INFLUENCE OF WATER LEVEL DESCENDING OF LAYERED RESERVOIRS ON WATER QUALITY CHARACTERISTICS IN SOUTH CHINA

LIU Sixuan; LI Yiping; ZHU Ya; WEI Yao; LI Ronghui; WANG Can; CHEN Yu; PENG Yanli; LIANG Dan

doi:10.13205/j.hjgc.202305024

Volume 41 Issue 5

May 2023

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LIU Sixuan, LI Yiping, ZHU Ya, WEI Yao, LI Ronghui, WANG Can, CHEN Yu, PENG Yanli, LIANG Dan. INFLUENCE OF WATER LEVEL DESCENDING OF LAYERED RESERVOIRS ON WATER QUALITY CHARACTERISTICS IN SOUTH CHINA[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(5): 179-186,194. doi: 10.13205/j.hjgc.202305024

Citation:

LIU Sixuan, LI Yiping, ZHU Ya, WEI Yao, LI Ronghui, WANG Can, CHEN Yu, PENG Yanli, LIANG Dan. INFLUENCE OF WATER LEVEL DESCENDING OF LAYERED RESERVOIRS ON WATER QUALITY CHARACTERISTICS IN SOUTH CHINA[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(5): 179-186,194. doi: 10.13205/j.hjgc.202305024

Citation:

LIU Sixuan, LI Yiping, ZHU Ya, WEI Yao, LI Ronghui, WANG Can, CHEN Yu, PENG Yanli, LIANG Dan. INFLUENCE OF WATER LEVEL DESCENDING OF LAYERED RESERVOIRS ON WATER QUALITY CHARACTERISTICS IN SOUTH CHINA[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(5): 179-186,194. doi: 10.13205/j.hjgc.202305024

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INFLUENCE OF WATER LEVEL DESCENDING OF LAYERED RESERVOIRS ON WATER QUALITY CHARACTERISTICS IN SOUTH CHINA

doi: 10.13205/j.hjgc.202305024

LIU Sixuan¹,
LI Yiping^{1,2
,
,},
ZHU Ya¹,
WEI Yao¹,
LI Ronghui³,
WANG Can¹,
CHEN Yu¹,
PENG Yanli⁴,
LIANG Dan⁴

1. College of Environment, Hohai University, Nanjing 210098, China;
2. Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, Hohai University, Nanjing 210098, China;
3. Guangxi Water Conservancy Science Research Institute, Nanning 530023, China;
4. Guangxi Vocational College of Water Resources and Electric Power, Nanning 530023, China

Received Date: 2022-04-30

Abstract

Abstract

In recent years, the water level of reservoirs in Guangxi continued to decline. Water quality problems caused by the sudden blackening phenomenon attracted widespread attention. In order to explore the migration and transformation law of iron, manganese and sulfide under the low water level, we comprehensively investigated and analyzed meteorological, hydrological, and water quality data from 2018 to 2021 and continuous sampling data during the low water level period. The results showed that long-term inflow led to a decrease in the reservoir storage capacity. Water level fluctuation was mainly affected by low-frequency and low-volume rainfall. The average dissolved oxygen concentration of the bottom water in the thermal stratification period was 1.79 mg/L when the water depth descended to about 11 meters. Mixing depth of low water level area was closely related to completely mixed. Further analysis results indicate that the water level declining promoted the increase of Fe and Mn concentrations (4.28 mg/L and 5.41 mg/L), reaching 3.67, 3.68 times that of 2018. Horizontal physical and chemical property differences and the migration of pollutants occurred by thermal stratification led to the deterioration of water quality. In general, the blackening phenomenon presented regional differences. Seasonal alternation of the mixing period and stratification period is the driving factor for the accumulation, migration and transformation of Fe and Mn.
- low water level,
- dissolved oxygen,
- transverse law,
- iron,
- manganese

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References(28)

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