2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/25/2021 | 8:30 AM - 10:30 AM | NUTRIENT FLUX AT THE SEDIMENT-WATER INTERFACE IN URBAN RIVER IN LONDON AND BEIJING | Virtual Platform
NUTRIENT FLUX AT THE SEDIMENT-WATER INTERFACE IN URBAN RIVER IN LONDON AND BEIJING
Uptake and regeneration of nitrate, ammonium, phosphate and dissolved organic carbon (DOC) at the sediment-water interface were evaluated at urban river sites in London and Beijing. London sites were located above and below a wastewater outfall, while Beijing sites encompassed a range of urban settings; together these sites provided a template to investigate a wide range of urban stressors. Using chamber techniques, water-specific nutrient concentrations were measured at 2 exposures (3 and 10 minutes) to calculate flux. Across all sites uptake and regeneration were found. For London, NO3- was -0.01 to +0.02 mg/(m2•s), NH4+ was -29 to +2 µg/(m2•s), PO43- was -2.0 to +0.5 µg/(m2•s), and DOC was -0.01 to +0.05 mg/(m2•s). For Beijing, NO3- was -0.40 to +0.21 mg/(m2•s), NH4+ was -2 to +20 µg/(m2•s), PO43- was -120 to +240 µg/(m2•s), and DOC was -0.02 to +0.22 mg/(m2•s). These results provide a baseline to investigate how urban stressors (e.g., pollution and elevated temperatures) affect nutrient flux. Our work illustrates how urban river conditions can affect the retention or release of nutrients, increasing the risks of eutrophication to downstream waterbodies.
- Monitoring
- Nutrients
- Stressor
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Presenters/Authors
Meng Zhang
(), meng.zhang@kcl.ac.uk;
ASHA DISCLOSURE:
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Nonfinancial -
Michael Chadwick
(), King's College London, michael.chadwick@kcl.ac.uk;
ASHA DISCLOSURE:
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Nonfinancial -