Feasibility Study on Real-time Seafloor Glove Monitoring Cable-network

A0130 Kenichi Asakawa Deep Sea Research Department, Japan Marine Science and Technology Center

A0131 Katsuyoshi Kawaguchi Deep Sea Research Department, Japan Marine Science and Technology Center

The real-time, long-term earth observation is essential to know the

glove dynamics. However, the shortage of geo-scientific data beneath

the sea makes it difficult to comprehend the nature phenomenon. It is

very important to consecutively obtain scientific data from underwater

in vast research field such as seismology, geo dynamics, marine

environmentology, ecology and biology.

A seafloor observation system based on the telecommunication submarine

cable technology, is the most reliable way to secure the hi-capacity

data transmission and power feeding line between the land and seafloor.

The current submarine cable in-line seismic observation system

presented us the talent of forthcoming seafloor observation.

In this paper, the authors will propose a scientific cable network of

next generation having the following feature. They are, 1) mesh-like

cable configuration covering research area, 2) more than 3,000km total

cable length, 3) deployable up to 6,000m water depth, 4) 50km

observation cite interval, 5)exchangeability of measurement equipment,

6)system extensibility.

The proposed cable network structure will be quite different from the

conventional telecommunication submarine cable system. Plural

measurement equipment will be placed in each observation cite, and

these sensors will be able to be replaced for maintenance and upgrade.

The power feeding system and the data transmission system will be more

sophisticated than those for the telecommunication cable system. This

paper will discuss some possible system structure such as system

architecture, reliability, construction / maintenance method,

communication protocol, data format and time synchronization.