摘要
本文通过对海水中悬浮体样品的过滤、分析及结合海水透光度测量,得出了1983年11月和1984年7月海水中悬浮体的平面分布和垂直分布模式,即:水平分布有三个高含量区和两个低含量区,黄河及长江的现代输入物质对中部深水区基本上没有影响;垂直分布出现明显的层化现象,11月份,在密度跃层下缘出现悬浮体跃层。本区悬浮体含量和成分,具有陆间海的过渡性特征。悬浮体的主要来源是海底沉积物的再悬浮,其次是河流输入物和浮游生物。海浪是影响悬浮体分布的主要因素。潮流加强了海浪的作用,并与海流一起,将掀起的物质搬运他处。海底地形在一定条件下,控制了海浪作用的临界深度。黄海中部冷水团影响了悬浮体的水平扩散和垂直扩散。
Suspended matter in sea water has been investigated in the South Yellow Sea during 1983-1984. The result shows that horizontal distribution of suspended matter might be divided into five regions: The region off Northern Jiangsu coast, characterized by highest concentration of more than 200 mg/L in surface water; the region off the estuary of the Changjiang River and off the Chengshanjiao Cap with high concentration of suspended matter; the region of central part of the South Yellow Sea and off the Haizhou Bay with low concentration; the region around the Chengshanjiao Cap with turbid water carrying sediment from the Huanghe River stretching westward and exering influence on the northwest part of this area; the tongue shaped region with higher concentration of 20 mg/L extending to the northeast and exerting influence on the south part of the investigated area. The central region of the South Yellow Sea are not immediately affected by present sediments discharged from the Huanghe and Changjiang Rivers.The vertical distribution of the suspended matter is clearly stratified. It is interesting to note that there is a layer around which concentration variation gradient of suspended matter is larger. It looks similar to pycnocline or thermocline, so it might be called 'suspended-cline'. Its depth is located under the pycnocline and perhaps having effect on some important properties of sea water by mixing liguid with various suspended matter.Most of the suspended matter is those resuspended from sea floor and the sediments from rivers and biogenic matter. The concentration and component of suspended matter are different from those in the semi-closed Bohai Sea and over the outer continental shelf in the East China Sea.Main factor influencing the concentration distribution of suspended matter is wave. Sediment loads from the rivers only affect the estuary and nearshore areas. Tidal current strengthens the action of wave on sediment on sea floor. Cold water mass in the central region of the South Yellow Sea also exert influence on horizontal and vertical dispersion of suspended matter.
出处
《海洋与湖沼》
CAS
CSCD
北大核心
1989年第2期101-112,共12页
Oceanologia Et Limnologia Sinica
