What characteristic does pebble-bottom provide in acoustic terms?

The characteristic of a pebble-bottom in acoustic terms is that it provides the best reflection. This is attributed to the irregular and hard surface created by pebbles, which allows sound waves to be reflected efficiently. The texture of a pebble-bottom creates a significant interface for sound waves, resulting in a strong echo. The varying sizes and shapes of the pebbles contribute to multiple scattering of the sound, enhancing the reflection properties further.

In the context of underwater acoustics, the ability to get strong reflections from surfaces is crucial for applications such as sonar and mapping of the seafloor. The properties of a pebble-bottom enable better detection and delineation of features because the reflected sound waves can provide clear data, improving the quality of acoustic measurements and analyses.