深圳机场跑道工程水域潮流泥沙数值模拟研究

Numerical Simulation of Tidal Current and Sediment in Waters around Shenzhen Airport Runway Expansion Project

为定量评估深圳机场第三跑道扩建工程建设方案对附近水域和地形的影响范围和影响程度,基于数值水流模型和泥沙输运模型对珠江口开展整体建模,并对工程局部进行精细分析计算。结果表明:水动力影响范围限于工程上、下游和西侧2 km范围。工程西侧水域流速有所增加,工程南、北两侧水域流速有所减小;工程方案实施后沿江高速沿程水域的水体含沙量会略有减小,因此工程外海堤西侧呈冲刷趋势,局部最大冲深0.63 m,平均冲刷0.15 m;除此以外,工程周边水体含沙量的变化幅度较小,工程区海域含沙量仍在0.05 kg/m3左右。

In order to quantitatively evaluate the range and degree of influence on nearby waters and terrain by the construction plan of Shenzhen airport 3rd runway expansion project,overall modeling for Pearl River estuary is based on numerical flow model and sediment transport model,and elaborate analysis and calculation are carried out for part of the project.The analysis results show that hydrodynamic influence prevails in the range of 2 km in the upper and lower reaches as well as west side of the project.The flow velocity increases in the water area west to the project,and decreases in the water area south and north to the project.With the execution of construction plan,the sediment content of the water area along Riverside Expressway will decrease slightly,with scouring trend shown on the west side of offshore embankment that shields the project,including the maximum scouring depth of 0.63 m and an average depth of 0.15 m.The sediment content of nearby water body has smaller variation range,that is,the sediment content of the project waters is still approx.0.05 kg/m3.