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河口水下底坡不稳定性是指可导致海上工程设施环境灾变乃至重大灾害发生于河口海区底坡上的地质现象.近年来,我们在黄河口海区的多次调查表明,该海区水下底坡上存在着大量的不稳定现象,具体表现为沉积物的塌陷、滑塌、滑坡和冲沟等,如图1所示,其影响深度达几米,水平尺度则可达几百米至几公里.这些水下底坡上的不稳定现象严重地威胁着该海区的工程设施的安全,曾多次使该海区的石油平台的作业造成巨大损失. 黄河平均每年向河口海区输送10.6亿t泥沙,形成了海口区因高速沉积作用而欠固结的
The unstable instability of the underwater mouth of the estuary refers to the geological phenomena that can lead to the environmental disaster of the offshore engineering facilities and even to major disasters that occur on the bottom of the estuary sea area. In recent years, our many surveys in the estuary of the Yellow River Estuary show that the underwater bottom There are a large number of instability on the slope, which is manifested as sediment collapse, landslide, landslide and gully, as shown in Figure 1, which affect the depth of a few meters, horizontal scale up to a few hundred meters to several kilometers The instability on these underwater slopes is a serious threat to the safety of the engineering facilities in the sea area and has caused huge losses to the oil platforms in the sea area on many occasions. The Yellow River, on average, delivers 1.06 billion tons of sediment to the estuarine and marine areas each year , Forming the Haikou area due to the high-speed sedimentation and consolidation