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| Water environmental risk assessment across different periods in the Henan section of the Wei River basin |
| Received:October 09, 2022 Revised:January 10, 2023 |
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| KeyWord:Wei River basin;Henan;Copula function;water pollutant;environmental risk assessment |
| Author Name | Affiliation | E-mail | | ZHANG Yan | Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang 453002, China
School of Water Conservancy and Civil Engineering, Zhengzhou University, Zhengzhou 450001, China | | | ZOU Lei | Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China | | | DOU Ming | School of Water Conservancy and Civil Engineering, Zhengzhou University, Zhengzhou 450001, China
School of Ecology and Environment, Zhengzhou University, Zhengzhou 450001, China | dou_ming@163.com | | LI Ping | Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang 453002, China
Laboratory of Quality and Safety Risk Assessment for Agro-Products on Water Environmental Factors, Ministry of Agriculture and Rural Affairs, Xinxiang 453002, China | | | LIANG Zhijie | Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang 453002, China | |
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| Abstract: |
| In order to evaluate the water environmental risk in the Henan section of the Wei River basin across different periods, monitoring data on three kinds of water quality indicators[chemical oxygen demand(COD), ammonia nitrogen(NH3-N) and total phosphorus(TP)] were selected at four monitoring sections. The appropriate three-dimensional joint risk probability distribution model of water pollutants was constructed by establishing the marginal distribution function and the optimal Copula function, and the combined risk probability of water pollutants in different periods was analyzed. The results showed that the Gaussian Copula function was the best three-dimensional Copula function for the water pollutants in the monitoring sections of Weihui Huangfu(non-flood season and flood season), Xunxian Wangwan(non-flood season) and Daming Longwangmiao(non-flood season and flood season), and t Copula function were the best three dimensional Copula function for the water pollutants at Xunxian Wangwan(flood season) and Tangyin Wuling(non-flood season and flood season). The maximum joint probabilities were respectively 26.30% and 21.61% in non-flood season and flood season at Daming Longwangmiao when the water pollutants were in the Ⅰ-Ⅲ water quality standard, while the maximum joint risk probabilities were 52.34% and 56.53% in non-flood season and flood season at Weihui Huangfu when at least one index of the water pollutants was in the inferior Ⅴ water quality standard. The joint risk probabilities of the water pollutants in non-flood season were 25.68%, 22.94%, 24.68% and 13.47% at Weihui Huangfu, Xunxian Wangwan, Tangyin Wuling and Daming Longwangmiao, respectively when only NH3-N was under the quality standard of inferior Ⅴ, while the joint risk probabilities of the water pollutants in flood season were 28.01%, 10.31%, 6.16% and 4.12%, respectively. The monitoring sections of Weihui Huangfu and Xunxian Wangwan were mainly affected by industrial wastewater and domestic sewage pollution during the non-flood and flood seasons, and the dominant water pollutant was NH3-N. The monitoring sections of Tangyin Wuling and Daming Longwangmiao were mainly affected by agricultural non-point sources of pollution during the flood season, and the dominant water pollutant changed from NH3-N during the non-flood season to TP in flood season. The joint risk probabilities of water pollutants in the Henan section of the Wei River basin were different in different periods. |
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