嘉陵江中游龙爪湾滩航道整治工程方案研究

Scheme of channel regulation engineering at Longzhaowan Beach in middle reaches of the Jialing River

针对嘉陵江中游龙爪湾受沙石开采影响,采沙坑星罗棋布,局部跌水明显,中枯水弯曲半径仅350 m,水流困弯严重,目前航道尺度达不到渠化后航道等级要求的问题,进行了典型弯道型急流滩险碍航特性、整治参数和整治方案研究,采用现场调查、水文统计、经验公式和数值模拟等方法,得出改善龙爪湾滩通航条件并达到渠化后航道等级的较优整治方案。结果表明,对该类滩险采取筑坝与疏浚相结合的方法,可以调整河床形态、控制疏浚河底,起到增加航道水深、改善通航流态、保障通航安全的整治效果。

Aiming at the problems that Longzhaowan,in the middle reaches of the Jialing River,is affected by the sand mining,the sand pits are all over the place,the local water drop is obvious,the radius of the middle-low water is only 350 m,the water flow is trapped and bent seriously,and the current channel scale cannot meet the requirements of the channel grade after canalization,we study the navigation characteristics,regulation parameters and regulation scheme of typical bend rapids,use the methods of field investigation,hydrologic statistics,empirical formula and numerical simulation,obtain a better regulation scheme to improve the navigation conditions of Longzhaowan Beach and reach the channel grade after channelization.The results show that the combination of damming and dredging for this kind of shoal hazards can adjust the riverbed shape and control the river bottom dredging,also achieve the regulation effect of increasing the water depth of the channel,improving the navigation flow pattern,and ensuring navigation safety.