南京三汊河口人行桥修建对上游河口闸泄流的影响

针对南京三汊河口人行桥修建对上游河口闸泄流的影响,应用河工模型进行了研究。根据2014年1月实测的地形资料,建立了水平比尺100、垂直比尺50的三汊河口河工模型。试验数据在与数值计算数据对比的基础上,研究了人行桥建设前后闸下水位、流速等水力要素的变化情况。结果表明,人行桥修建后桥墩上游水位有所升高,流速有所降低,河道主流线向左略有偏移,但影响较小,不会产生河口闸泄流、行洪的安全问题。

Impact from construction of footbridge at three tributaries confluence estuary in Nanjing on discharge flow from upstream estuary sluice

For the impact from the construction of the footbridge at three tributaries confluence estuary in Nanjing on the discharge flow from its upstream estuary sluice，a study is made with a river model. In accordance with the topographical data measured in January，2014，a river model for the three tributaries confluence estuary with the horizontal scale of 100 and the vertical scale of 50 is established. Based on the comparison between the test data and the data from the relevant numerical calculation，the variations of the hydraulic factors of water level，flow rate，etc. of the sluice before and after the construction of the footbridge are studied. The results show that the upstream water levels of the bridge piers rise in some extent with lowered flow rates，while the main stream of the river is a bit shifted to the left with only less impact，from which no any safety problems of the discharge flow and flood discharge from the estuary sluice are there to be brought out.