近岸陆地与海面风速关系分析研究

分析了近岸陆地与海上风速同步观测资料(1989年5—12月),发现海上风速与陆上风速之比并非总大于1。海、陆风速之比值不仅有明显的日变化,也随季节不同而异。进一步研究指出,海、陆风速比值是陆地地面粗糙度、大气稳定度、测站离岸线距离以及海面风速等因素的函数。利用大气边界层的理论和已有实验结果解释了海、陆风速比值的观测事实,并给出了该比值变化规律的一些定性结论。

AN ANALYSIS ON THE RELATIONSHIP BETWEEN THE WIND SPEEDS ONSHORE AND OFFSHORE

Simultaneous observations of wind speeds onshore and offshore have been analyzed. The data (1989.5-12) show that the rates of the wind speeds offshore to those onshore are not always over 1. Analysis indicates that the rate is a function of some factors, such as the roughness of the land station, the atmospheric stability, the station distance from the coastline and the wind speed over the sea. The observed facts have been explained theoretically by using the theories and experimental results on the boundary layer meteorology, also some regular characteristics of the rate are presented.