A complete grid survey of site 3 was not conducted after the February 1978 

 storm until June. Between June and August 1978, 312 cubic meters of sand were 

 added to site 3 throat (Fig. 23). Areas with recovering dune vegetation in 

 the northwest and southwest corners of the plot had increased in elevation by 

 15 centimeters. This situation contrasts with the large-scale deflation at 

 the nonvegetated throat area at site 1. 



During the winter of 1979, site 3 again overwashed. A channel was cut 

 through the back of the dune line. Remnant dunes in the front 30 meters of 

 the plot were leveled. By August 1979 the dunes in the northwest and south- 

 west corners of the plot were substantial features (Fig. 23). Ammophila 

 bveviligulata had trapped as much as 30 centimeters of sand. The decrease in 

 elevation of surrounding unvegetated regions caused by overwash scouring and 

 aeolian deflation further increased the topographic relief. Drift lines 

 deposited at the base of these dunes during overwash increased the areal vege- 

 tated surfaces. Unlike site 1, this site had in 2 years begun to stabilize 

 with the development of remnant dunes landward of the pre3torm dune line. 



(2) Deflation of Fan-Flats Area s. Site 1 fan was surveyed after the 

 storm to document the deflation of sediment from a washover fan. During the 

 February storm, 1920 cubic meters of sand was added to the research plot at 

 site 1 fan. Approximately 8000 cubic meters of sediment was deposited in the 

 entire washover feature. Since the plot was situated at the outer edge of the 

 washover, the surface sloped steeply toward the northwest corner (OS, 50W) , 

 which was unaffected by the storm (Fig. 24). 



Spring tides and high winds reworked the deposit, enlarging the fan in all 

 directions (Fig. 15). Between February and March 1978, only 60 cubic meters 

 was deflated from the plot (Fig. 24). The highest points in the plot at the 

 northeast corner (15S to 25S, 0W to 15W) were reduced in elevation by about 15 

 centimeters. Areas on the south side of the plot increased by as much as 22 

 centimeters. Some sediment was drawn bayward by spring tides. Six elevation 

 stations in the northwest corner of the plot that had not been affected by 

 overwash were buried by up to 7 centimeters of sand only 1 month after the 

 storm. 



The loss of sediment from the fan continued between March and August 1978. 

 The greatest deflation occurred in the spring months, tiighest elevations were 

 deflated as much as 25 centimeters; the northwest corner increased in eleva- 

 tion by an additional 5 to 20 centimeters. Areas with drift lines at the 

 outer edges of the fan did not deflate as rapidly as barren areas. The fan 

 was enlarged by as much as 90 meters by wind and tides expanding the edges of 

 the feature (Fig. 15). Overall, 300 cubic meters of sand was lost irons site 1 

 fan between March and August 1978. 



The plot was resurveyed in March 1979 (Fig. 24). Although site 1 fan had 

 overwashed during the winter of 1978-79, less than 10 centimeters of sand was 

 added to any area of the fan. During the winter, high winds deflated all the 

 areas not stabilized by vegetation. Only in drift-line areas at the outer 

 edge and in the northwest corner did the plot remain stable. As much as 44 

 centimeters of sand was lost at some elevation stations. The northwest corner 

 of the plot increased in elevation by 20 centimeters so that the entire 

 site, which had been a salt marsh, was now above MHW. The plot was becoming 



54 



X ^^^!M^^M^^^M^M^^^^^^^M&M^^^^^^^^^^ 



