论文部分内容阅读
本文着重阐述了与连云港深水外航道建设有关的三个问题。(1) 分析了外航道沿线的自然条件,勘测和工程实践表明,外航道所在土层对于航道开挖和边坡维护来说是比较好的土层;航道回淤受制于由岸向海含沙量和输沙强度的变化,其中对航道回淤影响最大的是位于海峡东口门附近南北向往复流带内的含沙量相对高值区。(2) 从潮汐水流中粘性细颗粒泥沙的冲淤特征出发,考虑影响回淤的主要因素包括水力条件、供沙条件、泥沙特性、挖槽深度及地形条件,初步建立了冲淤计算方法并用实测资料作了验证。(3) 通过对历史上抛泥情况及对回淤影响的分析,对今后外航道的开挖和维护挖泥土方的处理提出了合理的抛泥方案的建议。
This article focuses on three issues related to the construction of the deep-water outer lanes in Lianyungang. (1) The natural conditions along the outer channel are analyzed. Investigation and engineering practice show that the soil layer of the outer channel is a better soil for channel excavation and slope maintenance. Sediment volume and sand transport intensity changes, of which siltation is the most affected channel is located in the north-south intertidal zone near the mouth of the strait within the relatively high sediment concentration. (2) Based on the scouring and silting characteristics of cohesive fine sediment in tidal flow, the main factors affecting back silting, including hydraulic conditions, sand supply conditions, sediment characteristics, trenching depth and topography, were initially established. Methods and verified with the measured data. (3) Based on the analysis of the history of throwing mud and the influence of back silting, suggestions for reasonable throwing plan for the excavation of the outer waterway and maintenance of the dredging earthwork are put forward.