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Effects of thermal stratification and mixing on reservoir water quality

机译：热分层和混合对储层水质的影响

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摘要

In this study, the effect of thermal stratification on water quality in a reservoir has been investigated by field observations and statistical analysis. During the summer period, when stratification is evident, field observations indicate that the observed dissolved oxygen concentrations drop well below the standard limit of 5 mg l(-1) at the thermocline, leading to the development of anoxia. The reasons for variations in the dissolved oxygen concentrations were investigated. Variations of air temperature and other meteorological factors and lateral flows from side arms of the lake were found to be responsible for the increase of dissolved oxygen concentrations. It was also observed that turbidity peaked mostly in the thermocline region, closely related to the location of the maximum density gradient and thus low turbulence stabilizing the sediments in the vertical water column. Relatively cold sediment-laden water flowing into the lake after rain events also resulted in increased turbidity at the bottom of the lake. Nondimensional analysis widely used in the literature was used to identify the strength of the stratification, but this analysis alone was found insufficient to describe the evolution of dissolved oxygen and turbidity in the water column. Thus correlation of these parameters was investigated by multivariate analysis. Fall (partial mixing), summer (no mixing), and winter (well mixed) models describe the correlation structures between the independent variables (meteorological parameters) and the dependent variables (water-quality parameters). Statistical analysis results indicate that air temperature, one day lagged wind speed, and low humidity affected variation of water-quality parameters.
机译：在这项研究中，已经通过现场观察和统计分析研究了热分层对水库水质的影响。在夏季，当分层明显时，现场观察表明，观察到的溶解氧浓度在温跃层下大大低于5 mg l（-1）的标准极限，导致缺氧。研究了溶解氧浓度变化的原因。发现气温的变化和其他气象因素以及湖泊侧臂的侧向流量是造成溶解氧浓度增加的原因。还观察到浊度主要在温跃层区域达到峰值，与最大密度梯度的位置密切相关，因此低湍流稳定了垂直水柱中的沉积物。降雨后，相对较冷的含沙水流入湖中也导致湖底的浊度增加。文献中广泛使用的无量纲分析被用于确定分层强度，但是仅此分析被发现不足以描述水柱中溶解氧和浑浊的演变。因此，通过多变量分析研究了这些参数的相关性。秋季（部分混合），夏季（不混合）和冬季（充分混合）模型描述了自变量（气象参数）和因变量（水质参数）之间的相关结构。统计分析结果表明，气温，一日风速滞后和低湿度会影响水质参数的变化。

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