黄河兰州段水质模糊综合评价

ake the sections of the Xisha Bridge, the Yintan Bridge, the Qilihe Bridge, the Chenguan bridge and the Yantan Bridge of the Yellow River which runs though Lanzhou City as sampling points,we have analysised Do,cCODcr,NH3-N,pH and other water quality indicators, Established a judgment matrix by making use of AHP, have abstained the evaluation of importance of various water quality indicators, Use fuzzy math in membership function to carry on the fuzzy operation again to the metrical date, get the corresponding water quality. The result showed that the water quality of Yellow river in Lanzhou worsens according to the runoff direction, such situation is relatively stable in different sections. It is basically the same as actual situation that the major polluted sections are the Xisha Bridge - the Yintan Bridge area and the Zhongshan Bridge- the Chenguan Bridge area, this may provide a certain theory reference to the Yellow River pollution prevention workers.