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Water Level Decline in a Reservoir: Implications for Water Quality Variation and Pollution Source Identification

Author

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  • Zixiong Wang

    (China Water Resources Pearl River Planning Surveying & Designing Co, Ltd., Guangzhou 510610, China
    School of Engineering, Anhui Agricultural University, Hefei 230036, China)

  • Tianxiang Wang

    (China Water Resources Pearl River Planning Surveying & Designing Co, Ltd., Guangzhou 510610, China
    Dalian University of Technology, Institution of Water and Environment Research, Dalian 116024, China
    Huaiyin Institute of Technology, Jiangsu Smart Factory Engineering Research Center, Huaian 223003, China)

  • Xiaoli Liu

    (School of Engineering, Anhui Agricultural University, Hefei 230036, China)

  • Suduan Hu

    (Dalian University of Technology, Institution of Water and Environment Research, Dalian 116024, China)

  • Lingxiao Ma

    (Dalian University of Technology, Institution of Water and Environment Research, Dalian 116024, China)

  • Xinguo Sun

    (Huaiyin Institute of Technology, Jiangsu Smart Factory Engineering Research Center, Huaian 223003, China)

Abstract

Continuous water-level decline makes the changes of water quality in reservoirs more complicated. This paper uses trend analyses, wavelet analysis and principal component analysis-multiple linear regression to explore the changes and pollution sources affecting water quality during a period of continuous reservoir water level decline (from 65.37 m to 54.15 m), taking the Biliuhe reservoir as an example. The results showed that the change of water level of Biliuhe reservoir has a significant 13-year periodicity. The unusual water quality changes during the low water level period were as follows: total nitrogen continued to decrease. And iron was lower than its historical level. pH, total phosphorus, and ammonia nitrogen were higher than historical levels and fluctuated seasonally. Permanganate index increased as water level decreased after initial fluctuations. Dissolved oxygen was characterized by high content in winter and relatively low content in summer. The pollutant sources of non-point source pollution (PC1), sediment and groundwater pollution (PC2), atmospheric and production & domestic sewage (PC3), other sources of pollution (PC4) were identified. The main source of DO, pH, TP, TN, NH 4 -N, Fe and COD Mn were respectively PC3 (42.13%), PC1 (47.67%), PC3 (47.62%), PC1 (29.75%), PC2 (47.01%), PC1 (56.97%) and PC2 (50%). It is concluded that the continuous decline of water level has a significant impact on the changes and pollution sources affecting water quality. Detailed experiments focusing on sediment pollution release flux, and biological action will be explored next.

Suggested Citation

  • Zixiong Wang & Tianxiang Wang & Xiaoli Liu & Suduan Hu & Lingxiao Ma & Xinguo Sun, 2020. "Water Level Decline in a Reservoir: Implications for Water Quality Variation and Pollution Source Identification," IJERPH, MDPI, vol. 17(7), pages 1-18, April.
    • Handle: RePEc:gam:jijerp:v:17:y:2020:i:7:p:2400-:d:339933
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    References listed on IDEAS

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    1. GuoLiang Wei & ZhiFeng Yang & BaoShan Cui & Bing Li & He Chen & JunHong Bai & ShiKui Dong, 2009. "Impact of Dam Construction on Water Quality and Water Self-Purification Capacity of the Lancang River, China," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 23(9), pages 1763-1780, July.
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    1. Guoshuai Qin & Jianwei Liu & Shiguo Xu & Ya Sun, 2021. "Pollution Source Apportionment and Water Quality Risk Evaluation of a Drinking Water Reservoir during Flood Seasons," IJERPH, MDPI, vol. 18(4), pages 1-17, February.

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