基于频次法与均值法的水质评价方法比较研究

Comparative Study on Water Quality Evaluation Methods Based on Frequency Method and Mean Value Method

为了确定水功能区水质评价中频次法与均值法的特点和差异,在探讨两种方法评价理论的基础上,利用大凌河流域10个水功能区水质监测站2011—2015年实测数据,分别采用频次法和均值法对水质进行评价,并分析评价结果的差异。研究结果表明:大凌河流域地表水水质状况总体较差,仅白石水库、建凌桥、阎王鼻子水库、白石断面为达标,其余均为不达标;均值法和频率法水质评价结果差异率达到37.5%,均值法评价结果达标率比频次法的评价结果较宽松,评价结果整体较好;在进行水功能区水质状况评价时,应注明采用的指标及监测数据的频次,应综合考虑区域污染源和水质变化特点,综合选择较为合适的评价方法。

In order to determine the characteristics and differences of intermediate frequency method and mean value method in wa⁃ter quality evaluation of water functional areas,based on the discussion of the two methods,the frequency method and mean value method are used to evaluate the water quality of 10 water quality monitoring stations in Daling River Basin from 2011 to 2015,and the differences of evaluation results are analyzed.The results show that the surface water quality of Daling River Basin is generally poor,only Baishi reservoir,Jianlingqiao reservoir,Yanwangbi reservoir and Baishi section are up to standard,the rest are not up to standard;the difference rate of water quality evaluation results of mean value method and frequency method is 37.5%,the rate of up to standard of mean value method is looser than that of frequency method,and the evaluation results are generally good;the water function is in progress.When evaluating the water quality status of the area,the indicators used and the frequency of monitoring data shall be indicated.The characteristics of regional pollution sources and water quality changes shall be comprehensively considered and the more appropriate evaluation method shall be comprehensively selected.