Numerical simulation of tidal current field in the reclamation area of Jinzhou Bay, Bohai Sea
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摘要:
金州湾沿岸海洋工程的建设, 将不可避免地对周围海域水动力环境、生态环境等产生影响.通过二维水动力数值模拟, 对金州湾围海造陆区潮流场进行模拟计算, 同时对机场人工岛接岸工程在不同开口情况下对潮流场的影响及侵蚀淤积情况进行预测研究.结果表明: 金州湾潮流特征整体表现为较强的往复性, 海流主流向为偏NE-SW向, 其中偏NE向为涨潮流向, 偏SW向为落潮流向, 潮流最大可能流速在23.2~100.9 cm/s之间.当接陆堤坝在开口50 m、200 m时, 流态变化明显区域主要集中在开口区附近水域, 开口通道及其附近流速明显增加, 而北段接陆堤坝的东侧水域流速呈减小趋势.当开口宽度从50 m拓宽到200 m, 淤积区的平均淤积强度从0.06 m/a增加到0.14 m/a.
Abstract:The construction projects along the coast of Jinzhou Bay will inevitably affect the surrounding marine hydrodynamic environment and ecological environment. The paper simulates and calculates the tidal current field in the reclamation area of Jinzhou Bay by 2D hydrodynamic numerical simulation, and predicts the impact of airport artificial island shore connection project on the tidal current field and erosion siltation under different conditions. The results show that the tidal current is generally characterized by strong reciprocation, and the main flow direction of ocean current is NE-SW, with NE for flood tide and SW for ebb tide. The maximum possible flow velocity is 23.2-100.9 cm/s. When the opening width of land connection dam is 50 m and 200 m, the areas with obvious flow pattern changes are concentrated in the waters near the opening. The flow velocity in the opening channel and vicinity increases significantly, while that in the eastern waters of the northern land connection dam tends to decrease. When the opening width is expanded from 50 m to 200 m, the average siltation intensity in the siltation area increases from 0.06 m/a to 0.14 m/a.
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Key words:
- tidal current /
- numerical simulation /
- hydrodynamic force /
- flow velocity /
- siltation /
- Jinzhou Bay
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表 1 数值模型参数表
Table 1. Parameters of numerical model
参数名称 整体模型 局部模型 网格单元数 431×341 403×407 空间步长/m 47~2577 25~463 时间步长/s 20 15 动边界控制水深/m 0.05 糙率 n=n0+n'/H 涡动扩散系数 $0.1 \Delta x \Delta y \sqrt{\left(\frac{\partial u}{\partial x}\right)^2+\left(\frac{\partial v}{\partial y}\right)^2+\frac{1}{2}\left(\frac{\partial u}{\partial y}+\frac{\partial v}{\partial x}\right)^2}$ 
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表 2 极值潮位模拟偏差统计
Table 2. Simulation deviation statistics of extreme tide level
测站 潮位 实测 计算 偏差 1# 最高/m 1.06 1.06 0.00 最低/m -0.70 -0.72 -0.02 潮差/m 1.76 1.78 0.02 4# 最高/m 1.12 1.07 -0.05 最低/m -0.73 -0.76 -0.03 潮差/m 1.85 1.83 -0.02
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