11:05 AM - 11:20 AM
[AHW20-10] Differences in nitrogen biogeochemical cycles of a reservoir with a hydraulic retention time of several days, before and after the dam was built
Keywords:Nitrogen, Environmental fluid dynamics code, Suofengying Reservoir
Despite the fragmentation of rivers and irreparable damage to biodiversity, around the world, more and more DAMS are being built to alleviate energy, water, and food shortages. The retention time of these reservoirs varies from a few days to several years. Suofengying Reservoir ((26° 94’N, 106° 35’E, 70 m of depth) in Wujiang River Watershed of China was selected. The dam was built and put into use in 2004, mainly for power generation, with a hydraulic retention time of 0.012 years. It made the reservoir change a little vertically, which interacts with aquaculture. On the one hand, the proportion of fish prefers rapid water or still water. On the other hand, a large number of nutrients are input, etc.
In this abstract, I used environmental fluid dynamics code, ArcGIS, water balance model, mass balance model, and box model to build the reservoir hydrodynamic model, water quality model of nitrogen. I discussed 1) The dam's interdicting effect on the river is interpreted in combination with atmospheric nitrogen deposition, sediment-water interface release, and settlement. Because of the hydrodynamic defense, nitrogen cycle differences occur in the river, mixing zones, and still water zones. 2) The effects of other biogenic elements, especially P limitation, on nitrogen bioavailability. 3) Interaction of the whole system of atmosphere, surface water, groundwater, soil, sediment, and organisms.
Special thanks to China National Meteorological Data Center (https://data.cma.cn/), Watershed Biogeochemistry Team, School of Earth System Science, Tianjin University, School of Environment and Chemistry, Shanghai University, and State Key Laboratory of Environmental and Chemical Engineering, Institute of Geochemistry, Chinese Academy of Sciences, Guizhou Hydrological Resources Bureau and DSI LLC. for their foundation work.
In this abstract, I used environmental fluid dynamics code, ArcGIS, water balance model, mass balance model, and box model to build the reservoir hydrodynamic model, water quality model of nitrogen. I discussed 1) The dam's interdicting effect on the river is interpreted in combination with atmospheric nitrogen deposition, sediment-water interface release, and settlement. Because of the hydrodynamic defense, nitrogen cycle differences occur in the river, mixing zones, and still water zones. 2) The effects of other biogenic elements, especially P limitation, on nitrogen bioavailability. 3) Interaction of the whole system of atmosphere, surface water, groundwater, soil, sediment, and organisms.
Special thanks to China National Meteorological Data Center (https://data.cma.cn/), Watershed Biogeochemistry Team, School of Earth System Science, Tianjin University, School of Environment and Chemistry, Shanghai University, and State Key Laboratory of Environmental and Chemical Engineering, Institute of Geochemistry, Chinese Academy of Sciences, Guizhou Hydrological Resources Bureau and DSI LLC. for their foundation work.