夏季盛行风对太湖北部藻类水华分布的影响

1996年7月1日至10月17日对太湖北部湖区进行了6次综合调查,重点分析了夏季盛行风向和风力与太湖北部藻类分布的关系。研究表明,持续稳定的风向(SSE至ESE),是表层藻类在下风区和迎风岸产生聚集的重要驱动力,湖流流向影响甚小。当主风向为SE时,表层藻类生物量和chla(叶绿素a)含量,成自东南向西北逐渐增加的倾向性分布。当平均风力在1.5～3.6m/s时,风力大小与藻类在下风区的堆积有关;风力约大于4.0m/s后,藻类水华的平面分布已不明显,垂直分布趋于均一。

Effect of Prevailing Wind in Summer on Distribution of Algal Bloom in Lake Taihu

On the bases of six-time investigations of the north part of Lake Taihu during 1st July 1997 to 17th October 1997, to analyze the relationship between the prevailing wind in summer and the distribution of algal bloom. The result showed that the continued and steady wind direction (SSE - ESE) was the important driving force which caused the superficial algae accumulated on the leeward area and windward lakeshore. When the chief wind direction was SE, the tilting distribution of algal biomass or chla was formed in gradual increase situation from SE to NW, when the average wind power was within 1.5-3.6m/s, the algal accumulation was related with the wind power. However, the wind power was over 4.0m/s, the plane distribution of the algae was not obvious and the vertical tendency was homogeneity.