Discussion
Match each monitoring technique with what it provides.
List I
A. Beach profile survey
B. Aerial photography
C. Airborne lidar
D. Wave buoy
List II
1. high resolution topography over long frontages
2. cross sectional change at fixed lines
3. the incident wave climate driving the change
4. planform shoreline position over time
Answer: C
Correct answer: A-2, B-4, C-1, D-3
Each technique answers a different question. A profile survey measures cross-sectional change along fixed lines, which is what volume calculations require. Aerial photography gives the planform position of the shoreline through time. Lidar covers long frontages in three dimensions at high resolution. And a wave buoy records the forcing, without which the observed changes cannot be attributed to a cause.
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