Analysis Of Flow Condition At The Entrance Of Approaching Channel By Open-type Partition Dikes

The development of water resources includes not only flood prevention and electricity generation, but also irrigation and shipping. Shipping plays a very important role in the development of national economy. Therefore, for using water resources synthesisly, navigation structure must build the hydro-junction, which enhances the ability of navigation. At present, navigable structure is the throat of approaching channel, it's located in the edge of hydrodynamic river and still water of approaching channel.Navigation facility is an essential constituent in the hydro-junction building. The flow condition in the entrance of approaching is a vital problem about ships navigation security and navigation the efficiency in both planning design and navigation operation. Therefore, it has very important realism meaning to improve the flow condition in the entrance of approaching channel.Firstly, the article summarizes some researches on flow conditions in the entrance of approaching channel and improvement measures advanced by domestic and foreign scholars, and discusses the serviceability, as well as the merits and demerits of all kinds of improvement measures. According to characteristic of flow condition in the entrance of approaching channel, this paper infers a theoretic formula pattern about length of circumfluence of the entrance of approaching channel, and applies math model to fit the parameter, Thus determines empirical formula about length of circumfluence of the entrance of approaching channel. Through the tank test, the effect of permeable scope, open porosity and opening mode in partition dikes head on flow conditions in the entrance of approaching channel is researched, hence, we can obtain relative optimal permeable scope, open porosity and opening mode in partition dikes head. The results can be adopted by the design of partition dikes in practical engineering. Meanwhile the two lengths of circumfluence which are obtained on the empirical formula and the laboratory are contrastive analysized. At the same time, the impact of permeable partition dikes on three-dimensional flow structures in the entrance of approaching channel is studied. At last, the paper analysizes the flow conditions in the entrance of approaching channel on opening hole of partition dikes head.