Flow characteristics of Wuqiao reach and evolution rules of Hanyang side bar
He Juan · Engineering Journal of Wuhan University · 2008
The main problem in Wuqiao reach is the navigation-obstruction of Hanyang side bar.In order to make clear the navigation obstruction mechanism of Hanyang side bar,flow characteristics and channel evolution characteristics has been analyzed based on approaches of model experiment and analysis of prototype observation data.The analysis indicates that the water block produced by channel constriction and bridge pier hinder,the backwater produced by Hanjiang River afflux,the sucking effect of Wuchang deep pool and the decline of right branch induces the formation of Hanyang side bar and the mainstream oblique flow from Qianzhou tail to Wuchang deep pool.In flood season,the flow dynamic axis between Wuhan Yangtze Bridge and Qianzhou is straight and near the left,while in the dry season,the axis is bend and transit from left to the right at the Qianzhou tail.The change of the flow dynamic axis brings to the intro-year variation of Hanyang side bar which presents as scours in flood period and deposits in falling stage and dry period.And the navigation obstruction degree of Hanyang side bar depends on the different flow conditions during dry period.