Ports and Harbors Flashcards
The maximum current velocity through the harbor entrance should not exceed ___.
1.5 m/s or 3 knots
The stopping distance of a loaded ship is _____.
7 to 8 times the ship’s length
AN instrument used to measure the intensity of wind.
Beuforts Scale
The ratio of the wave length to its height for ocean waves is between
17 and 33
An open water of navigable depth is called __
Fairway
Waves generated by storms, which occurs outside area of observation.
Swells
Waves generated by wind that are acting on the sea surface bordering on the port site.
Wind wave
Waves in which the ratio of water depth to the wave length is greater than 0.5
Deep water waves
Waves in which the ratio of water depth to the wave length is less than 0.5 but greater than 0.4
Intermediate water waves
Waves in which the ratio of water depth to the wave length is less than or equal to 0.4
Shallow water wave
The arithmetical mean value of the highest, one third of the waves for a stated interval.
Significant wave height
An abnormal rise of the sea level that occurs when a typhoon passes by.
Storm surge
The distance that the wind blows over the sea in generating the waves is known as:
Fetch
The ratio of the wave height to its wave length is called:
steepness
The falling tide
Ebb Tide
Waves with an extremely long period that mainly occur when there is a sudden large scale se floor movements associated severe, shallow focus earthquake.
Tsunamis
The difference in height between the mean higher high water and mean lower low water.
Diurnal Range
The highest tides which occur at intervals of half a lunar month is called
Spring Tides
The difference in height between high water and low water at a tidal station is called ___.
Tidal Range
Waves formed by moving ship or boats are called _____
Wakes
Waves formed by earthquake disturbances.
Tsunamis
Waves formed by gravitational attraction of the moon and sun
Tides
The spread of energy along a wave crest is called ____
Diffraction
The bending of waves as they slow down.
Refraction
