Phosphorus dynamics across intensively monitored subcatchments in the Beaver River
| Autor: | S. K. Oni, David T Woods, Eavan M. O'Connor, Paul Whitehead, Jill Crossman, Li Jin, Martyn N. Futter, Dan Butterfield, Peter J. Dillon, Lance P Aspden, Helen M. Baulch |
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| Rok vydání: | 2013 |
| Předmět: | |
| Zdroj: | Inland Waters. 3:187-206 |
| ISSN: | 2044-205X 2044-2041 |
| DOI: | 10.5268/iw-3.2.530 |
| Popis: | We report results from a spatially intensive monitoring and modelling study to assess phosphorus (P) dynamics in the Beaver River, a tributary of Lake Simcoe, Ontario. We established multiple monitoring stations (9 flow and 24 water quality stations) from headwaters to near the outflow that were operated for 2 field seasons, complementing longer term data from a flow monitoring site and water chemistry monitoring site. We applied the Branched-INCA-P model, which allows fully distributed simulations supported by highly distributed monitoring data. Using spatially distributed data helped better understand variable P and sediment dynamics across the catchment and identify key model uncertainties and uncertainties related to catchment P management. Measured and modelled total P concentrations often exceeded provisional water quality thresholds in many areas of the catchment and highlight the value of studying water quality across multiple subcatchments rather than at a single site. Total P export coefficients differed widely among subcatchments, ranging from 2.1–21.4 kg km -2 y -1 over a single year. Export coefficients were most strongly (negatively) related to the proportion of wetland cover in subcatchments. The INCA-P model captured spatial variation in P concentrations relatively well, but short-term temporal variability in the observed data was not well simulated across sites, in part due to unmodelled hydrological phenomena including beaver activity and unknown drivers of P peaks that were not associated with hydrological events. |
| Databáze: | OpenAIRE |
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