Abstract: Jialing River Bazinao group shoal section is located in the tail of Fengyi navigation power junction reservoir. Due to the separation of the water discharge outlet of Mahui power station and vessel lock exit, the right branch of Bazinaotan is of narrow channel of shallow water and the left branch is extremely curved and narrow, which can not accommodate navigation. Further in Dashi shoal section the sand-pebble bar in water splits Jialing river into two branches right and left of which the left branch is relatively straight but is of insufficient water depth in dry season while the right branch is of smaller curve radius and does not meet requirement for high class channel construction. Aiming at these navigation impeding characteristic problems of Bazinaotan shoal group reach of Jialing river, a mathematical model was set up to calculate, analyze and compare the two different treatment schemes for current and sediment conditions. The results show that this mathematical model can well simulate reach flow and sediment accumulation situation. As to the end result of regulation and rectification, scheme one is superior for such advantages of less siltation, more stable channel and thus can be taken as implementation scheme for reference of design.

Key words: waterway engineering, mathematical model;sediment deposition, shoal group, navigation condition

摘要： 嘉陵江八字脑滩群位于凤仪航电枢纽库尾，由于马回电站发电泄水口与船闸出口分散布置，导致八字脑滩段右汊槽窄水浅，左汊又极其弯曲和狭窄，不具备通航条件；同时，大石塘滩段的沙卵石江心洲将嘉陵江水分为左右两汊，左汊较顺直，但枯期水深不足，右汊弯曲半径较小，不能满足高等级航道建设标准。针对嘉陵江八字脑滩群河段的碍航特征，应用数学模型对两种不同的整治方案进行水流条件以及泥沙淤积情况计算分析与比较。研究结果表明：该数学模型可较好地模拟河段水流的运动及泥沙的淤积情况；从整治效果看，方案一相对较优，泥沙回淤量较少，航槽相对稳定，可作为该滩整治方案，供设计参考。

关键词: 航道工程, 数学模型, 泥沙淤积, 滩群, 通航条件