摘要
长江口是中国第一大河入海处,其环境最显著的特点是因为长江入海径流而产生长江冲淡水、长江入海泥沙、入海营养盐和有机物等都有显著的季节变化。由于长江入海年径流量约为9千亿m^3。这祥,长江口外的余流和盐-淡水混合是引人注目的问题。国内许多学者对于这方面进行过调查和研究。其中长江口外关于夏季流轴和盐舌转向东北的原因,迄今还没有取得一致的意见。
The distributions of residual current and salinity at the Changjiang River Estuary were computed for summer and winter by using finite-difference method based on two-dimensional nonlinear equation of motion and salinity diffusion equation. The results show that residual current flow northeastward because of influence of south wind in summer, but, in winter, they flow south-westward or southeastward because of influence of north wind. The distribution of salinity corresponds to that of residual currents. Salt tongue tends to be northeastward in summer, but southeastward in winter. Besides,the distributions of isohaline outside of the Changjiang River Estuary were usually westward as a result of less discharge during the winter season. According to those analyses above, author also roughly predicted the possible effects of the Threb Gorges project.
出处
《海洋与湖沼》
CAS
CSCD
北大核心
1990年第1期92-96,共5页
Oceanologia Et Limnologia Sinica
