Assessing Jetty Effectiveness via Statistical Analysis of AIS Data
ERDC Vicksburg United States
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PURPOSE This Coastal and Hydraulics Engineering Technical Note CHETN describes a pilot study exploring the use of statistical analysis of Automatic Identification System AIS data to assess the sheltering effectiveness of jetties. BACKGROUND Coastal navigation structures are frequently provided to improve the controllability of navigating vessels. Structures are typically designed to withstand exposure to wave loads that far exceed safe vessel operating conditions. Even damaged structures may continue to shelter vessels during normal vessel operating conditions. A structure functionality measure provides a mechanism to prioritize structures for maintenance and rehabilitation whereby damaged structures that continue to demonstrate higher functionality receive lower priority. Globally, certain commercial vessels are required to broadcast specified information using AIS transceivers. The transmitted data are collected by monitoring stations across the United States and archived by the U.S. Coast Guard USCG. Detailed discussion of AIS purpose, carriage requirements, data content, and availability is provided by Scully and Mitchell 2015. USACE staff may obtain archival AIS data from the USCG USCG 2016 or from the developing AIS Analysis Package AISAP website Scully and Mitchell 2015. AIS technology documents vessel behavior in high resolution and can be used to quantify vessel-structure interaction. A procedure using AIS data parameters listed in Table 1 was developed to enable statistical comparison of AIS-derived vessel performance metrics for vessels sheltered by jetties compared to those exposed to open ocean conditions.
- Marine Engineering