淤泥质海岸大尺度进港航道回淤特性数值研究

Numerical Modeling of the Silting Feature of Large Approach Channel for Muddy Coast

以连云港海区为例,应用经过验证的波浪、潮流共同作用下二维悬沙运动数学模型,模拟淤泥质海岸进港航道的回淤情况,并在此基础上进一步对大尺度深水进港航道的回淤特性进行详细探讨。研究结果表明,连云港外海进港航道回淤强度沿航道里程主要呈先增后减的趋势,其中航道宽度和航槽挖深均对断面平均回淤强度及其分布形式存在影响;同时研究也表明,航道的南侧回淤强度大于北侧,横断面回淤强度多呈两边高、中间低的"U"形分布形式,并且随着航道里程的增加,回淤强度在横断面方向逐渐变得均匀。

Considering the effects of both tidal current and wave, a two dimensional numerical model is used to simulate the mud transportation in Lianyungang harbor, and verification is made using field data. Based on this model, the silting feature of large approach channels is studied. The results reveal that the cross-section averaged silting intensity increases at the beginning, and then decreases along the channel in Lianyungang harbor, and it is sensitive to the variations of channel depth and channel width. The results also show that the silting intensity along the cross-section of the channel presents a feature of a ＂ U＂ shape, and is larger at the southern side. As the channel extending to the offshore, silting intensity becomes uniform along the cross-section.