• Aucun résultat trouvé

CANADIAN BOARD OF EXAMINERS FOR PROFESSIONAL SURVEYORS C12 - HYDROGRAPHIC SURVEYING

N/A
N/A
Protected

Academic year: 2022

Partager "CANADIAN BOARD OF EXAMINERS FOR PROFESSIONAL SURVEYORS C12 - HYDROGRAPHIC SURVEYING"

Copied!
1
0
0
En savoir plus ( Page)

Texte intégral

(1)

CANADIAN BOARD OF EXAMINERS FOR PROFESSIONAL SURVEYORS C12 - HYDROGRAPHIC SURVEYING

Q. No Time: 3 hours Value Earned

1. Name the three ocean parameters that affect sound velocity in the ocean. 5 2. Write the equation that relates frequency, wavelength and sound velocity. 5 3. Draw a typical sound velocity profile from the warm upper layers, through the

thermocline to the deep ocean.

5

4. In relation to underwater acoustics define frequency. 2.5

5. In relation to underwater acoustics define pulse duration (pulse length). 2.5 6. In relation to the frequency of an underwater acoustic signal, what is the tradeoff

between vertical resolution and range? 5

7. What is the relationship between transducer size and its beamwidth? 5 8. Describe a bar check procedure for single beam operations. Make sure you

include a discussion on why and when this procedure is performed. 10 9.

With the help of a diagram, describe the relationship between ellipsoidal, geoidal and tidal vertical datums, as used in hydrographic operations. Explain how each are derived, what they are used for and how they are related to each other.

10

10. Write the equation that describes the relationship between sound velocity (SV),

depth (d) and the two-way-time of travel (TWTT). 5

11.

You are tasked with finding a lost MB transducer head (20cmX20cmX20cm) in 10m of water on hard bottom. What frequency would you use and how would you deploy your SSS? Explain your reasoning.

10 12.

Specific to hydrographic applications, describe the difference between Multibeam Sonars and Side Scan Sonars. Include a discussion of what each would be used for and why.

10

13. What are crosscheck lines and what are they used for? 5

14. Describe the basic principles of MBES transmit and receive beam forming and steering using curved transducers.

10

15. What IHO S-44 specification would you recommend for a harbour survey? Why? 10 Total 100

June 2020 Marks Note: This examination consists of 15 questions on 1 page.

C12 - Hydrography June 2020 Page 1 of 1

Références

Documents relatifs

7. Describe four different horizontal positioning systems/methods used in hydrography. Include: positioning type, observables, measurement instrumentation, sources of

Why is it necessary to apply motion corrections (pitch and roll) to narrow angle, single beam observations and not to wide angle, single beam observations. Use a diagram to

With the help of a diagram, describe the components necessary for reducing water depth easurements from a singlebeam transducer face to a chart datum3. Describe three of the

With the help of a diagram, describe the relationship between ellipsoidal, geoidal and tidal vertical datums, as used in hydrographic operations.. Explain how each are derived,

Using a diagram, show how a single beam transducer's beamwidth affects the6. sounding's

8 With the help of a diagram, describe the relationship between ellipsoidal, geoidal and tidal vertical datums, as used in hydrographic operations. Explain how each are derived,

Desribe the effect of transducer spacing, beam width and survey speed on full bottom ensonification from a multi-transducer, boom and acoustic sweep system5. With the help of

Why is it necessary to apply pitch and roll observations to narrow-angle single beam transducers and not wide-angle single beam transducers, under normal survey conditions5. Use

b) Bathymetric sounding surveys utilizing a single beam echo sounder are normally conducted by running a pattern of parallel straight lines. What factors may determine the

b) Aerial images have varying scale. Use a sketch to illustrate this fact. Sketch a special case where the scale in a photograph is considered constant. a) Describe the

(singlebeam, sidescan sonar, multibeam and non-acoustic), water levels, water flow, horizontal positioning, vertical positioning and hydrographic survey practice and standards..

Each candidate writing examinations will be assigned a candidate number at the beginning of each examination cycle for purposes of tracking and anonymity. The candidate will use

Many provinces define a hierarchy of plans within their planning legislation that define the general types of plans necessary for land development.. Discuss the significance

Write the equation that relates frequency, wavelength and sound velocity.. Name the three ocean parameters that effect sound velocity in

Why is it necessary to apply pitch and roll observations to narrow-angle single beam transducers and not wide-angle single beam transducers, under normal survey conditions5. Use

With the help of a diagram, describe the relationship between ellipsoidal, geoidal and tidal vertical datums, as used in hydrographic operations.. Explain how each are derived,

C-1 MATHEMATICS June 2020 Although programmable calculators may be used, candidates must show all formulae used, the substitution of values into them, and any intermediate values to

Using a diagram, show how a single beam transducer's beamwidth affects the5. soundings

Why is it necessary to apply motion corrections (pitch and roll) to narrow angle, single beam observations and not to wide angle, single beam observations..

If your side scan sonar (SSS) passed directly over a school of fish in mid-water,.. where would they appear in your

Note: This examination consists of 9 questions on 1 page. a) Name the three ocean parameters that affect sound velocity in the ocean. b) Draw two typical sound speed profiles in

Describe the basic survey “orders” as defined in the “S-44 IHO, 5th Edition, Standards for Hydrographic Surveying”. Include:9. a) horizontal and vertical uncertainties for

Describe how mineral interests are held by the various parties both within and outside of the Torrens system of land titles.. Describe the general principles of typical condominium