EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021
(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)
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
Presentation:
This presentation has not yet been uploaded.
Handouts:
Handout is not Available
Transcripts:
CART transcripts are NOT YET available, but will be posted shortly after the conference
Presenters/Authors
Ashley Helton
(), University of Connecticut, ashley.helton@uconn.edu;
ASHA DISCLOSURE:
Financial -
Nonfinancial -
Robert O. Hall
(), Flathead Lake Biological Station, University of Montana, bob.hall@flbs.umt.edu;
ASHA DISCLOSURE:
Financial -
Nonfinancial -
Enrico Bertuzzo
(), University Cà Foscari Venice, enrico.bertuzzo@unive.it;
ASHA DISCLOSURE:
Financial -
Nonfinancial -