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Internal Waves in Straits (IWISE): Observations of Wave Generation
RHODE ISLAND UNIV NARRAGANSETT GRADUATE SCHOOL OF OCEANOGRAPHY
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The long term goals are to use observations and analysis of stratified flow past complex topography to understand how internal tidal interaction in straits is responsible for the generation of large amplitude high frequency internal waves. Our objectives are to build and deploy a 2-D array of pressure-sensor-equipped inverted echo sounders PIESs so as to observe the generation of internal waves by tidal interaction with topography in Luzon Strait, and to interpret the results using appropriate models of internal wave formation and evolution. Our approach requires construction of an array of PIESs see Li et al. 2009. Our plan called for eight instruments, but the size of the planned array has now been increased as a result of a separate ONRDURIP, motivating redesign of the array based on model calculations at different sections across the ridges. The plans call for a preliminary deployment of a small array, followed by a primary deployment of a full scale array. Model analyses of the generation region using the MITgcm have been carried out, with the goal of exploring the role of the Kuroshio in modifying the internal tide generation and resultant formation of nonlinear internal waves. Together with modeling and data analysis activities completed by former student Li Qiang under the NLIWI project see Li et al., 2011 and Farmer et al., 2011, these results provided guidance for the array deployment. Instrument construction was carried out by the URI Equipment Development Lab.
APPROVED FOR PUBLIC RELEASE