秦皇岛市莲花岛工程潮流泥沙数值模拟研究

Numerical simulation research on tide and sediment in Lotus Island project in Qinhuangdao

文章采用波流共同作用下平面二维水沙数学模型,基于三角形网格剖分模式,针对秦皇岛市莲花岛人工岛工程开展潮流及泥沙数值模拟。研究结果表明:莲花岛外形轮廓近似呈椭圆状,长轴走向与岸夹角较小,与水流主流向夹角较小,且围垦面积有限,工程方案实施后未明显改变工程海域大范围主流态,仅人工岛及附近小区域发生一些改变。人工岛方案实施后,流速有增有减,但变化幅度较小,基本控制在0.10 m/s以内;海床冲淤变化影响范围也主要集中在人工岛附近区域,冲淤变化幅度多介于-1.5^+0.9 m,少部分区域冲刷幅度超过1.5 m,其中人工岛迎浪面大部分区域呈海床冲刷状态,人工岛内部水域呈淤积状态。

Based on the two-dimensional tidal current and sediment mathematical model under the co-action ofwave and tide and the triangular mesh subdivision mode, the numerical simulation on the tidal current and sedimentin allusion to artificial island project of Lotus Island in Qinhuangdao was carried out in this paper. Research resultsshow that the contour of Lotus Island is approximately elliptical, and the trend of its long axis has a small includedangle with the shore and the main water flow direction. Moreover, the reclamation area is limited. The constructionof the project scheme has not obviously changed the wide-range main flow state of the engineering sea area. Onlythe artificial island and small regions around have some changes. After the implementation of artificial island project, the flow velocity increases and decreases, but within smaller changes, less than 0.10 m/s. According to changesof seabed erosion and deposition caused by the construction of artificial island project scheme, the influence of theconstruction of this artificial island scheme on the sea area around is mainly manifested in the sea area around theartificial island between-1.5 ~＋0.9 m, which the head sea side of the artificial island is most seabed scour, and theinternal of it is in siltation state.