甬江扩建油码头对所在河段的行洪影响分析  

Influence of oil wharf expansion on the floodway reach

作　　者：孙东坡[1] 曹兵[1] 王鹏涛[1] 路瑞利[2] 

机构地区：[1]华北水利水电学院,河南郑州450011 [2]宁夏大学土木与水利学院,宁夏银川750000

出　　处：《水利水运工程学报》2008年第3期1-7,共7页Hydro-Science and Engineering

基　　金：“十一五”国家科技支撑计划资助项目(2006BAB06B00-04)

摘　　要：近年来甬江尾闾段修建了不少码头,它们对河口段行洪排涝产生了很大影响.本文采用平面二维水沙数值模拟的方法,以某拟扩建油码头为例,对油码头扩建前、后不同工况条件下该河段的水流及河床冲淤特性进行数值模拟,分析了工程修建后对洪水位、洪水河势及栈桥区冲淤的影响.结果表明,扩建油码头后洪水水力要素发生一定变化,码头上游水位略有壅高,下游水位降落;码头迎流段流速减小,相应背流段流速加大;水流动力轴线略向左岸偏移,但河势依旧稳定;栈桥头部有局部冲刷,码头上下游滩地微量淤积.可以利用落潮流进行航道疏浚清淤与边滩清淤整治,但须防止边滩持续淤积可能带来的河势调整.Lots of piers have been constructed on the tail of the Yongjiang river in recent years, which influences flood flowing through the estuary. Taking an oil pier which will be expanded in this reach as an example, this paper makes use of the 2-dimension water-sediment numerical simulation to simulate flow and erosion-deposition characteristics of the river bed under different conditions before and after construction of the project, and then analyses some impacts of the project on flood level, river regime and the erosion-deposition along the trestle. Results show that after the wharf expansion, there are some changes in every aspect： upstream water level rises, downstream water level gets lower, velocity along the wharf frontage increases and along the back of wharf decreases, and the flow hydrodynamic axis deviates to the left appreciably. There is some erosion at the front of the trestle and slight siltation at the upstream and downstream beach. However, the river regime is still stable. It can be seen that the ebb-tide can be used to scour the river bed and regulate the alternative bar, but the change of the river regime due to the sustaining deposition of the alternative bar should be addressed.

关 键 词：河道行洪 数值模拟 洪潮组合 回流 清淤 甬江 

分 类 号：TV131.4[水利工程—水力学及河流动力学]