Clatsop Plains Shoreline Change
Clatsop Plains Shoreline Change Findings
- Prior to jetty construction the beach was accreting at a
relatively slow, uniform rate.
- Immediately following
jetty construction, the shoreline accreted rapidly along the
northern part of the sub-cell and remained relatively stable
along the southern part of the sub-cell.
- The shoreline at the red transect (closest to the jetty)
accreted most rapidly between the 1870s and 1920s. The
progradation exceeded 1000 m (3280 ft) during that time
- By the 1920s, the beach at the northern end of the
sub-cell began to stabilize or erode, while at the southern
end of the sub-cell, the beaches began a period of rapid
- By the end of the 1950s, accretion throughout
the sub-cell began to taper off.
- The length and height of the jetty combined with the
sediment supply determines shoreline change.
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