舟山群岛峡道水动力及沉积特性

摘要

Based on the hydrographic and sediment data in the strait channels of Zhoushan Islands, the characteristics of the hydrodynamics and sedimentation were discussed and the sedimentation effects were primary probed. It was pointed out that the sedimentation effects are the sediments transportation, the sedimentation characters and their varying processes under the action of the strait channel environment. It is different from the fluvial sedimentation under the single direction flow action, from the estuarine sedimentation in the mixing saline and fresh water environment and from the sedimentation in the open coastal environment. The most important character is the clear change of the sedimentary facies in the direction of the vertical of the flow in a short distance and in the strait channel mouth area.%本文根据浙江舟山群岛地区金塘水道、册子水道、虾峙门水道和灌门水道的水文泥沙和沉积资料，以峡道水动力特性为出发点，分析了峡道环境中的水文泥沙特性和沉积特性，初步探讨了沉积峡道效应。文章指出，沉积峡道效应是指在峡道环境中，受峡道水动力特性及其影响下的泥沙运动作用，在峡道中所形成的沉积特点和变化过程。这种变化既不同于受单向水流作用的河流环境，也不同于受盐淡水共同作用的河口环境，也有别于开敞的海岸环境。峡道沉积的重要特点在于，在垂直于水流运动方向的横向上，存在显著的沉积相变。