oblique angle from shore normal, trending northwest to southeast, as evidenced by the shear
bank on the south side. Within a few days (March 18), a broad spit had formed on the south
side, and a narrower wing spit had also formed on the north side, redirecting the flow along a
southwest-to-northeast axis. The minimum width of the breach was 91 m +/-5 m as determined
from the March 18 photograph. An ebb shoal deposit is observed on March 27 that is located
slightly to the north with respect to the breach, a location consistent with the inferred initial
orientation of the breach. By April 6, the breach had closed at low tide, but was observed to
have water in it on higher tide. The ebb shoal had begun welding to shore, and it evidently
spread north and south to form a wide deposit across the breach by April 18. The flood shoal
appears to diminish in area; however, there is no transporting force to remove sediment from this
shoal. The apparent diminution in areal extent of the flood shoal and breach margins is an
artifact of water level in the lagoon that rose after the breach closed.
The sequence of four photographs was rectified by reference to the log on the south side of
the breach and other features common to all photographs. The result of tracing the interpreted
dry beach perimeter is shown in Figure 12. The interpreted dry shorelines on the northeastern
side of the barrier spit and on the straight southeastern bank do not show significant change in
location, owing to their relatively steep slopes. The perimeter of the flood shoal and large spit
located on the southeastern side of the breach decreases each week of sampling because of the
mild slopes of these deposits. According to Figure 3, infilling of the lagoon by creeks and runoff