佛山市中心组团桥梁群对河道影响的数值分析

在不同频率流量和阻水程度条件下,采用一维明渠非恒定流网河数学模型,分析规划中的佛山市桥梁群对区间河道洪季行洪、枯季水环境的影响,计算洪季不同频率洪峰流量下规划桥梁群对区间河道行洪洪水位、分流比的影响,枯季时规划桥梁群对区间河道过流量、分流比的影响,结果表明,利用一维网河数学模型计算佛山市中心组团规划桥梁群对区间河道断面平均水位、流量和流速的影响,结果有足够的数值精度,是可信的。

Numerical analysis of influences of bridge group to be constructed in Foshan City on river courses

The one-dimensional river network mathematic model for unsteady flow in open channels was adopted to analyze the influences of bridge group still in planning stage on flood discharge through river courses in flood season and water environment of river courses in dry season under the flow rate of different flood frequencies and different water blocking conditions.The influence of the bridges on the flood level and diversion ratio of river courses in flood season under peak runoff of different flood frequencies,and the influence on the flow rate and diversion ratio of river courses in dry season were calculated.The result shows that the mathematic model is accurate and reliable for calculation of the influences of bridges to be constructed on average water level,flow rate,and flow velocity of different river sections.