潮流界建闸潮波变形及冲淤变化研究
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摘要
采用二维水动力数学模型和河相关系,研究瓯江青田水利枢纽建闸后闸下河段潮波变形和河床冲淤变化。研究结果表明,由于青田水利枢纽位于潮流界末端,截断闸址上游的纳潮量大小有限,因此对闸下河段潮波变形如高低潮位、涨落潮历时,涨落潮量影响幅度均较小,且影响幅度自闸而下逐渐减小。建闸引起闸下河道淤积261万方,平均淤积厚度7 cm,其中闸址下游5 km的范围内淤积厚度12 cm,淤积幅度较小,影响可通过汛期合理调度开闸放水进行减缓。
2-D hydrodynamic-numerical model and hydraulic geometry are applied to study tidal wave deformation and siltation variation downstream sluice in Qingtian Dam in main stream of Oujiang. The result shows that,because Qingtian Dam is located on the tidal flow limit,the tidal prism upstream the dam is truncated limitedly,the influence on tidal wave deformation such as high and low water level,flood and ebb duration,fluctuation tidal prism is affected limitely,and it is attenuated with distances. The siltation amount is 2610000 m~3,the average siltation thickness is 7 cm and the silt thickness in range of 5 km distances is 12 cm. As a whole,the influence of siltation is limited,it can be slowed down through reasonable flood discharge scheduling in flood season.
2-D hydrodynamic-numerical model and hydraulic geometry are applied to study tidal wave deformation and siltation variation downstream sluice in Qingtian Dam in main stream of Oujiang. The result shows that,because Qingtian Dam is located on the tidal flow limit,the tidal prism upstream the dam is truncated limitedly,the influence on tidal wave deformation such as high and low water level,flood and ebb duration,fluctuation tidal prism is affected limitely,and it is attenuated with distances. The siltation amount is 2610000 m~3,the average siltation thickness is 7 cm and the silt thickness in range of 5 km distances is 12 cm. As a whole,the influence of siltation is limited,it can be slowed down through reasonable flood discharge scheduling in flood season.
引文
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[4]刘杰,程海峰,赵德招.长江口12. 5m深水航道回淤特征[J].水科学进展,2014,25(3):358-365.
[5]曲红玲,窦希萍,赵晓冬,等.不同类型建闸河口闸下淤积模拟计算[J].海洋工程,2011,29(2):59-67.
[6]匡翠萍,梁慧迪,李建,等.建闸河口整治工程与河床演变特征[J].同济大学学报(自然科学版),2017,45(5):782-790.
[7]王震,周立炎,马洪亮,等.甬江建闸后闸下淤积数值分析[J].科学技术与工程,2015,15(19):188-191.
[8]王向明,张新周,窦希萍,等.建闸河口闸下潮波变形数值模拟研究[J].水运工程,2012,460(9):18-23.
[9]耿兆铨.二维非恒定流动的有限元计算模式[J].华东水利学院学报,1981(4):94-106.
[10]韩曾萃,唐子文,曹颖,等.浙江省几条河口的动力与水力几何形态关系的研究[J].泥沙研究,2014,12(6):44-50.
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