汕头港外拦门沙整治技术和功效

Regulation techniques for the sandbar outside Shantou Harbour

汕头港外拦门沙是制约该港进一步发展的主要障碍。在对工程海域环境泥沙论证基础上 ,进一步对工程泥沙问题进行论证和预报 ,如拦门沙整治后的演变趋势 ,开挖航道的回淤和整治工程的导流拦沙功效等。工程实施期间及完工后进行多年的现场跟踪观测表明 ,各项工程泥沙问题的预报均获得良好的印证。本文还介绍了外拦门沙整治技术方面的经验 ,包括运用单导堤改变工程海域水沙营运动力格局和泥沙输移方向 ,导堤的长度和高度 ,沿堤流和顶冲流的整治 ,航道开挖最佳深度和宽长以及维持航道平直稳定的技术等。

WT5”BZ]The expansion of the sandbar outside Shantou Harbour not only affects the navigability of the channel, but also obstructs the further expansion of the harbour. Based on the sediment conditions of the surrounding sea area, the sediment problems are studied, including those concerning the expansion of the sandbar in the outer navigation channel, the silting amount and the efficiency of training measures. Field observations show that the sediment forecasting by the authors is quite ideal. In this paper, described are the authors experiences in the sandbar regulation, including the use of a single training dike to change the direction of current and sediment, the altitude and length of the dike, the regulation of the current along and against the dike, the optimum dredged depth and the way how to maintain the smooth going and stability of the navigation channel.