摘要:
局部冲刷引起裸露甚至悬空是造成管道失稳的主要原因之一。舟山册子岛—宁波镇海海底原油管道自2006年运行以来,其赋存状态由全线掩埋逐渐演变为局部裸露甚至悬空的严峻局面,并且有继续恶化的趋势。基于管道2006—2012年历年检测资料,从多个层面分析造成海底管道冲刷的原因,认为造成管道冲刷的基本条件是研究区的自然冲淤规律,极端天气条件、镇海侧的大型围垦工程、舟山连岛大桥建设、长江来沙减少等其他因素的叠加也不可小视。
Abstract:
For buried submarine pipelines, local scour is one of the main reasons which may lead to pipeline exposure, free span in the seafloor and even failure in use. The submarine oil pipeline from Cezi Island, Zhoushan to Zhenhai, Ningbo, buried in 2005 and operated since 2006, was exposed heavily in several areas and even suspended during 2007—2012. Based on the data of geophysical survey carried out annually, we have good reason to believe that the pipeline’s situation was very bad and would be worse in the future because of the local scouring. The scour was caused mainly by natural process of scouring and siltation. However, other factors, such as extreme weather conditions, large-scale land reclamation, construction of bridges connecting the Zhoushan islands with the mainland, and the decrease in sediment input from the Yangtze River, should not be ignored.
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