YokohamaHarbor
YOKOHAMA
YOKOHAMA HARBOR
Yokohama harbor is situated on the west side of Tokyo Bay. The Port of Yokohama encompasses a total water area of approximately 18,522 acres (28.94 mi2), counting the portions of rivers and canals that are also under the Port of Yokohama's jurisdiction. The Port abuts on the Port of Kawasaki to the northeast. Negishi Bay, with its many industrial facilities, is situated just south of the main Port of Yokohama. Negishi Bay is included within the greater Yokohama Port area Yokohama is a busy port, having an average of 32 deep-draft vessels entering the port each day (1991 statistic). The combined ports of Yokohama and Kawasaki are called the port of "Keihin-ko."
The inner portion of the Port of Yokohama is entered via 700 yd {640) m) wide Yokohama Passage which narrows to 416 yd (380 m) as it passes under the Yokohama Bay Bridge (Figure V-198). The bridge has a vertical clearance of 180 ft (55 m) in the center of the span and 174 ft (53 m) on either side.
Currents at or near the Port of Yokohama are primarily wind and tide driven and do not generally pose a problem to navigation. According to a local harbor chart, a flooding tidal current sets in from the outer breakwaters at an average rate of not more than 1 kt (0.5 m s-1). The ebb current flows out at a slower rate. The currents in the navigation channels outside the outer breakwaters are the strongest of all currents inside and outside the port, but they are limited to 2 kt (1.0 m s-1).
Astronomical tidal range at the port is relatively small. The average high tide is only 2.8 ft (0.84 m) above mean sea level (msl). The average low tide is -3.45 ft (-1.05 m) below msl. Extreme high tide recorded at the port is 5.25 ft (1.6 m) above msl. The extreme low tide is -5.18 ft (-1.58 m) below msl.
Source: http://www.nrlmry.navy.mil/port_studies/thh-nc/japan/yokohama/text/sect2.htm
