大连长兴岛北港区自然条件分析与泥沙淤积计算

Analysis on natural condition and seabed morphological processes characteristics in north harbor of Dalian Changxing-island

文章对大连长兴岛北港区的自然条件进行了分析,并运用TK-2D软件建立了考虑波浪影响的平面二维潮流泥沙数学模型,对工程造成的流场变化和港区泥沙淤积进行了数值模拟计算。结果表明,总体规划方案实施后,码头泊位区流速减小,东西防波堤之间的内港池流速明显减小;内港池内涨潮存在环流现象。各部位泥沙年淤积强度在0.25 m以内;全港淤积量80万m3/a,全港平均淤强0.10 m/a,没有泥沙骤淤问题。经过比较,从潮流泥沙角度考虑,对比各规划方案以方案2为最佳。

In this paper,the natural conditions in north harbor of Changxing-island were analyzed.A 2-D current and sediment numerical model with consideration of wave influences was established by using of TK-2D software,and the current field and sediment movement were numerically simulated by this model.The results show that the flow velocity of berth decreases,and the flow velocity of inner harbor basin between east and west breakwater also decreases evidently after the implementation of general scheme.The circular flow occurs in harbor area.The siltation intensity is less than 0.25 m each year,and the siltation volume is about 800 000 m3/a.The average deposition thickness is 0.10 m/a,and sudden siltation will not occur in this harbor.According to the comparison,case 2 is the best plan.