Impact of stormwater inflow on water quality of stratified source reservoir
LÜ Xiao-long, HUANG Ting-lin, LI Nan, XU Jin-lan, DENG Li-fan, MAO Xue-jing
Shaanxi Key Laboratory of Environmental Engineering, Ministry of Education, Key Laboratory of Northwest Water Resources and Environment, Xi'an University of Architecture and Technology, Xi'an 710055, China
To explore the intrusion processes of the density current and its influences on water quality in rainfall events, water temperature, dissolved oxygen, turbidity and related contaminants were monitored in June 2015 and October 2017. 11 monitoring sections were set along the upstream to main basin in Jinpen Reservoir (JPR). The underflow plunged into reservoir undergoes three stages when the inflow was 300~400m3/s:whole-section intrusion with greater water velocity, bottom intrusion with high density and mid-intrusion due to sedimentation of slit. The underflow caused the loss of thermal stability of water column, while the dissolved oxygen in the middle and lower water column were supplemented. Quantities of slit with underflow containing organic matters, nutrients and inorganic substances were transformed into reservoir and the concentration of total nitrogen, total phosphorus, turbidity and other index were resultantly increased in water column. For example, in June 2015, TN, TP, CODMn and turbidity were increased from 1.60, 0.021, 3.70mg/L and 5NTU to 2.37, 0.100, 5.80mg/L and 93NTU, respectively.
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LÜ Xiao-long, HUANG Ting-lin, LI Nan, XU Jin-lan, DENG Li-fan, MAO Xue-jing. Impact of stormwater inflow on water quality of stratified source reservoir. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(7): 3064-3072.
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