FS FS - Fundamentals of Surveying Hydrographic Surveying 1

Question 1

What is hydrographic surveying primarily concerned with?

Accepted Answer

Measurement of water bodies and their underwater features

Answer

Hydrographic surveying involves measuring and mapping bodies of water, including water depths, bottom features, and shoreline positions for navigation and engineering purposes.

Question 2

What instrument is primarily used to measure water depth in hydrographic surveying?

Accepted Answer

Echo sounder (depth sounder)

Answer

An echo sounder measures water depth by transmitting acoustic pulses downward and recording the time for the echo to return from the bottom.

Question 3

What does the term 'sounding' refer to in hydrographic surveying?

Accepted Answer

A depth measurement below the water surface

Answer

A sounding is a measurement of water depth at a specific location, referenced to a chart datum and plotted on nautical charts.

Question 4

What is the standard chart datum for US nautical charts and hydrographic surveys?

Accepted Answer

Mean Lower Low Water (MLLW)

Answer

Mean Lower Low Water (MLLW) is the standard chart datum for US nautical charts, representing the average of the lower of the two daily low tides.

Question 5

What is multibeam sonar used for in hydrographic surveys?

Accepted Answer

Collecting depth profiles across a wide swath simultaneously

Answer

Multibeam sonar emits many acoustic beams simultaneously to map a wide swath of the seafloor, providing complete bottom coverage in a single pass.

FS - Fundamentals of Surveying Exam Practice Test

FS - Fundamentals of Surveying Exam Practice Test

FS FS - Fundamentals of Surveying Hydrographic Surveying 1