Sea Technology

FEB 2017

The industry's recognized authority for design, engineering and application of equipment and services in the global ocean community

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26 st / February 2017 cation systems with integrated measuring platforms. The counterfill work reduced the risk of future wreck and sedi- ment movement, including materials contaminated with mercury. This enables the responsible Norwegian authorities to evaluate and prepare the next steps toward final elimina- tion of contamination risk in the environment. ST Data from the surface buoy was relayed via Iridium satel- lite communication to servers, with one system located at the NIVA office in Oslo and the other one on board the offshore support vessel. Measurement data violating the threshold limits caused the transmission of SMS messages to key personnel. In ad- dition, a visible and audible alert was provided, triggering additional water sampling at the location of the threshold violation and later analysis of the mercury load of the col- lected samples. Data were visualized and made accessible via a Web por- tal hosted on the server at NIVA in Oslo. Results At the end of June 2016 the project was successfully and safely completed ahead of schedule. The monitoring sys- tem reliably provided data throughout the entire counter- fill installation. Monitoring and data analysis showed that mercury-contaminated sediment did not spread during the work done to stabilize the wreck. With this project, develogic has set new standards for large-scale and highly complex underwater communi- Markus Motz is the managing director and lead de- sign engineer of develogic, located in Hamburg, Ger- many. Motz graduated with a degree in aerospace engineering at the University of Stuttgart. Since 2000, develogic focuses on the development of turnkey sys- tems, enabling subsea data collection and real-time data transmission to customers. Thomas Radtke is the lead software engineer at de- velogic. He graduated with a degree in computer sci- ence and engineering from the Hamburg University of Technology. Since he joined develogic in 2008, he has contributed to numerous projects for customers in marine science and the offshore industry. "The challenge of this project was to design a robust multinode subsea communi- cation network around the operation area that takes minimal installation effort."

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