2] 

机构地区：[1]华东师范大学河口海岸研究所,上海200062 [2]国家海洋局东海分局,上海200137

出　　处：《海洋与湖沼》1995年第S1期23-31,共9页Oceanologia Et Limnologia Sinica

基　　金：国家自然科学重大基金!9487005

摘　　要：根据1988－1991年河口锋面现场调查、上海市海岸带调查及历次标准断面调查资料对长江盐度场及盐度锋进行了分析，提出了由口门至外海纵向上存在着三级锋面现象：内侧锋面即长江河口锋为长江河口水与长江冲淡水的界面；羽状锋是长江口羽状流水与口外混合水的界面，它是长江口最主要的盐度锋面，也是长江口一个重要的生物地球化学带，对河口沉积过程及水下三角洲发育具有重要的影响。外侧锋面即海洋锋，是长江冲淡水的最外边缘。This paper reports results of analysis of data records and of multi-subject invstigations on the salinity fronts and salinity field in the Changjiang River Estuary summarized as follows:(1) Based on the cliaracteristics of the water zone in the Changjiang River and the suspended sediment concentration and salinity, the waters here can be divided into Changjiang runoff, estuarine water, diluted water (further divided into plume water and mixing water outside the estuary) and oceanic water.(2) The Changjiang Estuary has three salinity fronts From the river mouth to the sea; estuarine front, plupoe front and ocean front. The estuarine front is the boundary between the estuarine water and plume water, is located outside the estuary, near the water depth of 10m has surface salinity of 5 to 17, and is characterized by large horizontal gradient and the obvious suspended sediments. The plume front is the boundary of the plume water with the mixing water out of the estuary,has surface salinity of 20 to 27, and is characterized by a large horizontal gradient and an obvious vertical stratification. The front is the outer margin of the Chang-jiang di1uted water and has surface salinity of 30 and 31.(3) The plume front, the most important salinity front in the, Changjiang estuary, greatly affects the biology, chemistry, hydrology and sedimentation, and is an estuarine biogeochemistry zone. Moreover, it also plays an important role in the development of the submerged Changjiang delta and its sedimentation. So it is taken as the outer margin of the Changjiang Estuary.

关 键 词：盐度 河口锋 羽状锋 

分 类 号：P731.1[天文地球—海洋科学]