| Autor: |
Vyn, Dillon, Robinson, Clare E., Goel, Pradeep, Shah, Imtiaz, Jivani, Sabrina |
| Předmět: |
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| Zdroj: |
Annual Conference on Great Lakes Research Abstract Book; 2023, Vol. 66, p217-217, 1/3p |
| Abstrakt: |
The relative contribution of phosphorus (P) from different urban land use types and its seasonal variations is not well understood, especially for cold climates. Further, the effectiveness of stormwater control measures (SCMs) in reducing P loads are poorly quantified at the subwatershed scale. To address these gaps, detailed monitoring of concentrations and loads of total suspended solids (TSS), total P (TP), soluble reactive P (SRP), and nitrate (as NO3-N) was conducted over a 15-month period in an urban subwatershed in London, ON. Monitoring locations were set up at outlets of different urban land use types and across different SCMs. Grab samples were collected during rain, snowmelt, and baseflow conditions, and autosamplers were deployed at downstream sites during precipitation events. The highest SRP concentrations were observed during large late winter snowmelt events and large fall rain events. TP and TSS concentrations were highly variable during events with TP often considerably larger than SRP. SRP concentrations were consistently highest at the outlet of an older low-density residential area compared to other land uses, with construction also contributing to high outlier SRP concentrations. Finally, while the traditional wet pond significantly decreased SRP concentrations, the monitored swales and bioretention systems had no significant influence on SRP concentrations. Study findings will assist in predictions of P loads from cold climate urban areas and aid decisions for reducing nonpoint source urban P loads. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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