【摘要】 浅水湖泊中,富营养化程度除了依赖于外源输入外,内源释放亦是举足轻重,而底泥中的内源释放主要源于风强迫作用下形成的水面波动和底层湖流产生的剪切作用,并且波浪产生的切应力远大于底层湖流产生的切应力。此外,湖岸边界处的波浪作用够侵蚀岸堤,造成泥沙堆积而由此导致航道淤积,波浪作用引起的对水体中营养盐的水平和垂直输送会造成整个湖体中不同地区的水质差异,这也是太湖蓝藻水华爆发具有季节性和区域性的原因之一。本文基于在太湖北部、中部和南部利用波浪仪所观测的数次波浪数据,分别计算了平均波、有效波和1 10大波的周期、波高和波长及其由波浪产生的切应力,并利用验证后的浅水波浪模式,对太湖中冬、夏季盛行风作用下的易悬浮区域做了计算,发现夏季东南风作用下,西北沿岸带由其水浅和风的吹程较大而易引起的底泥悬浮,而冬季受西北风影响时易悬浮区域位于太湖东南部。更多还原

【Abstract】 Eutrophication results not only from inflowing pollutants but also released nutrients from sediment resuspension which is caused by stress jointly induced by the combination of wave and current, and the stress caused by wave is much larger than that caused by bottom current in shallow lake. Wave can lead to shore erosion resulting in siltation in waterway, and nutrients transportation resulting in regional variation of nutrient concentrations, which can account for seasonality and regionality for algae bloom in Lake Taihu. Wave data is analyzed and wave stress is calculated. Based on the verified wind-wave model, wave stresses in summer and winter are also computed. The results show sediment resuspension can easily occur in the northwest area of Lake Taihu in summer with prevailing SE wind and in the southeast in winter with prevailing NW wind.更多还原