Simply by measuring the time it takes for the sonar 'ping' to return to the device that sent it. The speed of sound is constant - and dividing the time by the speed of sound gives the distance !
Sea Songs for Landlocked Sailors was created in 1999.
The depth of the sea can be determined by measuring the time taken for sound waves to travel from a source to the seafloor and back to a receiver. By knowing the speed of sound in water, scientists can calculate the distance to the seafloor based on the time taken for the sound waves to return. This method is known as echo sounding or sonar.
Sound waves are used to measure the depth of the sea through a technique called sonar (Sound Navigation and Ranging). In this method, sound pulses are emitted from a vessel, and the time it takes for the echoes of these pulses to return after hitting the seabed is measured. By knowing the speed of sound in water, the depth can be calculated using the formula: depth = (speed of sound in water × time) / 2. This technique is essential for underwater mapping and navigation.
The speed of sound in water is affected by temperature, salinity, pressure, and depth. Typically, the speed of sound increases with depth due to increased pressure, so it is likely louder at 300 feet below sea level compared to 200 feet.
SAILORS!
the density of sea increases with depth
no human can live in the depth sea
great sailors
Sailors call long sea journeys by sea "Voyages"
sailors measure distances at sea in nautical miles
no human being can live on the depth sea