摘要
以瓯江河口为例,通过建立河口段物理模型进行了水流试验。通过试验资料及天然实测资料的优势流计算,研究了河口区域径流量和潮流量的比值与其动力平衡特征的关系。结果显示,动力平衡点的位置与径流量和潮流量的比值关系密切,径流量与潮流量的比值越大,滞流点越向下游,反之则滞流点越往上游摆动。而河口水下地势变化与动力平衡区域的关系也说明了动力平衡区域可以促使泥沙的聚集,这与拦门沙的形成关系密切。通过强潮河口优势流的计算,可以较清晰地分析该河口段主要动力的强弱,有利于自然现象的分析。
Oujiang Estuary was taken as an example in this paper to study the relationship between the ratio of the runoff and the tidal current and its dynamic balance characteristics, where a physical model of the estuary was constructed to simulate the current movement. The dominant current of the estuary which was calculated according to the various situation of the runoff and tidal current from the physical model and actual observation records, was used to analyze the dynamic balance characteristics of runoff and tidal current for macro - tidal estuary areas. The result showed that the location of the dynamic balance point of the macro - tidal estuary had a nearly connection with the ratio of the runoff and tidal current, the stagnation point went lower reach while the ratio was large and the stagnation point went up reach while it was a little ratio. The relationship between the topographical change and the location of the dynamic balance areas also showed that the dynamic balance areas could cause sediment accumulation, which related to the formation of the dune in and out estuary. According to the calculation of the dominant current, we could clearly analyze the strength of the main dynamic force for the macro - tidal estuary, in order to find out the regulation of the natural phenomenon.
出处
《水道港口》
2009年第1期20-25,共6页
Journal of Waterway and Harbor
关键词
动力平衡点
优势流
河口地形
瓯江河口
the point of dynamic balance
dominant current
estuarine topography
Oujiang Estuary
