Internal Waves in Straits (IWISE): Observations of Wave Generation
Abstract
The long-term goals of this project are to use observations and analysis of stratified flow past complex topography to understand how internal tidal interactions 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 equipped inverted echo sounders to observe the generation of internal waves generated by tidal interactions with topography in Luzon Strait, and to interpret the results using appropriate models of internal wave formation and evolution. Our approach requires the construction of an array of pressure equipped inverted echo sounders. Our plan called for eight instruments, but the size of the planned array has now been increased as a result of a separate ONR-DURIP, motivating a redesign of the array based on model calculations at different sections across the ridges. Our measurements of the internal tide between the two ridges carried out under the NLIWI program at inverted echo-sounder deployment location A1, 20.65N 121.30E show little sign of nonlinear modification such as steepening or high frequency nonlinear wave development; wave steepening and accompanying nonhydrostatic effects take place further west. However, in preparation for the IWISE pilot study to be carried out in 2010, a more complete model is required both to identify an optimum instrument array distribution and to assess other factors influencing nonlinear internal wave generation, including seasonal variations.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 2009
- Accession Number
- ADA527230
Entities
People
- David M. Farmer
Organizations
- University of Rhode Island