ACCURACY OF THE TIDE TABLES FOR THE DETERMINATION OF THE UNDER KEEL CLEARANCE - I. FIVE MAIN PORTS IN JAPAN

Navigators must estimate the sea level from tide tables in order to determine under keel clearance in shallow waters. Based on one year long data at 5 main ports in Japan (Tokyo, Nagoya, Osaka, Kobe and Shimonoseki), the accuracy of the tide tables estimated values, the height and time at high and low water were examined. The differences between estimated and observed values (observed value minus estimated value) fluctuate with a period of ten days. The monthly mean of the height difference is positive in spring and autumn, and negative in summer and winter. The monthly mean of the time difference is positive in autumn and negative in spring in Tokyo and Nagoya ports, but in the other 3 ports the monthly mean fluctuates twice a year. The monthly means of the height and time differences are bigger in Osaka and Kobe ports than in the other 3 ports.

  • Supplemental Notes:
    • J Japan Inst Navigation, v 93, Sept 1995, p 27 [7 p, 8 ref, 1 tab, 6 fig]
  • Authors:
    • Ichikawa, Y
    • Ishida, H
  • Publication Date: 1995

Language

  • Japanese

Subject/Index Terms

Filing Info

  • Accession Number: 00718716
  • Record Type: Publication
  • Source Agency: British Maritime Technology
  • Files: TRIS
  • Created Date: Mar 27 1996 12:00AM