Volume 12 Issue 2
Mar.  2022
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Article Navigation >  Journal of Environmental Engineering Technology  > 2022  >  12(2): 615-623
TANG Q,LIU B,WANG P,et al.Application of improved WQI model in water quality assessment of typical watershed in the hilly area of central Sichuan Province: a case study in the upper reaches of Qiongjiang River Basin[J].Journal of Environmental Engineering Technology，2022，12（2）：615-623 doi: 10.12153/j.issn.1674-991X.20210140
Citation: TANG Q,LIU B,WANG P,et al.Application of improved WQI model in water quality assessment of typical watershed in the hilly area of central Sichuan Province: a case study in the upper reaches of Qiongjiang River Basin[J].Journal of Environmental Engineering Technology，2022，12（2）：615-623 doi: 10.12153/j.issn.1674-991X.20210140
shu

Application of improved WQI model in water quality assessment of typical watershed in the hilly area of central Sichuan Province: a case study in the upper reaches of Qiongjiang River Basin

doi: 10.12153/j.issn.1674-991X.20210140
  • 1.

    State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University

  • 2.

    Emergency Center for Ecological Environmental Safety of Suining

  • 3.

    Suining Ecological Environment Monitoring Center Station

  • 4.

    Environmental Monitoring Center of Anju District, Suining City

  • Received Date: 2021-04-20
    Available Online: 2022-04-02
    Abstract
  • Water quality index (WQI) overcomes the shortcomings of traditional water quality evaluation methods that cannot satisfy both qualitative and quantitative evaluation. However, WQI requires so many evaluation indexes that it cannot be widely used. Taking the upper reaches of Qiongjiang River Basin as the representative of the typical basin in the hilly area of central Sichuan Province, the monitoring data of water quality from 2018 to 2019 were analyzed through the multiple linear stepwise regression method. One improved model, the minimum water quality index (WQImin) model, was established by choosing NH3-N, CODCr, BOD5 and DO from 25 water quality indexes. WQImin model had better predictive performance, and its evaluation results were significantly correlated with WQI (R2=0.81, PE=11.9%). According to the results of WQImin model, the average WQImin value in the upper reaches of Qiongjiang River Basin were 63.1±17.2, and the water quality grade was "good". On the whole, the WQImin value of the mainstream increased along the flow direction. When it flowed through Anju District, WQImin decreased significantly, but it could return to its pre-affected level before entering the city quickly. The WQImin values from high to low were as follows: Qiongjiang River mainstream > Huilong River > Yufeng River > Panlong River > Shidong river, and the water quality in tributaries was worse than that of main streams. Therefore, the priority of water pollution control in this area should be gradually put on the tributaries.

     

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