Station 18
Condomania: Variation in Erosion Rates at Station 18

    C A L C U L A T O R
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    [Click on the blank on the left and center a value. Hit the tab key and enter the other value. Click on the operation that you want to preform.]

    Use the calculator above to fill in the blanks in the Shoreline Changes Table for Station 18 that follows.

    Look at the table and decide what operation you need to perform to fill in the blank. Position your cursor in the answer box and type in your answer. Push the return key on your keyboard. The correct answer will appear. If your answer was correct it will appear in green. If it was incorrect it will appear in red.

    Shoreline Changes At Station 18

    Time PeriodDistance (feet)Rate (feet per year)
    1852-1930 : (78 years)+ 3,300 feet+ 42.0 feet/year
    1930-1956 : (26 years)- 1,350 feet
    1956-1965 : (9 years)- 52.8 feet/year
    1965-1974 : (9 years)- 300 feet
    1852-1974 : (122 years)
    1930-1974 : (44 years)

    Multiple choice  

    1. From 1852 to 1930, the shoreline at Station 18 was _______

        accreting
        eroding
        staying constant

    2. Prior to the construction of the Freeport Jetty in 1909, the sands along the shoreline at Station 18 were probably dominated by the growth of the Old Brazos River Delta.

        True
        False

    3. From 1930 to 1974, the shoreline at Station 18 was _______

        accreting
        eroding
        staying constant

    Thus, it is misleading to use the 122 year time interval as the basis of an analysis of whether the shoreline is accreting or eroding or staying constant.

    A plot of erosion/accretion rate versus time for Station 18 is given below. The average rate is marked with a large red dot. The length of each time interval is indicated by the length of the line segment going through each red dot. The horizontal line at 0.0 marks the boundary between accretion (above) and erosion (below).

    The heavy blue line marks the 122 year accretion rate of about 10 feet per year. Your previous work showed that from 1930 to 1974, the shoreline was eroding at a rate of nearly 50 feet per year.

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