2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
6/06/2017 | 11:30 AM - 11:45 AM | HOW RIVER NETWORK STRUCTURE AFFECTS NITROGEN REMOVAL AND EXPORT | 302B
HOW RIVER NETWORK STRUCTURE AFFECTS NITROGEN REMOVAL AND EXPORT
Streams and rivers play an important role in watershed nitrogen (N) dynamics. We explore how river network structure – the spatial arrangement of tributaries – may affect N removal and export at the watershed-scale. To represent network structure, we derived Optimal Channel Networks (OCNs) with identical watershed areas and stream densities but varying watershed shapes (i.e., with maximum flow path lengths of 140, 72, and 50 km). For each OCN, we implemented a published N model based on extensive N removal measurements for scenarios spanning a wide range of catchment N loading rates (incoming concentrations from 0.15 µg N L-1 to 150 mg N l-1). Similar to previous findings, the fraction of N removed decreased with increasing N loading for all networks. The networks removed similar fractions of N load for both low and high loading scenarios. However, elongated networks removed a substantially higher fraction of N load for intermediate loading scenarios. Watershed shape was also related to the role of large streams in whole-network N removal. Additional model scenarios will explore interactions between network structure, stream density, and heterogeneous N loading.
- C10 Biogeochemistry
- C27 Landuse and Non-Point source Impacts
- S29 Macrosystem Ecology of Aquatic Systems
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Presenters/Authors
Ashley Helton
(), University of Connecticut, ashley.helton@uconn.edu;
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Robert O. Hall
(), Flathead Lake Biological Station, University of Montana, bob.hall@flbs.umt.edu;
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Enrico Bertuzzo
(), University Cà Foscari Venice, enrico.bertuzzo@unive.it;
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