Evaluation of Groundwater Using an Integrated Approach of Entropy Weight and Stochastic Simulation: A Case Study in East Region of Beijing

International Journal of Environmental Research and Public Health

Ruitao Jia¹  Huaqing Wang¹  Yongxiang Zhang¹  Zhuoran Luo¹  Jin Wu¹ 

[1] Faculty of Architecture, Civil and Transportation Engineering, Beijing University of Technology, Beijing 100124, China;

关键词: groundwater quality;    IWQI;    hydrochemistry;    sensitivity analysis;    Chaoyang district;   

DOI  :  10.3390/ijerph18147703

来源: DOAJ

【 摘 要 】

Groundwater is an important source of water in Beijing. Hydrochemical composition and water quality are the key factors to determine the availability of groundwater. Therefore, an improved integrated weight water quality index approach (IWQI) combining the entropy weight method and the stochastic simulation method is proposed. Through systematic investigation of groundwater chemical composition in different periods, using a hydrogeochemical diagram, multivariate statistics and spatial interpolation analysis, the spatial evolution characteristics and genetic mechanism of groundwater chemistry are discussed. The results show that the groundwater in the study area is weakly alkaline and low mineralized water. The south part of the study area showed higher concentrations of total dissolved solids, total hardness and ${\mathrm{NO}}_3^{-}$-N in the dry season and wet season, and the main hydrochemical types are ${\mathrm{HCO}}_3^{-}$-Ca and ${\mathrm{HCO}}_3^{-}$-Ca-Mg. The natural source mechanism of the groundwater chemical components in Chaoyang District includes rock weathering, dissolution and cation exchange, while the human-made sources are mainly residents and industrial activities. Improved IWQI evaluation results indicate that water quality decreases from southwest to northeast along groundwater flow path. The water quality index (WQI) method cannot reflect the trend of groundwater. Sensitivity analysis indicated that the improved IWQI method could describe the overall water quality reliably, accurately and stably.

【 授权许可】

Unknown