Correlative Analysis among AHP-based Scenic Beauty Estimation and Water Quality Indicators of 2 Typical Urban Constructed WQT Wetlands

Abstract Urban constructed water quality treatment (WQT) wetlands are often designed for removing pollutants, i.e., DO, CODCr, NH3-N, and TP. The water environment of WQT wetland waterscapes is strongly related to water quality, while scenic beauty values help achieve better water environments. To reveal correlations between several water quality indicators (WQIs) and scenic beauty indexes (SBIs), an AHP-based scenic beauty estimation (SBE) per site in 2 constructed WQT wetlands has been developed in the research. The weights of indicators are determined by the AHP voting method, which includes 3 main criteria, i.e., conditions of vegetation, physical geographic conditions, and human geographic conditions. SBIs are calculated by voting by judges from professional and unprofessional groups. WQIs of pollutants were sampled in situ during the field research simultaneously. Relationships among SBIs and WQIs are indicated by correlative analysis and a linear regression model with multiple variables. Applications for WQT wetland landscaping should be conducted on quantitative estimations in 3 aspects, i.e., follow strategies of ecological landscaping, improve water quality treatment techniques, and apply attention restoration theory. With deeper comprehension of SBIs, practical design, management, and maintenance of urban constructed WQT wetlands will be optimised.