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对多年来黄河三角洲的调查资料分析表明 ,三角洲的不稳定性比较突出 ,对海洋工程设施危害极大 ,主要表现在以下几个方面 :1工程软弱层是三角洲不稳定的根本因素 ,是形成海底刺穿、大型海底滑坡等灾害体的基础 ,尤其是极端条件下触发软弱层流动 ,所产生的大型海底滑坡带来的灾害是巨大的 ;2水下斜坡是三角洲上主要的工程不稳定区 ;3海底冲刷和年内的动力调整在海底形成的活动层对海底铺设的管线和海岸大坝构成危害 ;4应高度重视三角洲下沉产生的工程危害 ,造成三角洲整体下沉的主要因素是构造、均衡、压实下沉和海平面上升 ,这些因素耦合下沉量比较大 ,估计未来 10 a将下沉 80 cm,大大降低了已有工程设施的设计标准 ,同时 ,将陆地测量基准系统破坏。
Analysis of the survey data of the Yellow River Delta over the years shows that the instability of the delta is quite prominent and is extremely detrimental to the marine engineering facilities. The main results are as follows: 1 The weak layer in the project is the fundamental factor of instability in the delta and is the result of the formation of the seafloor Piercing, large undersea landslides and other disasters, especially in the extreme conditions trigger the flow of the weak layer, resulting in large-scale landslides caused by the disaster is enormous; 2 underwater slope is the major unstable area in the delta; 3 Submarine scouring and year-on-year dynamic adjustment The active layer formed on the seabed constitutes a hazard to the seabed laid-off pipelines and coastal dams; 4 It is important to attach great importance to the engineering hazards caused by the subsidence of the delta. The main factor contributing to the overall subsidence of the delta is its structure and equilibrium , Compaction and sea level rise. The coupling and sinking of these factors is relatively large. It is estimated that the subsidence will be 80 cm in the next 10 years, greatly reducing the design standards of existing engineering facilities and destroying the baseline measurement system of land.