Characteristics of temporal and spatial variation of salinity and their indicating significance in the Changjiang Estuary
Characteristics of temporal and spatial variation of salinity and their indicating significance in the Changjiang Estuary
复制标题
DOI：
--
复制
发表时间：
2004
影响因子：
1.4
通讯作者：
K. Ya-zhen
中科院分区：
文献类型：
--
作者：
K. Ya-zhen
2003年2月和7月分别在长江口进行了大尺度水文观测。调查范围从江阴至口外-20 m等深，测站分布在4个口门。实地观察表明：（1）盐度的时空变化主要受径流量、口门分流比、潮差和地貌状况的控制，（2）盐度分布由高到低的顺序为北分支、南槽、北槽、北槽;（3）枯水期北分支盐水向南分支回流，丰水期北分支一半以上断面仍为淡水所持;北槽口部盐度潮汐变化大，季节变化小，具有咸淡水分层界面，南槽盐度潮汐变化小，季节变化大，具有中强混合型特征;北通道的情况介于北通道和南通道之间;（4）盐度的时空变化反映了北分支的流量分配比，北槽和南槽在汛期有一定程度的增加。
Large scale hydrological observations in the Changjiang Estuary have been respectively carried out in February and July, 2003. The survey range extends from Jiangyin to -20 m iso-depth out of the mouth, and the measuring stations distribute in four outlets. Field observations show that: (1) temporal and spatial variation of salinity is mainly controlled runoff discharge, flow distribution ratio of the outlets, tidal range and geomorphologic situation; (2) the order from high to low for the distribution of salinity is the North Branch, South Passage, North Passage, and the North Channel; (3) the saltwater flows backwards from the North Branch to the South Branch during the dry season, but more than half section of the North Branch is still held by freshwater during the flood season; the mouth sector of the North Channel, where tidal variation of salinity is major and seasonal variation is minor, has stratified interface between saltwater and freshwater; the South Passage, where tidal variation of salinity is minor and seasonal variation is major, is characteristic of mid-strongly mixed type; and the situation of the North Passage is between situations of the North Channel and the South Passage; (4) the temporal and spatial variation of salinity reflects that flow distribution ratio to the North Branch, the North Channel and the South Passage increases to a certain extent in the flood season.