What is a benchmark?
A benchmark is a surveyor's mark made on a stationary object of previously determined position and elevation. A Benchmark is used as a reference point in tidal observations and beach surveys. We can use benchmarks to compare beach profiles over time and space to determine if and/or how much change has occurred.
A benchmark is a surveyor's mark made on a stationary object of previously determined position and elevation. A Benchmark is used as a reference point in tidal observations and beach surveys. We can use benchmarks to compare beach profiles over time and space to determine if and/or how much change has occurred.
Observe the locations of the following
two benchmarks (in green type) and answer the questions below based on
your acquired knowledge from the website:
Benchmark 2801 (located at the southern tip of Folly Island, SC) & 2895 (located at the northern tip).
Benchmark 2801 (located at the southern tip of Folly Island, SC) & 2895 (located at the northern tip).
| 12. |
| Double click on the image to the left. |
| These profiles represent 2 benchmarks on Folly Beach measured in 1994. See the map above for benchmark locations. |
| What can you infer about the beach based on this information? |
| 13. |
| Double click on the image to the left. |
| These profiles represent 2 benchmarks on Folly Beach measured in 1997. See the map above for benchmark locations. |
| What can you infer about the beach based on this information? |
| 14. |
| Double click on the image to the left. |
| These profiles represent 1 benchmark on Folly Beach measured at 2 different times. See the map above for benchmark location. |
| What can you infer about this benchmark
based on this information? |
