模式识别方法在奎河氮磷环境背景值研究中的应用  

Application of model based objective methods for environmental background value assessment of nitrogen and phosphorus in Kuihe River

作　　者：孙林华[1] 付金沐[1] 

机构地区：[1]宿州学院资源与土木工程学院,安徽宿州234000

出　　处：《安全与环境学报》2014年第5期302-306,共5页Journal of Safety and Environment

基　　金：国家自然科学基金项目(41173016);安徽省高等学校省级自然科学研究项目(KJ2013A246)

摘　　要：为了查明当前状态下奎河宿州段氮、磷环境背景值和基线值,基于相对累计频率分析和迭代标准差方法 2种模式识别方法,对奎河宿州段2010年观测的总氮和总磷数据进行分析。结果表明,奎河宿州段氮、磷污染极其严重,且总体表现出从年初到年底降低的趋势。相对累计频率分析方法将总氮、总磷质量浓度-相对累积频率曲线划分为3段:第1段总氮和总磷的平均质量浓度分别为2.26 mg/L和0.17 mg/L,第2段总氮和总磷的平均质量浓度分别为8.11 mg/L和0.84 mg/L,第3段总氮和总磷平均质量浓度分别大于11.2 mg/L和1.8 mg/L。第1和2段分别表征当前状态下的背景值和基线值,第3段则代表极端污染。采用迭代标准差方法计算得到总氮和总磷环境基线值分别为7.83 mg/L和0.68 mg/L,与根据相对累计频率分析方法计算的基线值相当。与研究区内其他河流的对比研究表明,依据模式识别方法计算的河流污染背景值和基线值与河流污染状态有关,未受人为污染的历史环境背景值依然需要从轻或无污染的监测数据中获取。The paper is intended to study the possibility of the application of model based objective method for environmental background value assessment of nitrogen and phosphorus in Kuihe River. So far as we know, there are two kinds of widely used model based objective methods （the relative cumulative frequency method and the iterative standard deviation method）, which have long been used for similar research purposes related to the pollution in the soil and groundwater, and have been applied to the total nitrogen and total phosphorus data analysis of two sections （Yangzhuang and northern Shicun） in Kuihe River, Suzhou, observed from January to December, 2010. The re- sults of our study suggest that the pollution of nitrogen and phosphorus was extremely serious in the river, and the temporal variations of the two pollutants were similar with each other that their concentrations tend to decrease from the beginning to the end of the year. The three stages of total nitrogen and total phosphorus contents have been iden- tified by the relative cumulative frequency analysis： the first stage is said to be the current environmental background value, with the mean total nitrogen and total phosphorus being 2.26 mg/L and 0.17 mg/L, respectively. The second stage can also be regarded as the current environmental baseline, the mean total nitrogen and total phosphorus are 8.11 mg/L and 0.84 mg/L, respectively. The third stage implies extremely polluted, with its total nitrogen and total phosphorus being higher than 11.2 mg/L and 1.8 mg/L, respectively, which can be thought to be associated with human activities. The environmental baseline data for the total nitrogen and total phosphorus calculated by iterative standard deviation method are 7.83 mg/L and 0.68 mg/L, respectively, with the similar results of the second stage concentra- tions obtained by the relative cumulative frequency method. This study, in combination with other studies of rivers in the study area- demonstrated that the calculation results of either the env

关 键 词：环境学 环境背景值 环境基线值 氮磷 水污染 

分 类 号：X522[环境科学与工程—环境工程]