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Groundwater discharge of legacy nitrogen at the scale of river networks: Where do stream interface sediments act as conduits or filters?

Summary

Reactive nitrogen (N) applied to land surfaces accumulates in aquifers, creating a source of legacy N that is later discharged from ground to surface waters. Focused groundwater discharges (preferential seepages) can act as legacy N point-sources and confound surface water quality management strategies that are based on reducing contemporary N application and sewage treatment discharges. Predicting the timing, magnitude, and spatial distribution of legacy N delivery to surface waters is complex because it is determined by both transport and processing along regional-scale groundwater flow paths and the local-scale reactivity of stream interface sediments at the terminal end of long groundwater flow paths. The overall objective of the [...]

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“Infrared image of a riverbank preferential groundwater discharge zone.”
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Infrared image of a riverbank preferential groundwater discharge zone.
Infrared image of a riverbank preferential groundwater discharge zone.

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