2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/24/2021 | 8:30 AM - 10:30 AM | CONCENTRATION - DISCHARGE (C-Q) RELATIONSHIPS IS A USEFUL TOOL FOR QUANTIFYING PHOSPHORUS EXPORT DYNAMICS IN GREATER EVERGLADES ECOSYSTEM CANALS | Virtual Platform
CONCENTRATION - DISCHARGE (C-Q) RELATIONSHIPS IS A USEFUL TOOL FOR QUANTIFYING PHOSPHORUS EXPORT DYNAMICS IN GREATER EVERGLADES ECOSYSTEM CANALS
Concentration–discharge (C-Q) relationships were applied to the manmade and regulated canals of the Greater Everglades Ecosystem, to understand phosphorus (P) export dynamics. Twenty-five years of discharge and P data were obtained from three canal monitoring stations (S5a, S39 and S9) that respectively drain agricultural, wetland and urban basins. C-Q relationship for P shows slight positive relationships with discharge for the three canals. Piecewise regressions reveal the presence of threshold behaviors (inflections in C-Q slopes) at S5a and S9, which indicate different P dynamics at low and high flows. During low flows, there are no significant relationships (chemostasis) between concentration and discharge. This means non-hydrologic factors (e.g. biogeochemical processes) dominate the export of P. However, at high flows, there are positive slopes which suggest that higher discharges cause enrichment in P concentrations. An explanation is that higher discharges can mobilize and transport P through entrainment of particulate P from canal bed sediments, desorption of P from suspended particles, and release of pore water P. The ability to determine discharge thresholds above which there can be an increase in P export makes C-Q relationships a crucial management tool for Everglades restoration.
- Transport
- Nutrients
- Models
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Presenters/Authors
Ikechukwu Onwuka
(), Florida International University, ionwu002@fiu.edu;
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