长江九江河段河势演变及治理探讨

对九江河段历史的和近期的演变分析表明,该河段由于受来水来沙及上游河势变化的影响,深泓有一定的摆动幅度,由此引起潜洲、边滩、浅滩出现相应的冲淤变化,以致影响船舶停靠和通航.对该河段进行治理,一方面可通过挖泥疏浚来缓解目前的矛盾;另一方面,从长运考虑应实施综合治理工程来彻底根治目前九江河段存在的问题.

A Discussion on Evolution and Regulation of the Harbor District Lane of Jiujiang Reach of the Yangtze River

The analysis of historical and late evolufion of Jiujiang Reach indicated:with the influence of flow-sediment and the variation of upper river course,thethalweg has some swaying range and causes the scour and deposit variation ofhidden sandbar,sidebeach and shallows correspondingly,thus affects shippinganchor and navigation.The basical evolution law of hidden sandbar goes this way:when the flowgoes out of Renminzhou Sandbar and its thalweg leans rightward,the hiddensandbar disappears;but if its thal-weg is in the center or a bit rightward,thehidden sandbar then comes into view.The mouth shallows of north branch of Zhangjiazhou Sandbar deposits in floodseason and scours in dry season,thus basically maintains the equilibrium betweenscour and deposit within the year;the deposit is mainly caused by the downwardscoured sediment of the lower sidebeach of the Jiujiaug convex-bank.The variation of the lower shallow district of south branch is related to its channelshape,flow and the mutual influence between the River and the Poyang Lake.The regulation measure of Jiujiang Reach,on the one hand,can be reachedby means of dredge to relieve the present contradiction;on the other hand,synthetical regulation project must be applied to cure Jiujiang Reach of itsexisting problems radically.