The two movies "Erica.qt" and "Surge.qt" are formed by combining 
the information over the intersecting areas of two phased-array
Doppler acoustic sonars. Each sonar provides a radial component
of velocity over a 90-degree by 350m pie-shaped area; they are
located about 310m apart, so the two pieces of velocity inform-
ation are fairly independent over a sizable area.

"Erica.qt" shows surface wave propogation (swell generated by the
hurricane Erica some distance away). This is a good indicator of
how well the system is working. In this movie, each frame re-
presents 1.5 seconds (it plays at 12 fps).

"Surge.qt" shows a Southward surge along the coast which was also
seen in some video measurement (by R. Holman). Here each frame
represents 30 seconds of real time (again playing at up to 12 fps,
depending on your connection & quicktime player). A little way
into the movie, the surge appears most clearly in the alongshore
component of flow; then the flow swings around toward the shore;
finally, starting from the South (bottom) the outer portion of the
flow becomes aligned with the shore (the shore is parallel to the y-
axis in these coordinates, and somewhat to the left of the area
shown). The x and y coordinates are the usual FRF coordinates.

Quicktime movies can be played in most browsers. If the quicktime
plug-in was not supplied with your browser, it is available free
from Apple (see http://www.apple.com/).

	-jerry smith