江面雾的形成及其预报

THE FORMATION AND ITS FORECAST FOR FOGS OVER THE RIVER

用1989～1992年江心固定囤船平台上观测到的第一手资料分析表明，江面雾总日数少于陆地，但一次过程持续时间比陆地长。江面雾发生时常伴有风，最大风速达10m／s，风玫瑰图表明，占优势的风向是SE、E和S。江雾常处于成片雾区内。这些差异，与江、陆之间温度日变化和风切变有关。另外，本文对江面雾的预报也作了探讨。

We make use of firsthand observations on the board of fixed ship over the River duringthe period from 1989 to 1992. The analysis showed that the number of days when fog occursover the River is less than that on land,but fog lasts longer than that on land. River's fog isbound up with wind,its maximum speed amounts to 10 m/s. Wind rose showed the prevalentwind directions are SE,E and S. The river's fog often extends farther and wider than land'sfogs. These difference can probably be explained by the interdiurnal temperature 'variationand wind shear between river and land. Furthermore,the methods for forecasting the fogsover the river are also discussed in this paper.