Which type of frequency is more accurate for measuring shoal depths but ineffective in deep water?

Ultrasonic frequencies are highly effective for measuring shoal depths due to their ability to produce detailed and accurate readings in shallow waters. These frequencies allow for precise detection of the seabed and any changes occurring within shoal areas, such as reefs or sandbars. They are ideal for surveying because they can effectively penetrate the water surface and return strong signals that can be interpreted to ascertain depth and underwater features.

In deep water, however, ultrasonic frequencies can become less effective. The propagation of sound waves can take longer, and the possibility of signal distortion increases with the depth, making it challenging to obtain accurate measurements. As a result, while ultrasonics excel in shallow areas, their efficiency diminishes significantly in deeper waters, leading to the understanding that they are best suited for shoal depth measurement rather than deep-water applications.