Lecture 5A

Question 1

Process that determines depths and terrain configuration of the bottoms of water bodies, used to prepare hydrographic maps

Answer 1

Hydrographic Surveys

Question 2

Project Types Related to Hydrography

Answer 2

1.Oil/Gas Development
2.Dredging
3.Sea Defences
4.Deep Sea Mining
5.Outfalls

Question 3

hydrographer’s worksheet used in the field to plot the details of the survey while it is still in progress

Answer 3

Boat Sheets

Question 4

office plots of all data gathered during survey. These represent the data after all corrections have been applied. Depths are commonly in fathoms (6 feet)

Answer 4

Smooth Sheets

Question 5

Acronym: IHO, Sets hydrographic
standards to be agreed
upon by the member
nations.

Answer 5

International Hydrographic Organization

Question 6

Hydrographic Process: Determination of Depths

Answer 6

Soundings

Question 7

Hydrographic Process: Determination of Positions

Answer 7

Locating Soundings/Point-fixing

Question 8

Specific tide levels used as surfaces of reference for depth measurements in the sea and as a base for the determination of elevation on land

Answer 8

Tidal Datum

Question 9

To facilitate the process of establishing a tidal datum, ________ are operated at various locations

Answer 9

Tide Station

Question 10

process of measuring the depth of a body of water at a particular point

Answer 10

Soundings

Question 11

The antenna in the SONAR converts the electric energy from the transmitter to high frequency sound.

Answer 11

Transducers

Question 12

process of measuring the horizontal position of a
depth of a body of water at a particular point

Answer 12

Locating Soundings

Question 13

Electronic positioning for rapid determination of position even under adverse weather conditions

Answer 13

Short Range Navigation (ShoRaN)

Question 14

The principle employed in long range navigation is similar to ShoRaNexcept for the use and transmission of high pulses electromagnetic energy

Answer 14

Long Range Navigation (LoRaN)

Question 15

Used to determine the position of survey vessels, Time of the subaqueous sound from the ship to reach two (2) receiving stations of known position is used to determine the position

Answer 15

Radio Acoustic Ranging (RAR)

Question 16

All these systems use time difference and trilateration
techniques to determine a position

Answer 16

Land-Based Positioning Systems

Question 17

a real-time, all-weather, 24-hour, worldwide, three-dimensional absolute satellite-based positioning system.

Answer 17

Global Navigation Satellite Systems (GNSS)