An HF CODAR Doppler Transponder System

by Randy D. Crissman, Gulf Oil Exploration &, Production Co, Frontier Technology, Dep, Houston, TX, USA,
Michael W. Evans, Gulf Oil Exploration &, Production Co, Frontier Technology, Dep, Houston, TX, USA,



Document Type: Proceeding Paper

Part of: Civil Engineering in the Arctic Offshore

Abstract:

Gulf Oil Exploration and Production Company completed two major phases in the development of a high frequency (HF) CODAR Doppler transponder system for measuring sea ice motion. The system measures positions and instantaneous velocities of transponders deployed on the ice with accuracies of plus or minus 100 ft ( plus or minus 30m) and plus or minus 0. 003 ft/sec ( plus or minus 0. 001 m/sec), respectively, at ranges up to 38 miles (60 km). Each phase involved a field deployment of the system in the Beaufort Sea, Alaska. The 1983 field program assessed the basic concept of using the system to measure ice motion. Based on the encouraging results of the 1983 program, Gulf committed to a major field demonstration of the system in 1984. The 1984 program demonstrated the capability of the system to accurately measure real-time velocities and positions of up to 25 transponders deployed on the ice. Such data is considered to be valuable in developing reliable design, construction, and operation criteria for Arctic offshore structures and systems.

Subject Headings: Ice | Offshore structures | Offshore construction | Doppler systems | Structural reliability | Motion (dynamics) | Gulfs | Beaufort Sea | Alaska | United States | Arctic

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