Abstract: | The Lujiahe Shoal is one of the important shoals in the middle reaches of the Yangtze River.Firstly,based on the analysis for some properties of nature in this waterway,it is pointed out that the key of the problem in the channel is to be used the flood navigation and the low water navigation in turn in year.And then,the basic evolution laws and their reasons are summarized.Finally,some factors to influence the changes of the navigation conditions,such as the relations among the positions for the navigation,the mainflow,and the thalweg in the channel each other,the relations between the navigation condition and water level,and the relations between the navigation condition and flood characteristic etc.,are discussed. |