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Multiyear destratification study of an urban, temperate climate,eutrophic lake

机译：多年destratification研究一个城市,气候温和、湖泊富营养化

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An aeration system for destratification has been in operation since 1973 at Sweeney Lake, an urban, eutrophic lake near Minneapolis, Minnesota, USA. Water quality data are available for 19 of the 39 years, 1972-2010. Growing season (Apr-Oct) aeration was turned off in 2007-2008 to evaluate the effect of destratification on water quality. Aeration never achieved the Lorenzen and Fast (LF) complete destratification airflow criterion of 9.2 m3/min/km2. When aeration was at 51% LF, hypoxia (DO 0.05) in median Secchi disk depths, chlorophyll a concentrations, or surface total phosphorus (TP) concentrations between destratified and stratified lake conditions, but interannual variability linked to other influences, including partial stratification and stormwater inputs, limits statistical power. The median April-October lake TP mass of 67 kg in 2007-2008 (stratified conditions) was significantly higher (p < 0.0001) than the 44 kg median mass inl998-2005 and 2009 (destratified conditions). Destratification can suppress internal phosphorus loading when properly applied.
机译：destratification曝气系统自1973年以来,手术在斯威尼湖,一个明尼阿波里斯市附近的城市、湖泊富营养化,美国明尼苏达州。19的39年,1972 - 2010。(Apr-Oct)曝气在2007 - 2008年处于关机状态评估destratification对水的影响质量。快(低频)完成destratification气流标准的9.2立方米/分钟/平方公里。51%低频、缺氧( 0.05)中值塞齐盘深处,叶绿素总磷浓度,或表面(TP) destratified和之间的浓度分层湖条件,但年际变化与其他因素的影响,包括部分分层和雨水输入,统计权限。10湖TP 67公斤2007 - 2008年的质量(分层条件)显著更高比44公斤值(p < 0.0001)质量inl998 - 2005和2009 (destratified条件)。Destratification可以抑制内部磷加载时正确应用。

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