2004年夏季太湖梅梁湾席状漂浮水华风力漂移入湾量计算

太湖北部重度水华暴发时,在夏季盛行风推动下,漂浮的席状水华可由大太湖漂移进入位于太湖北部的梅梁湾,使湾内的水华加剧.本文通过室内风箱水槽实验和野外观测,对水华的风力漂移作了定量研究,建立了风速与水华漂移速度的指数相关方程.并据此对2004年夏季太湖北部发生席状水华的6d分别计算了水华风力漂移入湾量.6d中,只有2004-07-31水华漂移是由湾内向大太湖输出,且量很小,只有0.05 km²;其余5d水华漂移进入梅梁湾的面积占整个梅梁湾面积的3.7%～13.3%,进入量最大的是2004-06-11,达17.4km²,最少的是2004-07-30,为4.8 km².

Importation of Wind-Driven Drift of Mat-Like Algae Bloom into Meiliang Bay of Taihu Lake in 2004 Summer

Driven by the prevailing south wind in summer, floating mat-like algal blooms in the open area of Taihu Lake would drift into Meiliang Bay located in the northern part of Taihu Lake. An exponential relationship between wind speed and algal drift velocity was found through controlled flume experiments and field observations. Then the relationship was applied to compute drift importation into Meiliang Bay in six dates when mat-like algal blooms were happening. During the six dates, except on 2004-07-31 the algal boom drifted outwards from Meiliang Bay with slight amounts of 0.05km^2; for the rest of dates, the importations were inwards positive, the maximum importation occurred on 2004-06-11, being 17.4km^2, and the minimum importation on 2004-07-30, being 4.8km^2; The results indicated importation of wind-driven algae drift during 24 hours accounts for 3.7 % - 13.3 % of the area of Meiliang Bay.