Beach Erosion Rates
The data table provided on the following page lists shoreline changes that occurred along a hypothetical beach between 1890 and 2014. As you can see, there has been substantial coastal retreat since 1890. Use the data provided in this table to answer the following questions concerning beach erosion rates.
Question 12: Complete the data table below, and then answer the following questions.
a) Using the completed sections of the table below as a guide, complete columns C, D, and E.
Beach Retreat Data:
A B C D E
Amount of
Amount of retreat retreat during Number of years Average Change
Year relative to 1890 interval (feet) in interval ft/yr/interval
1890 0
1930 501 501 40 12.5
1950 775 274 20 13.7
1962 953
1977 1,001
1996 1,248
2014 1,429
b) How much beach retreat has occurred between 1890 and 2014?
c) How many years in the interval 1890 to 2014?
d) What is the average amount of beach retreat per year? (round to nearest tenth)