Passage V

Seashore cliffs often lose rock or sediment to wave erosion. Figure 1 shows cliff compositions; cliff heights, in meters (m); and the net change in mean high water mark (MHWM), in m, from 1880 to 1970 along a section of shoreline. A net negative change in MHWM indicates a net loss of rock or sediment and a net positive change indicates a net gain of sediment.

Table 1 shows the percentage of a year that vertical sections of a cliff are exposed to wave erosion.

Figure 2 shows Cliff E and F erosion rates, in cm/yr, as they relate to percentage of a year that a cliff section is exposed to wave erosion.