威海靖海湾港区张家埠新港建设对泥沙冲淤影响预测分析

摘要

运用ECOMSED(水动力泥沙)三维模型模拟潮流、波浪(施加风)作用条件下威海靖海湾港区张家埠新港建设前后周围海域海底地形的演化,分析其冲淤变化.并利用冲淤平衡时波潮流共同作用下对海底的切应力与沉积物临界起动剪切力相等的原理,对新港建设后的极限冲刷深度进行预测.结果表明,在引堤透空段附近和防波堤端头冲刷较严重,50年一遇和25年一遇波浪作用下最大冲刷深度可达3.5 m和2.9 m.此结果将为新港冲刷防护工程设计提供科学依据.%In this paper, three-dimensional model ECOMSED was used to simulate the evolution of the seabed terrain under the condition of tide and wave (imposed by the wind), and to analyze the variation of scouring and depositing after the completion of Zhangjiabu new port construction at Jinghai bay at Weihai. The shear stress that imposed by the joint action of wave and current to the seabed, is equal with the critical stress of incipient motion of sediment, so that the variation of scouring and depositing can be analyzed. It was shown that the seabed was eroded badly near the open section of the approach embankment and the terminal of the breakwaters, where the maximum values of scouring depth for 50 and 25 years return period are up to 3.5 m and 2.9 m, respectively. This conclusion may provide reference data to protect against scouring.