摘要
根据1962—1983年大量观测资料研究表明,鄱阳湖湖流主要有吞吐流和风生流,因江湖关系而导致吞吐流呈顺畅型、倒灌型和顶托型分布。其时程变化规律是日变化小,年内呈马鞍型变化,年际变化显著且呈周期性。面上分布不均衡,湖流大小的顺序是湖口水道、五河入湖区、主湖区、湖湾区。垂直分布,顺畅型接近对数曲线,倒灌型和顶托型复杂多变。低水河相,流速大,流向规则稳定;高水湖相,流速小,流向紊乱多变。风生流对吞吐流的影响有显著的风向效应和水位高低、湖面宽窄的差异。
The temporal-spatial regularities of Poyang Lake were analysed on the 1962-1983 observations of lake current from 47 Voyages and 34 fixed vertical observation stations at Kang-shan, Tangyin, Duchang and Xingzi.The force that causes the occurrence of Poyang Lake current may be of gravity and wind-driven nature. The gravity current may be of the unimpeded encroached and blocked types each having its own characteristics.Poyang Lake is Strongly affected by the inputs of Changjiang River and five offer saddle rivers. Its yearly variation of water volume is great and the current velocity in the main trough is greater than that in the beach area, varying inversely with the distance between them.Wind-driven current is dominant when Strong wind prevails. A mathematic model was deduced for the wind-driven current in this paper.
出处
《海洋与湖沼》
CAS
CSCD
北大核心
1991年第3期200-207,共8页
Oceanologia Et Limnologia Sinica
