Duck Video Lab

SO422, Spring 2009

Download this file (http://www.usna.edu/Users/oceano/pguth/website/so422web/lab/duck_movie.zip), and unzip it.  It is a 500 MB download.

There are two Excel spreadsheets in this directory, which shows the tides (including the storm surges) and the waves during 2005, and a DuckMovie program which will display the hourly images of the beach.

The original data is at http://www.frf.usace.army.mil/video_now.stm

Run the DUCKMOVIE program

• You can view  snapshots or the time exposures or both.
• You can view only data from certain hours--for instance by selecting 0900 you will get any views between 0900 and 0959.
• You can restrict the movie to certain months.
• To run the program with different parameters, must restart the program.

You will do this lab in groups, and turn in the following analysis (Word, with a discussion and a series of images) by 1330 Tuesday 13 March in the course dropbox on Blackboard:

• Find a good color image for each bar type from Lippmann & Holman (1990).   Make a table that looks like their figure with the images in it.
• Fill in the spreadsheet with with the classification for each day of 2005.  Create a histogram of the number of days with each bar type. Discuss how your results for 2005 match their findings.
• Pick one storm, and get a series of images showing how the bars changed from their position before the storm, and how they returned to some form of equilibrium after the storm.  There is some missing data, and some storms might not have as clear a progression, so check carefully.  (If your group has three members, you will do this analysis for two different storms).

Lippman, T.C., and Holman, R.A., 1990, The spatial and temporal variability of sand bar morphology: Journal of Geophysical Research, vol.95, no. C7, p.11,575--11,590.

The following resources, courtesy of the Journal of Geophysical Research, may help:

Video frames of bar types.  Fig. 2, p.11,578 of Lippmann & Holman (1990).

Classification key.  Fig. 3, p.11,579 of Lippmann & Holman (1990).   The text on the top of page 11,579 discusses this decision tree.