2022 Early Hearing Detection & Intervention Virtual Conference

March 13 - 15, 2022

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5/21/2018 | 11:45 AM - 12:00 PM | MULTI-YEAR TRENDS IN SOLUTE CONCENTRATIONS AND FLUXES FROM A SUBURBAN WATERSHED: EVALUATING EFFECTS OF 100-YEAR FLOOD EVENTS | 330 B

MULTI-YEAR TRENDS IN SOLUTE CONCENTRATIONS AND FLUXES FROM A SUBURBAN WATERSHED: EVALUATING EFFECTS OF 100-YEAR FLOOD EVENTS

Anthropogenic activities have increased solute concentrations and fluxes in rivers, contributed by changes in atmospheric deposition, road salt and fertilizer application, and urbanization. Extreme flood events, which are increasing in frequency, could alter river chemistry by flushing various solute reservoirs within the watershed. We evaluated changes in the concentrations and fluxes of inorganic nutrients, dissolved organic matter, and salts and major ions across a 12 to 15 year period that included two 100-year flood events. Over 12 to 15 year periods, concentrations and fluxes of sodium and chloride, fluxes of all other salts, and concentrations of dissolved organic carbon declined in our urbanizing watershed. Nitrate and DON appeared to be highly responsive to extreme flooding. Increasing trends in nitrate concentrations stabilized after the flood events. The concentration-discharge behavior of nitrate shifted from enrichment in the years prior to and including the floods to chemostasis after the floods. The capacity of large flood events to remove accumulated solutes within human-impacted watersheds has important implications for watershed management, and our results demonstrate an important role of extreme events in the biogeochemistry of urbanizing watersheds.

Flood
Temporal
Water Quality

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Presenters/Authors

Ashley Coble (), National Council for Air and Stream Improvement, Inc., acoble@ncasi.org;