A Simple, Regional Characterization of Wave-Generated Ripple Geometry and Orientation [report]

Patricia Wiberg
2005 unpublished
LONG-TERM GOALS The goal of this study is to provide a simple, regional characterization of wave-generated ripple spacing, height and orientation through time. The approach is being tested against data collected during the Ripple DRI in association with the SAX04 field experiments as well as future Ripple DRI field campaigns. OBJECTIVES This project revisits the Wiberg and Harris (1994) method for calculating ripple geometry with three objectives in mind: 1) to review the literature for
more » ... erature for wave-generated ripple measurements made since our 1994 compilation, compare them to the ripple scalings we developed, and update our model as necessary; 2) to couple the ripple calculations with the SWAN and/or WaveWatchIII wave model to consider the regional-scale spatial and temporal distribution of wave-formed ripples; and 3) extend the wave ripple calculations to include ripple realignment and degradation. APPROACH The simple method for estimating wave-generated ripple height and spacing developed by Wiberg and Harris (1994) is being used to estimate ripple characteristics regionally and through time. The method requires near-bed wave orbital diameter, grain size and water depth as input. Wave models such as WaveWatch III and SWAN provide the necessary wave data, and dbSEABED, a marine sediment database, has been used to characterize grain size until site specific data become available. Results are being compared to field measurements of ripple dynamics collected by other members of the Ripples DRI program. WORK COMPLETED 1) The literature review is essentially complete. All of the original data sets used by Wiberg and Harris as well as the new data sets found in our literature review have been entered into a spreadsheet of ripple data with related wave and sediment parameters. Copies of the list of papers found in our review and the spreadsheet are available on request. Report Documentation Page Form Approved OMB No. 0704-0188 Public reporting burden for the collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden, to Washington Headquarters Services, Directorate for Information Operations and Reports, 1215 Jefferson Davis Highway, Suite 1204, Arlington VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to a penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number.
doi:10.21236/ada610263 fatcat:2hjy6kdm5veyxnuupuvnudcq2a