Hydrology, Meteorology and Tidal Current of Long Island Port

Long Island Port belongs to a regular semidiurnal tide port. The strong wind direction is north-northeast and northwest, and the constant wind direction is north-northeast with the frequency of 10%. Southerly winds prevail from April to May, with the frequency of11-12%; From June to August, the wind is mainly southeast wind with the frequency of 12- 17%. From June 165438+ 10 to June 65438+ 10 of the following year, the northwest wind is dominant, the frequency is1-15%, 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 1 1 until March of the following year, cold waves occur frequently, with an average of 4 times a year. Cold wave will appear in inkstone when crossing the border, and the wind will reach 7-8 and last for 2-3 days. Thunderstorms rarely occur on Long Island, and the average annual thunderstorm days are 20-30 days, which usually occur from April to September. The cover condition of Long Island Port is good, only southwest wind waves can diffract into the port, and the wave height is within1.0m. ..