2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/24/2018 | 2:30 PM - 2:45 PM | YESTERDAY IS HISTORY, TOMORROW IS A MYSTERY: QUANTIFICATION OF LONG-TERM NUTRIENT LEGACIES IN HUMAN-IMPACTED WATERSHEDS | 330 B
YESTERDAY IS HISTORY, TOMORROW IS A MYSTERY: QUANTIFICATION OF LONG-TERM NUTRIENT LEGACIES IN HUMAN-IMPACTED WATERSHEDS
Nutrient inputs to human-impacted watersheds have more than doubled over the last century in response to population growth and intensive agricultural practices. Although mass balance studies consistently show N and P inputs exceeding outputs in human-impacted areas, the forms and relative magnitudes of legacy N and P accumulation are still not well understood. In the present work, we have developed a parsimonious, process-based model, ELEMeNT, that brings together soil N and P dynamics, erosion processes for simulation of surface P transport and a travel time-based approach for simulation of transport and retention along subsurface pathways. Using more than 100-year trajectories of nutrient inputs to watersheds across the US and Canada, we have not only reconstructed total nutrient yields at watershed outlets, but also estimate magnitudes of N and P accumulation along surface and subsurface pathways. As both inland and coastal waters continue to be impacted by eutrophication events, even after significant improvements in nutrient management practices, such estimates of legacy nutrient accumulation are crucial to setting realistic targets for reducing nutrient loading.
- Landuse
- Watershed
- Water Quality
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Presenters/Authors
Nandita Basu
(), University of Waterloo, nandita.basu@uwaterloo.ca;
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Kimberly Van Meter
(), University of Illinois at Chicago, kvanmete@uic.edu;
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Philippe Van Cappellen
(), University of Waterloo, pvc@uwaterloo.ca;
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