熵权-TOPSIS模型在九龙江北溪水质评价中的研究与应用

Study and Application of Entropy Weight-TOPSIS Model in Water Quality Evaluation of Jiulong River

九龙江是福建第二大河流,其中北溪(龙岩段)的水环境质量对龙岩地区的经济和民生起着至关重要的作用。本文着重应用熵权法计算了化学指标pH、DO、COD_(Mn)、BOD_(5)、NH_(3)^(-)N、TP的权重,采用《地表水环境质量标准(GB3838-2002)》结合TOPSIS模型法对2018年九龙江北溪(龙岩段)8个监测断面的地表水环境质量进行评价。结果表明:2018年九龙江北溪龙岩境内各断面水质均在Ⅲ类以上,评价为优良(梧地桥>渡头>涵口村>Ⅰ类>九鹏溪口>溪南溪口>泽源电站>进庄大桥>Ⅱ类>雁石桥>Ⅲ类>Ⅳ类>Ⅴ类)。

Jiulong River is the second largest river in Fujian province.The water quality of Beixi(Longyan)of this river plays a vital role in local economy and people's livelihood.In this study,the weight of pH,DO,COD_(Mn),BOD_(5),NH_(3)^(-)N and TP was calculated through entropy weight method,respectively.Referring to Surface Water Environmental Quality Standard(GB3838-2002),real-time data of eight monitored sections in 2018 were evaluated by using Entropy Weight-TOPSIS model method.The results shows that the water quality of all selected sections in 2018 is above Class Ⅲ and is all evaluated as excellent(Wudi Bridge>Dudou>Hankou Village>Class Ⅰ>Jiupeng Xikou>Xinan Xikou>Zeyuan Power Station>Jinzhuang Bridge>Class Ⅱ>Yanshi Bridge>Class Ⅲ>Class Ⅳ>Class Ⅴ).