2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
6/06/2017 | 11:45 AM - 12:00 PM | Aquatic nitrate retention at river network scales across flow conditions determined using nested in situ sensors | 302B
Aquatic nitrate retention at river network scales across flow conditions determined using nested in situ sensors
Non-point pollution sources are strongly influenced by hydrology and are therefore sensitive to climate variability. Some pollutants entering aquatic ecosystems such as nitrate can be mitigated by in stream processes during transport through the river network. Whole river network nitrate retention is difficult to quantify with observations. High frequency, in situ nitrate sensors, deployed in nested locations within a single watershed, can improve estimates of both non-point inputs and aquatic retention at river network scales. We deployed a nested sensor network in the urbanizing Oyster River watershed in coastal New Hampshire, USA, to quantify storm event scale loading and network scale retention. In the headwater streams, nitrate and chloride concentrations both diluted more with increasing storm size. At the mouth of the watershed, chloride also diluted, but nitrate tended to increase. Nitrate to chloride flux ratios indicate this pattern is due to high nitrate retention during small storms that declines during large storms. Nested sensor networks can improve understanding of the controls of both loading and network scale retention, and therefore also improve management of non-point source pollution.
- S24 Towards a predictive freshwater ecology: using time-series data to understand and forecast responses to a changing environment
- C10 Biogeochemistry
- S29 Macrosystem Ecology of Aquatic Systems
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Presenters/Authors
Wilfred Wollheim
(), University of New Hampshire, wil.wollheim@unh.edu;
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Gopal Mulukutla
(), University of New Hampshire, gopal.mulukutla@unh.edu;
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Christopher Cook
(), University of New Hampshire , christopher.cook@unh.edu;
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Richard Carey
(), University of New Hampshire, richard.carey@unh.edu;
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