Each plot was delimited by two base lines with transects established from 

 one base line to the other. With the exception of site 1 throat, where tran- 

 sects were 3 meters apart, all transects were spaced at 5-roeter intervals. 



Temporary bench marks tied to a permanent U.S. Geological Survey bench 

 mark were established at each site. Elevation readings were taken at flagged 

 locations on each plot using an automatic level. Elevation stations were 

 named according to transect number and distance from the eastern base line. 

 The northern stake in the eastern base line was designated as South (OS). 

 Other transects were labeled according to their distance south and west of 

 this northeastern stake. 



Site 1 throat consists of a 24-meter base line with nine transects which 

 extend 100 meters to the west. In 1977 this site consisted of the entire 

 washover throat of site 1 with some adjacent dunes. Complete surveys of site 

 1 throat, from 0W to 100W aloig each transect, were conducted quarterly during 

 1977 and 1978, while surveys of the first 60 meters (Ow to 60W) , the area 

 affected most by storms until February 1978, were conducted monthly and when- 

 ever major changes in elevation occurred. Two transects, OS and 9S, were 

 surveyed monthly from the ocean base line eastward toward the ocean to docu- 

 ment changes in the beach profile. 



Site 1 fan has a 60-meter base line with 13 transects extending 50 meters 

 to the west. This site included the remnant of the 1972 washover, which was 

 not overwashed again until 1978. The entire site was surveyed quarterly and 

 after overwash deposition on the marsh. 



Site 2 also has a 60-meter base line with 13 transects extending 50 meters 

 to the west. When first overwashed in September 1976, site 2 consisted of a 

 very small washover and surrounding unaffected marsh. This site was surveyed 

 in 1977 and in February 1978, but has not been resurveyed since then because 

 overwash has continued to alter the area, with almost each spring tide prevent- 

 ing revegetation. 



Site 3 throat has a 30-meter base line with seven 50-meter transects 

 extending west across the dune line; two transects (OS and 15S) extend to the 

 ocean. In 1977 site 3 throat consisted of Low profile dunes sparsely covered 

 with vegetation. A small washover was formed by the storm on 10 Hay 1977, 

 resulting in only minor erosion and deposition. This area was surveyed 

 quarterly in 1977 and 1978 and has since been surveyed annually and after 

 major storms. 



Site 3 fan has a 30-meter base line with seven transects extending 60 

 meters to the west. When this site was first established i:i 1977, overwash 

 had not occurred. Several of the elevation transects exter.ued beyond the 

 washover fan formed in 1978 to the first creek in the marsh. Surveys were 

 conducted quarterly in 197 7 and 1978 and have since been conducted annually. 



In addition to the systematic measureiaent of elevation changes, sand plugs 

 were used for monitoring the depth of erosion to calculate the gross sand 

 deposition (King, 1951; Leatherman, 1976). A series of holes, 5 meters apart 

 and I meter deep, were excavated along transect 9S at site 1 throat. A rod 

 was aeld in each hole, which was then filled and tamped. Washover sand was 

 spray-painted and dried. The rod was removed from the hole, and the resulting 



40 



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