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15 October 1978 





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Distance (m) 



Figure 12. Barrier dune recession varied between 

 6 fmd 9 meters along Nauset Spit. 



extending 300 to 500 meters along the beach, with dunes up to 6 aeters high, 

 were completely leveled in some areas. Large quantities of sediment were 

 transported across the berm by overwash surges and deposited in washover fans 

 and fLats. Volumetric determinations showed that as much as 400 cubic meters 

 per meter of overwash sand was transported landward during this event, with 

 penetration distances of 250 meters bayward of the dune line and deposition 

 thicknesses up to 1.65 meters above the living salt marsh. 



3. Deposition . 



a. Intr oduction . Three sites along Nauset Spit-Easthaa were chosen for 

 study in 1977 ("Fig- 13) • Site 1 is a small washover that was created by a 

 northeaster in February 1972; this was the only washover on Nauset Spit- 

 Eastham before 1976. Site 2, located approximately 300 meters south of the 

 Coast Guard Beach parking lot, was created by a tropical stoma in September 

 1976. The washover fan was placed above a living salt marsh, which provided 

 the opportunity to monitor a washover from its inception. A third area, site 

 3, was chosen south of the former Outermost House site. The dunes in this 

 area were low and narrow, and overwash was expected to occur with the next 

 major storm (19771. Base-line data on preoverwash conditions were collected 

 in 1977 at site 3 for comparison to poststona aata. 



38 





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