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基于多种较先进的观测仪器,对近期长江河口北槽整治工程实施过程中河道浮泥变化及相关的影响因素进行定点和走航观测。结果表明,近期长江河口北槽浮泥层在潮流速、悬沙浓度、盐度和地形等因素影响下,具有多种准周期性的振荡变化特征,其中小潮形成的浮泥厚度大于大潮形成的浮泥,同时北槽主航槽局部区段浮泥的形成和发展与陆海互相作用的动力结构环境的纵向和横向环流输沙有关。在大、小潮期间的不同环流输沙作用下,局部河段主槽内浮泥的存在,使北槽河道横断面分别出现不同的河槽形态,由于实测浮泥层容重均小于1.25 t/m3,可作为“适航”水深,通常通过即时疏浚清理航槽淤泥基本能保持设计通航水深。
Based on a variety of more advanced observational instruments, the change of channel floating mud and the related influencing factors during the implementation of the North Channel Rehabilitation Project of the Yangtze River estuary recently were observed and observed. The results show that under the influence of tide velocity, suspended sediment concentration, salinity and topography, there are many quasi-periodic oscillation characteristics of the floating mud layer in the north channel of the Yangtze River estuary. The thickness of the floating mud formed by the small tide is larger than that formed by the tidal tide Meanwhile, the formation and development of the floating mud in the partial section of the main channel of the North Trough are related to the longitudinal and horizontal circulation of sand and sediment in the dynamic structural environment of land-sea interaction. Under the action of different circulation and sediment transport during the large and small tide, the presence of floating mud in the main channel of the local river channel resulted in different river channel morphology in the cross section of the North Channel. Since the measured bulk density of the floating mud layer is less than 1.25 t / m3, Can be used as “seaworthy ” water depth, usually through real-time dredging clean silt silt can maintain the design of navigable water depth.