顺河跨海大桥工程对河道影响数值分析

为了研究顺河跨海大桥工程对河道产生的不利影响,建立了包含桥梁工程在内的平面二维水动力数值模型,采用实测潮位资料验证了模型的合理性,并进一步分析了工程对河道壅水、流态以及河床冲刷的影响。研究表明:跨海大桥工程的建立会导致河道水位有微弱的升高,最大壅高仅为6cm;桥位附近流态变化较大,在桥墩处会形成许多小涡旋,在人工岛与桥墩的共同作用下会形成一个局部大涡旋,这些影响导致了河床的局部冲刷,河床的最大冲刷深度为0.83m。

Numerical analysis on the influence of sea-crossing bridge engineering on river courses

Given that the construction of sea-crossing bridges may have adverse effects on rivers, a plane two-dimensional hydrodynamic numerical model was established. The model was tested and proven to be valid with the measured data of tide water, and was used to analyze the effects of the engineering on the rise of water level, the changes of flow regime, as well as the depth of riverbed scour. The study indicated that the sea-crossing bridge engineering will cause a slight rise in the backwater height of the rivers. The maximum backwater height is only 6 cm. But the flow regime will vary greatly as numerous vortices will emerge at the vicinity of the bridge location. These influences will result in local scour of the riverbed, and the maximum scour depth is 0.83 m.