长江口河口锋的悬沙及动力特征初探

Suspended sediments and dynamic characteristics of the estuarine front in the Changjiang Estuary

通过对2002年9月、2003年4月和2004年10月在长江口滨外区多船同步定点观测的数据进行分析,捕捉到了长江口河口锋带位置,并利用调查数据分析了河口锋带的动力特征。结果表明:长江口河口锋的位置大约位于122°10′E,30°50′N至122°20′E,31°00′N一线附近,在河口锋带有着较为强烈的河海相互作用,流速不符合典型的对数流速曲线,河水与海水的相互消长局限于海面以下5 m的表层范围,观测表明在河口锋面区悬浮泥沙为泥沙流伏在海水之上输运。

Field observations were conducted in the September of 2002, the April of 2003 and the October of 2004, respectively, in the Changjiang Estuary in order to study the dynamic characteristics of the estuary front. Using data of current velocity and suspended matter concentration, the location of estuarine front is identified, which locates along the line of 122°10＇E, 30°50＇N to 122°20＇E, 31°00＇N. Due to a strong interaction between river and sea, the changes of current velocities do not correspond with a typical current velocity curve of logarithm. The interaction between river water and sea is confined to 5 m deep. And in the front, the suspended matters are transported above sea water.