TABLE 2-3 



SEA LEVEL RISE SCENARIOS TO THE YEAR 2075 



Average 

 Sea Level Annual 

 Scenario Rise by 2075 Rise 



Baseline +23.8 cm (0.78 ft) 2.5 mm 

 Low +87.0 cm (2.85 ft) 9.2 mm 

 High +159.2 cm (5.22 ft) 17.0 mm 



Annual 

 Sedimentation 

 Rate 



5 mm 

 5 mm 

 5 mm 



Annual Net 



Substrate 



Change 



+2.5 mm 



-4 . 2 mm 



-12.0 mm 



FIGURE 2-5 



ILLUSTRATION OF HOW SHORE PROTECTION AFFECTS WETLANDS 



NO 

 PROTECTION 



2075 + 185cm 



1980 + 185cm 



PROTECTION 

 AT 2020 



2075 + 185cm 



2020 + 185cm 

 1980 + 185cm 



2075 WETLANDS 



PROTECTION 

 AT 1980 



2075 + 185cm 



1980 + 185cm 



2075 SUBSTRATE 



— NO WETLANDS 

 2075 



If people build walls to protect property from rising sea level, the marsh will be squeezed 

 between the wall and the sea. Sketches show only the upper part of the wetlands which would be 

 affected by shore-protection structures. Mean sea level is off the diagram to the right. 



47 



