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Hydrography Midterm Reviewer
- 1. Hydrographic Survey Ildefonso, Sorbi
- 3. Deals with the physical features of the navigable portion of the earth’s surface and adjoining coastal areas.
- 4. Sounding –measurement of depth below the water surface
- 6. Making nautical charts for safety of navigation
- 7. Development and engineering projects such as piers, dams and bridges
- 9. For large areas – 2nd or 3rd order triangulation
- 10. For smaller areas – transit-tape traverse
- 11. For small detached areas – stadia, graphical, plane table methods
- 12. For long narrow river – traverse on one side
- 13. For width >1km – traverse on both sides
- 14. Vertical Control
- 17. Line of contact between the land and the body of water
- 18. USC&GS uses the high water line
- 19. It consist of:
- 20. Determination or delineation of shorelines
- 21. Location of shore details and prominent features to which soundings may be connected
- 24. Location by two angles from the shore
- 25. Location by Range and One angle from the shore
- 26. From the boat
- 27. Location by two angle from the boat
- 28. Location by Range and One angle from the boat
- 29. From both the shore and the boat
- 30. Location by One angle from the shore and from the boat
- 31. Location by Range and Time Intervals of the boat
- 32. Location by Intersecting Ranges
- 34. Parallel straight lines –> open coasts
- 35. Radiating lines –> small bays and islets
- 36. Circular curves or arcs –> isolated shoal
- 37. Spacing of Sounding Lines
- 39. Sounding Pole
- 40. The Leadline
- 44. Reduction of Sounding The reduced sounding are the reduced levels of the submarine surface in terms of the adopted datum A correction equal to the difference of level between the actual water level(gauge reading) and the datum(MLW/MLLW) is applied to the observed soundings.
- 45. Hydrographic Survey Team Officer-in-charge/Chief-of-party Left Angleman Right Angleman Recorder Fathometer attendant Leadsman Leadsman’s assistant Helmsman or Coxwain Engineer Additional general utility personnel
- 47. Nautical charts-> polyconic projection
- 48. Instruments used in the preparation of Nautical Charts
- 49. 3-arm protractor
- 51. Spacing divider
- 53. Meter Bar
- 56. Datums of a Nautical Chart
- 57. Horizontal Datum
- 58. Vertical Datum
- 59. Atlantic Ocean – Mean Low Water
- 61. Datum used
- 62. High, mean, low water lines
- 63. Soundings
- 64. Line of equal interpolated from the soundings called depth curves
- 66. All safety devices such as lighthouse, buoys etc.
- 69. By tracing paper
- 72. Method 1
- 73. Method 2
- 75. Common Terms used in Hydrography Marginal continental features Bank Continental shelf Continental slope Insular shelf Insular slope Deep Sea Depression & Deep Sea Elevations Basin Deep Depression Depth Foredeep Trench Plateadu Ridge Seamount Swell
- 76. Common Terms used in Hydrography Embayments Bay Bright Cove Harbor Inlet Gulf Coastal Features Cape Coast High-water Line Island Islet Low-water line Point
- 77. Common Terms used in Hydrography Streams Bayou Brook and Run Creek Lagoon River Slough Caldron Canyon Seavalley Valley Submarine Elevations Bank Crest Dome Knoll Ledge Pinnacle Reef Shoal Spur