REACH 5 



ACCRETING (24 



ERODING (54.5%) 



STABLE (21 



Figure 42. Summary of shoreline movements for coastal 

 reach 5, 1857-1983 



103. Temporal examination of average shoreline movement rates shows 

 alternating erosion and accretion along the shoreline through time (Fig- 

 ure 45). Prior to 1929, most of the shoreline was mildly erosional, except 

 near inlets where strong erosion and accretion were evident. From 1920 to 

 1965, most of the shoreline was accretional. Areas that were accretional dur- 

 ing the previous period are now erosional. The most recent period, 1960 to 

 1983, alternates again, with erosion now predominant. Areas of erosion 

 between 1920 and 1965 are now areas of accretion. These data suggest large 

 changes in shoreline position occur, but net change over a long time interval 

 is quite small, as indicated in Figure 43. This is further substantiated by 

 the interval shoreline change data presented for each beach in Table 9. 



104. The long-term stable nature of this coastline is demonstrated in 

 Figure 46. Of the transects digitized in reach 6, 92.3 percent were stable 

 over the 1872-1983 span. The remainder of shoreline was equally divided 

 between accretion (4.4 percent) and erosion (3.3 percent). Temporal data sug- 

 gest alternating erosion and accretion along the arcuate strand, but clearly, 

 net changes for most of this reach are relatively minor. 



88 



