河道型水库基于敏感性分区的营养状态标准与评价方法研究

On the assessment methodology and standards for nutrition status in channel type reservoirs based on zoning of eutrophication sensitivity

通过对河道型水库水动力学空间特征及其与富营养化敏感性的关系研究,提出了基于河道型水库敏感分区的营养状态评价标准体系以及评价方法.采用滞留率、缓流率等水动力学概率特征指标计算敏感性风险概率指数,在此基础上将河道型水库划分为河流类型区、过渡类型区和湖泊类型区,对不同类型区分别制定营养状态评价标准.建立了由叶绿素a、总磷、总氮及其透明度组成的营养状态评价指标体系,并对各种评价指标在河道型水库的适用条件进行了分析.提出了制定河道型水库营养状态指标分级标准值的统计学分析、营养化指数与营养状态指标的回归分析、营养状态指标的阈值分析等方法.同时对河道型水库的营养状态综合评价方法进行了研究,提出了河道型水库的营养状态综合指数计算方法以及营养状态划分标准.

With the study of spatial characteristics of the hydrodynamics and its relation to the eutrophication sensitivity, an assessment method and standards for nutrition status in channel type reservoirs were proposed based on zoning of eutrophication sensitivity. The hydrodynamic probability characteristic indices such as retention ratio, sluggish flow ratio were used to calculate the probability indices of sensitivity risk, based on which, the channel type reservoirs were divided into the river type region, the transitional type region and the lake type region. Different assessment standards for nutrition status were established to each type of regions. The assessment indicators system for nutrition status includes chlorophyll a, the total phosphorus, the total nitrogen and the transparency. For each indicators we analyzed its applicable conditions in channel type reservoirs. Methods were proposed for determining standard values of nutrition status indicator classification in channel type reservoirs, including statistic analysis, regression of nutrition index and nutrition status indicators and threshold value analysis of nutrition status indices. Methods for integral assessment of nutrition status in channel type reservoirs were studied. And the calculation method of integral nutrition status indices in channel type reservoir, and standards for zoning based on nutrition status were proposed.