Arid Zone Research ›› 2024, Vol. 41 ›› Issue (1): 50-59.doi: 10.13866/j.azr.2024.01.05

• Land and Water Resources • Previous Articles     Next Articles

Evaluation of the environmental quality of surface water in Chengde using improved methods

ZHANG Sheng1(),ZHANG Tao1,DUAN Wenyu2,XU Li1,3,Gu Jinyang1,ZHANG Wei1,LI Simin1()   

  1. 1. Hebei Technology Innovation Center for Water Pollution Control and Water Ecological Remediation, Hebei Engineering Research Center of Sewage Treatment and Resource Utilization, Handan Key Laboratory of Water Utilization Technology, Institute of Water Conservancy and Hydro-Electric Power, Hebei University of Engineering, Handan 056038, Hebei, China
    2. Zhangjiakou Meteorological Bureau, Zhangjiakou 075000, Hebei, China
    3. Department of Municipal and Environmental Engineering, Hebei University of Architecture, Zhangjiakou 075000, Hebei, China
  • Received:2023-08-21 Revised:2023-10-30 Online:2024-01-15 Published:2024-01-24

Abstract:

To objectively reflect the surface water quality status, a combination of the Analytic Hierarchy Process Entropy Weight Method and the weighted average comprehensive evaluation principle were used to improve the fuzzy comprehensive evaluation method. The method was compared with the single factor evaluation, Nemero index, and traditional undefined extensive evaluation methods to evaluate the surface water environmental quality in the Chengde area in 2021. The results showed a significant spatiotemporal difference in the surface water quality. Except for some sections with poor water quality from July to September, the water quality in other sections was in Classes I-III; The main factors affecting surface water quality in the Chengde area were CODMn and TP; The single factor evaluation and the Nemero index methods could not reflect the overall water quality. Compared to the traditional fuzzy comprehensive evaluation method, the improved fuzzy comprehensive evaluation method considers the interaction between various pollution factors and weakened the impact of individual water quality indicators on the evaluation results. It can also rank the category of water quality, making it more suitable for evaluating the environmental quality of surface water in the Chengde area.

Key words: water quality evaluation, improved fuzzy comprehensive evaluation method, analytic hierarchy process, entropy weight method, Chengde area