大连太平湾港区人工湖工程水体交换数值模拟研究

摘要

通过水动力及水体交换数学模型试验,模拟了大连太平湾港区人工湖工程实施后的流场特征及水体交换能力.研究结果表明,湖内水体流动仅靠纳潮,流速整体均较低,大潮平均在0.2m/s以内.湖区内流速分布呈口门附近略高,末端接近静水的趋势.口门拦水潜堤高程越高,湖内流速越低.湖区口门附近交换率较高,末端交换率很低.太平湖不建潜堤条件下,月交换率可达86%左右.如拦水潜堤顶高程抬升,则月水体交换率降低,当潜堤高程为85基面上+1.0 m时,月交换率仅为29%,拦水潜堤的高程决定了水体交换能力的量级.%Based on the numerical modeling of the hydrodynamics and water exchange, the tidal current characteristics and the water exchange ability of the artificial lake at Taiping Bay Harbor,Dalian were studied.The modeling results indicate that the current motion in the lake is depend on the offshore tide,and the current speed in the lake is less than 0.2 m/s even under the condition of spring tide.The current speed and water exchange rate at the lake entrance is larger than that at the end of the lake.Without the construction of the submerged breakwater, the monthly water exchange rate could reach 86%.Once the elevation of the submerged breakwater rises,the water exchange rate decreases.If the elevation of the submerged breakwater is +1.0 m,the monthly water exchange rate could be reduced to 29%.Generally,the water exchange ability of the lake is strongly dependent on the elevation of the submerged breakwater.