Water Level Decline in a Reservoir: Implications for Water Quality Variation and Pollution Source Identification
Open Access
- 1 April 2020
- journal article
- research article
- Published by MDPI AG in International Journal of Environmental Research and Public Health
- Vol. 17 (7), 2400
- https://doi.org/10.3390/ijerph17072400
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, NH4-N, Fe and CODMn 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.Funding Information
- National Natural Science Foundation of China (51809032)
This publication has 47 references indexed in Scilit:
- Study on the simulation of nutrient release from river inner source and its application-a case study of Guangzhou-Foshan river network, ChinaProcedia Environmental Sciences, 2010
- Clustering and forecasting of dissolved oxygen concentration on a river basinStochastic Environmental Research and Risk Assessment, 2010
- Living with dams: managing the environmental impactsWater Policy, 2009
- Spatial analysis of water quality trends in the Han River basin, South KoreaWater Research, 2008
- Detrended Cross-Correlation Analysis: A New Method for Analyzing Two Nonstationary Time SeriesPhysical Review Letters, 2008
- Flood frequency in China's Poyang Lake region: trends and teleconnectionsInternational Journal of Climatology, 2006
- Recent advances in wavelet analyses: Part 1. A review of conceptsJournal of Hydrology, 2005
- Use of Computer-Assisted Methods for the Modeling of the Retention Time of a Variety of Volatile Organic Compounds: A PCA-MLR-ANN ApproachJournal of Chemical Information and Computer Sciences, 2004
- Application of Morlet wavelets to supervise power system disturbancesIEEE Transactions on Power Delivery, 1999
- Electronegativity-equalization method for the calculation of atomic charges in moleculesJournal of the American Chemical Society, 1986