Specifications for submarine cable and pipeline route investigation.

Abstract

The purpose of construction of submarine scientific observation network in the East China Sea from the seabed to the sea surface, is to deeply understand the material exchange process and mechanism between the Yangtze River estuary and the East China Sea under the influence of human activities and its eco-environmental effects, and study the formation mechanism, biogeochemical process and its impact on the ecological environment of the hypoxia zone in the East China Sea. From May to August, 2018, submarine cable route survey for this project was carried out in the East China Sea. The survey vessel used is the M.V.Heke 2. Survey contents include Bathymetric and topographic survey, seabed conditions, shallow geology, soil physical and mechanical properties, corrosive environmental parameters, marine hydrographic and meteorological elements and so on. Equipment and sensors, such as side scan sonar, sub-bottom profiler, magnetometer, sampler and CPT were employed in this survey. This survey finished 6500km geophysical survey lines, 103 stations of seabed sampling, 55 stations of in-situ test, 48 stations of marine hydrographic observation within 95 days. This work was completed under the guidance of the national standards of the People's Republic of China (GB/T 17502-2009) "Specifications for submarine cable and pipeline route investigation ".