湖库富营养化敏感分级指数方法研究

Study of the Methodology of Sensitivity Classification Index on Eutrophication of Lakes and Reservoirs

对富营养化敏感度进行定量评估,涉及的指标往往不只一个,为此,采用多指标的无量纲化及标准化处理,提出了一种湖库富营养化敏感分级的开放性定量指标———河湖指数(RLI)。结果表明,RLI可以评估湖库不同区域水体的动力状态的差别,为湖库不同分区水体富营养化敏感程度的识别提供了新的方法。以三峡水库为实例,阐述了河湖指数(RLI)的构建形式、计算步骤,指标的取舍和使用方法。三峡水库分级结果说明,该方法采用的月尺度指标对三峡水库各支流的分级是有效的。

More than one index has to be referred when the eutrophication sensitivities are quantitatively estimated. An open quantitative index, fiver-lake index （RLI）, which has been processed by the dimensionless and standardization method, is proposed. With RLI, the difference in hydrodynamic status in a series of zones of lakes ＆ reservoirs can be evaluated, and a new method for the identification of eutrophication sensitivity in lakes or reservoirs can be obtained. The Three Gorges Reservoir is used as an example to show the frame form of RLI, computation steps, choice of indicators and application methods. The results of sensitivity classification for the Three Gorges Reservoir show that indicators at monthly scale adopted here are effective and reasonable for the tributaries of the Three Gorges Reservoir.