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Figure 1. Map showing locations where long- and short-term shoreline change rates were calculated based on extent of available shoreline data in Washington. |
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Figure 2. Map showing locations where long- and short-term shoreline change rates were calculated based on extent of available shoreline data in Oregon. |
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Figure 3. Example of an end point rate calculation using a sample dataset. The rate of 1.09 meters per year is calculated as the distance between the shorelines in 1936 (baseline) and 2005 (76.03 meters) and divided by the span of time elapsed between the two shoreline positions (69.82 years). All other shoreline data are ignored in this computation. Figure from Himmelstoss (2009). |
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Figure 4. Example of a linear regression rate calculation using a sample dataset. The rate or shoreline change was determined by plotting the shoreline positions with respect to time and calculating the linear regression equation of y = 1.34x – 2587.4. The slope of the equation describing the line is the rate (1.34 meters per year) in this example. Figure from Himmelstoss (2009). |
U.S. Department of the Interior |
U.S. Geological Survey