Research on deformation of submarine slope in Zhoushan Islands by in-situ observation

Instability of submarine slopes in Zhoushan Islands is widespread. Frequent landslides pose a great threat to offshore facilities such as optical cables, reclamation projects, ports and docks. In this paper, self-developed in-situ observation system used observe the deformation on southwest side Zhujiajian Island for 75 days. The results show that characteristics sediments at different depths slope are different, lateral bottom about 0.75 mm, which three times much overlying sediments. process presents step-like change, direction consistent with trend slope.