Ice Detection and Avoidance

Abstract

ABSTRACT An extensive risk assessment of oil transportation in Prince William Sound, Alaska was finalized in 1996 that identified drifting icebergs, from Columbia Glacier, as one of the most significant oil spill risks remaining to be addressed. The Prince William Sound Regional Citizens’ Advisory Council (PWS RCAC) was a major participant in this risk analysis. As part of the groundwork for the ice detection project, PWS RCAC has also sponsered extensive studies of Columbia Glacier calving and drift patterns, iceberg size and distribution. A collaborative project, called the ice detection project, was developed by a multi stakeholder working group and provides an opportunity for an immediate and long-term solution using existing technology. One objective of the project is to verify the efficiency, effectiveness and reliability of existing radar technologies to provide mariners and the United States Coast Guard with real time information regarding ice conditions. A secondary objective is to promote the research and development through field testing of new and emerging technologies to determine the possible enhancement of conventional radar. In addition to PWS RCAC, stakeholders responsible for spearheading this project are: Alyeska Pipeline Service Company, Alaska Department of Environmental Conservation, Oil Spill Recovery Institute, United States Coast Guard, Prince William Sound Community College and National Oceanic and Atmospheric Administration. Each of the seven participants brings expertise and backing from the stakeholder they represent. The site chosen for the ice detection radar project is Reef Island (illustration 1), located adjacent to Bligh Reef, Prince William Sound. This location is ideal because of its proximity to Columbia Glacier, the source of the icebergs, as well as providing an unobstructed view of the shipping lanes. A fifty foot tower was installed at the site during the fall of 2001 and a conventional radar system is currently being configured for installation. The expectation is that the system will be up and running by July of 2002, giving real time information on ice in the tanker lanes to mariners in Prince William Sound. A second field test of an UHF radar prototype is planned for the summer of 2002. Field testing and ground truthing of the radar system is scheduled for the next five years.