site is located in an area where net longshore transport is mixed (Fig. 5) 

 so a change in the direction of longshore transport is not unexpected. 



6. Profile Site 6 . 



This site (Fig. 11) showed no erosion to the adjacent dunes during 

 the study period. However, there was a significant loss of beach 

 sediment during the second year. The absence of dune erosion at this 

 site can be attributed to the convergence of littoral transport and the 

 associated abundance of beach sand in the area. 



7. Profile Site 7. 



During the first year this site (Fig. 12) experienced the most erosion 

 of all 17 sites (Table 4); erosion was spread over all months with most 

 occurring in November and December, a time of expected high wave energy. 

 The 8 feet of erosion in late December and early January was unusual. 

 Only one other site experienced erosion during each of those periods and 

 it was a different site in each period. 



Erosion was restricted to the November-December interval during the 

 second year, a period when eight sites showed erosion. 



8. Profile Site 8 . 



Although this site (Fig. 13) had no significant bluff erosion during 

 the study period, a considerable amount of erosion occurred beginning 

 about 100 yards south of the profile site. The beach was typically 

 characterized by thick lag concentrates of heavy minerals, and there was 

 some accretion during the second year. 



The location of this site, adjacent to an area of shore protection, 

 is probably a factor in its stability. The profile is about 100 feet 

 south of a stretch of coast that has been stabilized by large blocks of 

 concrete that protect the road adjacent to the lake. This stabilized 

 zone extends for about one-quarter mile. Immediately north is a stream 

 which serves as the outlet for Duck Lake. The beach is wide, shows no 

 signs of erosion, and is partly sheltered by the concrete revetment. 

 Storm waves are prevented from impinging on the beach but have consider- 

 able effect immediately to the south. The revetment also retards the 

 normal southerly longshore transport. 



9. Profile Site 9 . 



This site (Fig. 14) experienced moderate terrace erosion during the 

 study period, receding 6 feet the spring of 1971 and 3 feet the following 

 fall (Table 4). Other than site 7, this was the only site to experience 

 more than 1 foot of recession during the spring of 1971. A possible 

 reason for the recession was the narrow width of the beach which 

 permitted a direct attack of low-intensity spring storms on the foredune 

 terrace. 



