摘要
针对饮用水水源地水质健康评价研究方法中的不足,提出使用时序全局主成分分析与熵权法结合的新工具,构造水质生态健康综合指数。使用时序全局主成分分析,能将截面数据扩展到面板数据,保证评价体系的统一性、整体性与可比性。此外,将原始数据降维至互不相关的若干主成分再代入熵权法,可防止无效信息重复赋权。运用新工具对厦门市“一江两库”水质健康评价,结果表明:(1)新方法与营养状态指数法显著负相关,验证此方法结果准确有效。(2)坂头-石兜水库、九龙江和汀溪水库的年均水质生态健康综合指数分别为0.608、0.372和0.774,评级分别为好、较差和好。(3)从时间变化趋势来看,坂头-石兜水库呈现“V型”反转;九龙江季节变动更明显,总体呈现改善趋势;汀溪水库一直处于最佳,波动较小。
In view of the shortcomings of regional water quality health assessment methods,a new method combining time series global principal component analysis and entropy weight method was proposed to construct the water quality ecological health comprehensive index.The new evaluation tool had two advantages.Firstly,the section data was extended to the panel data to ensure the unity,integrity and comparability of the evaluation system.Secondly,the dimension of the original data was reduced to several unrelated principal components and then substituted into the entropy weight method to prevent the repetitive weighting of invalid information.The method was used to assess drinking water quality in Xiamen,The results showed that there was a significant negative correlation between the new method and the nutritional status index method ensured the accuracy of the method.The water quality ecological health comprehensive index of Bantou-Shidou reservoir,Jiulong River and Tingxi reservoir were 0.608,0.372 and 0.774 respectively,which were rated as good,poor and good.From the perspective of time change trend,Bantou-Shidou reservoir presented a "V-shaped" inversion;Jiulong River had a more obvious seasonal variation showing an overall improvement trend;Tingxi reservoir had always been in the best position with small fluctuation.
作者
吕秀勤
LV Xiu-qin(Xiamen Environmental Monitoring Station,Xiamen Fujian 361021,China)
出处
《环境科学导刊》
2023年第1期68-76,共9页
Environmental Science Survey
关键词
时序全局主成分分析
熵权法
水质健康评价
厦门饮用水源
time series global principal component analysis
entropy weight method
assessment of regional water quality
drinking water source in Xiamen
