佛面滩炸礁优化方案的数值模拟
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摘要
涪陵—丰都河段内的佛面滩碍航礁石伸出江心,汛期产生强烈的横流,流态紊乱,船舶须过河上行,与下行航路交叉,威胁船舶航行安全。针对上述问题,拟通过炸除佛面滩部分礁石改善通航流态,实现船舶"各自靠右,分边航行"。建立佛面滩河段二维水流数学模型,通过模拟多级流量的流场,确定航行条件最差的最汹流量为2. 45万m~3/s;模拟计算最汹流量下8个炸深方案流场,通过比较各个炸深方案的流速、横向流速、流速横纵比、航行推阻比、单位炸深效比和流态,认为8 m炸深方案最优。
The Fomian beach,which is a reef extending the heart of the river between Fuling and Fengdu reach of the Yangtze River,causes strong cross flow and flow disorder in the flood season,so the ship must go upstream by crossing the river and conflict with the downstream route,resulting in endangering the safety of the ship's navigation.By blasting partial reef of Fomian beach,we can improve the navigation flow condition and realize the ships "Keeping at the right and sailing side by side".By establishing two-dimensional flow mathematical model of the Fomian beach to simulate the flow field of the multi-stage flow,we determine that the most turbulent flow is 24 500 m3/s. By simulating eight reef blasting schemes of different explosive depths under the most turbulent flow and comparing the flow velocity,transverse velocity, ratio of transverse and longitudinal velocity, ratio of propulsive and drag force, effect ratio of unit depth of each reef scheme and flow regime,we know that the optimal reef blasting scheme of 8. 0 m explosive depth is the best.
The Fomian beach,which is a reef extending the heart of the river between Fuling and Fengdu reach of the Yangtze River,causes strong cross flow and flow disorder in the flood season,so the ship must go upstream by crossing the river and conflict with the downstream route,resulting in endangering the safety of the ship's navigation.By blasting partial reef of Fomian beach,we can improve the navigation flow condition and realize the ships "Keeping at the right and sailing side by side".By establishing two-dimensional flow mathematical model of the Fomian beach to simulate the flow field of the multi-stage flow,we determine that the most turbulent flow is 24 500 m3/s. By simulating eight reef blasting schemes of different explosive depths under the most turbulent flow and comparing the flow velocity,transverse velocity, ratio of transverse and longitudinal velocity, ratio of propulsive and drag force, effect ratio of unit depth of each reef scheme and flow regime,we know that the optimal reef blasting scheme of 8. 0 m explosive depth is the best.
引文
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[3]冯小香,李建兵,樊建超.三峡两坝间水田角河段航道整治三维水流数学模型应用研究[J].水道港口,2010,31(6):577-582.
[4]张明进,伍文俊.浅谈数值模拟技术在长江中下游航道整治中的应用[J].水道港口,2010,31(2):102-107.
[5]刘东.长江口航道整治参数研究[D].杭州:浙江大学,2016.
[6]熊伟.非结构网格下的三维潮流泥沙数值模拟[D].大连:大连理工大学,2012.