Study on Scouring and Silting Stability of the Seafloor With Crude-Oil Pipelines in the Cezidao-Zhenhai Area

Based on the continuous monitoring of submarine crude-oil pipelines in the Cezidao-Zhenhai area from 2006to 2011and combining with the factors such as hydrology,weather,sediment,topography,geology conditions and exploitative activities,it is proposed that the scouring and silting stability of the seabed with crude-oil pipelines is studied from the perspective of regional ocean integrated environments.The monitoring data indicate that the seabed where crude-oil pipelines are present shows generally a scouring behavior.For example,the pipelines which were buried in 2005became naked at several places in 2008and turned to a suspended state in many segments of the area by 2010and 2011.The constructions of the Jintang Bridge in Zhoushan,the performance of Xinhongkou Reclamation in Ningbo and the extreme weather conditions or short-term catastrophic factors may exert a significant influence on the scouring and silting stability of the seabed in the study area and are also probably the main reasons for the pipeline dangerous status occurring in recent years.