Hydrology, Meteorology and Tidal Current of Long Island Port

Long Island Port is a regular semidiurnal tide port. The strong wind direction is north-northeast and northwest wind, and the normal wind direction is north-northeast wind with the frequency of 10%. Southerly winds prevail from April to May, with the frequency of11-12%; From June to August, the southeast wind is dominant, and the frequency is 12- 17%. From June 165438+ 10 to June 65438+ 10 of the following year, the northwest wind is dominant, the frequency is115%, and the annual average wind speed is 5.9m/s. Typhoons (including tropical storms and severe tropical storms) affecting Long Island Port are 2-3 times a year on average, usually in July, August and September. When the typhoon path is in the sea area, there will be strong winds, heavy rains, tidal bore and big waves. Every year from 1 1 to March of the following year, cold waves occur frequently, with an average of 4 times a year. When the cold wave crosses the border, it will appear in Yanshan Mountain, with a wind force of 7-8 and lasting for 2-3 days. Thunderstorms rarely occur on Long Island, and the average annual thunderstorm days are 20-30 days, usually from April to September. The coverage condition of Changdao Port is good, only the southwest wind wave energy diffracts into the port, and the wave height is within1.0m. ..