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Stemming the Tide Controlling Introductions of Nonindigenous Species by Ships' Ballast Water (1996) / Chapter Skim
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C EXPLANATION OF BASIC STABILITY
Pages 102-105

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From page 102...
... When a stable ship is caused to heel by an external force, such as wind, wave, or turning motion (not weight shift) , the consequent change in underwater hull shape will result in (B)
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From page 103...
... Should another external force be applied, the ship may assume an angle of Boat lo fine owner sloe or may worsen the existing loll condition if there is no righting lever, GZ, to correct the assumed heel angle. In this condition the ship is said to have zero or no GM (see Figure C-2~.
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From page 104...
... However, if an external force is applied (because of wind, wave action, or the ship turning) and the ship is caused to heel, the center of gravity of the water in the ballast tanks (G~)
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From page 105...
... Should the ship, for whatever reason, continue to heel, the position of (G5) will continue to move due to the movement of the center of gravity of the affected ballast tanks, thereby reducing the vessel's GM and the resulting GZ.
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Key Terms

  • ballast tanks
  • external force
  • stable ship
  • righting moment
  • transversely stable

  • shift due
  • hull shape
  • nearly upright
  • consequent change
  • cargo shift

  • movement reduces
  • assumed heel
  • tanks partially
  • resultant height
  • gravity strive

  • move inboard
  • wave action
  • resultant righting
  • initial stability
  • resulting righting

  • underwater hull
  • weight shift
  • existing loll
  • excessive angle
  • move due

  • original righting
  • loll condition
  • whatever reason
  • metacenter height
  • thereby reducing


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