Design of Moorings for Complex Fish Passage Project

摘要

Westmar Consultants designed a mooring system for a large floating fish passage facility subject to 18.5 m water level fluctuations in the forebay of a deep-water reservoir in northwest Washington State, using OrcaFlex software developed for offshore oil rigs. The design included extensive numerical modeling to accommodate the large water level fluctuations and high wind and current loads on the floating structures and nets. This system replaced the original, which was installed during dam construction in 1959. The paper will describe this environmental project that uses state-of-the-art mooring design technology to enable salmon migration past dams and other river obstructions that do not otherwise allow for fish passage.