Hydrographic Survey Specifications in Nigeria
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Questions and Answers

What is the primary purpose of the specification for Hydrographic Surveys presented by SURCON?

  • To provide a guideline for environmental policies in surveying.
  • To promote hydrographic surveying as a career in Nigeria.
  • To establish standards for hydrographic surveys in Nigeria. (correct)
  • To outline penalties for improper surveying practices.

    • Who is responsible for the final approval of the specifications for Hydrographic Surveys?

  • The President of the Surveyors Council of Nigeria. (correct)
  • The expert reviewers who participated in the review process.
  • The stakeholders involved in the production of the document.
  • The government of Nigeria.

    • What must surveyors in Nigeria do in relation to the specifications for Hydrographic Surveys?

  • Consult with the public before implementing the specifications.
  • Use the specifications as suggestions rather than mandates.
  • Adhere to the procedures and methods specified in the document. (correct)
  • Limit their surveying activities to coastal areas only.

    • What action does SURCON encourage beyond mere possession of the Specification for Hydrographic Surveys?

    <p>To actively apply the specifications in surveying practices.</p> Signup and view all the answers

    What does the Enabling Act, Cap 425 of the Laws of the Federation of Nigeria empower SURCON to do?

    <p>Mandate adherence to specified surveying standards.</p> Signup and view all the answers

    What is a primary limitation of side scan sonar equipment mentioned?

    <p>Limited speed at which it can be operated.</p> Signup and view all the answers

    Which hydrographic survey equipment is known for sub-decimetre accuracy in shallow water?

    <p>Single beam echo sounder</p> Signup and view all the answers

    What factor does NOT affect the density of sounding in hydrographic surveys?

    <p>The temperature of water</p> Signup and view all the answers

    What is the maximum line spacing applicable for a depth greater than 40 m?

    <p>25 m or 200 m, whichever is greater</p> Signup and view all the answers

    What is a significant advantage of airborne laser sounding technology?

    <p>Can measure depths of 50m or more.</p> Signup and view all the answers

    What is considered mandatory in some hydrographic agencies when using side scan sonar?

    <p>Overlaps of 100% or more are often prescribed.</p> Signup and view all the answers

    How is depth accuracy error limited according to the provided values?

    <p>±v?[a] based on wave length</p> Signup and view all the answers

    Which technology is developing rapidly and offers great potential for total seafloor search?

    <p>Multibeam echosounder</p> Signup and view all the answers

    What determines water depth in the context provided?

    <p>Distance from the seabed to the still water level</p> Signup and view all the answers

    What is the definition of water level as given in the content?

    <p>Elevation at a specific point over time</p> Signup and view all the answers

    Why might many hydrographic surveys continue to use single beam echo sounders?

    <p>Cost-effectiveness for general surveys.</p> Signup and view all the answers

    What is a critical consideration in planning hydrographic surveys?

    <p>Depth and bottom conditions of the survey area.</p> Signup and view all the answers

    Which statement best describes a seismic sea wave?

    <p>Also termed as a tidal wave</p> Signup and view all the answers

    What capability must the computer possess according to the content?

    <p>Interface for real-time data acquisition</p> Signup and view all the answers

    What is the significance of introducing values into the formula ±v?[a]?

    <p>To assess depth measurement reliability</p> Signup and view all the answers

    Which condition potentially influences the calculation of water level?

    <p>Short period disturbances in the body of water</p> Signup and view all the answers

    What is the primary purpose of an isobath on a chart?

    <p>To connect points of equal water depth.</p> Signup and view all the answers

    Which method is NOT typically used for determining seabed characteristics?

    <p>Thermal imaging</p> Signup and view all the answers

    What is the recommended spacing for sampling according to seabed geology?

    <p>10 times that of the selected line spacing</p> Signup and view all the answers

    Which of the following statements regarding jetties is false?

    <p>Jetties are primarily built to prevent erosion.</p> Signup and view all the answers

    Why is physical sampling essential for inference techniques in seabed analysis?

    <p>To verify the validity of inferred data.</p> Signup and view all the answers

    What does the term 'Mean Higher High Water' (MHHW) represent?

    <p>The arithmetic average of higher high waters over a specific period.</p> Signup and view all the answers

    What is the maximum depth at which sampling is typically required?

    <p>200 meters</p> Signup and view all the answers

    What does the term 'maximum ebb' refer to in tidal flow?

    <p>The strongest tidal current at low tide.</p> Signup and view all the answers

    How should anomalous depths reported near the survey area be handled?

    <p>They should be verified and analyzed in detail.</p> Signup and view all the answers

    What is the primary characteristic of an Exclusive Economic Zone (EEZ)?

    <p>An area that extends up to 200 km of the continental shelf.</p> Signup and view all the answers

    What is the maximum recommended interval between cross-check lines in a survey?

    <p>1.5 meters</p> Signup and view all the answers

    What does 'Great Diurnal Range' specifically measure?

    <p>The difference in height between MHHW and mean low water.</p> Signup and view all the answers

    Which structure is commonly referred to as a 'Groin'?

    <p>A shoreline structure for trapping littoral drift.</p> Signup and view all the answers

    During shallow water soundings, what should be prioritized when selecting sounding points?

    <p>Peaks, deeps, and points of change in slope.</p> Signup and view all the answers

    What is the purpose of the corrections applied to shorter periods of observation for tidal data?

    <p>To eliminate known variations and maintain consistency.</p> Signup and view all the answers

    What is the definition of 'Mean High Water' (MHW)?

    <p>The average elevation of all high waters recorded over a period.</p> Signup and view all the answers

    Study Notes

    Hydrographic Survey Specifications

    • The Surveyors Council of Nigeria (SURCON) has introduced specifications for hydrographic surveys.
    • These specifications aim to standardize the practice of hydrographic surveys in Nigerian waters.
    • SURCON mandates all legally qualified surveyors to comply with the procedures outlined in the specifications.
    • The specifications were developed through an expert review process and a stakeholder workshop.
    • The specifications address the need for accurate hydrographic surveys in various sectors including oil exploration, exploitation and spill management.
    • The specifications highlight the importance of considering the state of the art depth measurement equipment, including single beam echo sounders, side scan sonar, multibeam echosounders, and airborne laser sounding.
    • The document emphasizes the importance of conducting comprehensive surveys to ensure the detection of navigational hazards.
    • The specifications include detailed guidance on aspects like the interpretation of survey data, bottom sampling, and the accuracy of depth measurements.
    • The document also provides technical definitions of relevant terms like Tidal Wave, Water Level, and Mean Higher High Water.
    • The document encourages ongoing feedback and revisions to ensure the specifications remain current and effective.

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    Related Documents

    Hydrographic Survey Standards in Nigeria PDF

    Description

    Explore the newly introduced hydrographic survey specifications by the Surveyors Council of Nigeria (SURCON). This quiz covers the standard procedures for conducting hydrographic surveys in Nigerian waters, highlighting technology and practices essential for accurate measurements and hazard detection in various sectors like oil exploration. Test your knowledge on the specifications and procedures mandated for qualified surveyors.

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