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Variability of flowing stream network length across the US
Jeff P Prancevic1,2, Hansjörg Seybold2, James W Kirchner1,2,3
1Department of Earth & Planetary Science, University of California, Berkeley, Berkeley, CA, USA.
Science (New York, N.Y.)
|February 13, 2025
Summary
Stream networks expand and contract with landscape wetness. Across the US, median stream networks are five times longer during high-flow periods than low-flow periods, revealing significant hydrological variability.
Area of Science:
- Hydrology
- Geomorphology
- Environmental Science
Background:
- Stream network dynamics are crucial for understanding hydrological processes.
- Previous studies on stream network variability were limited to small drainage basins.
- Landscape wetness significantly influences the aggregate length of flowing streams.
Purpose of the Study:
- To estimate stream network length variability across a large geographic area.
- To quantify the relationship between landscape wetness and stream network extent.
- To identify regional differences in stream network dynamics.
Main Methods:
- Utilized streamflow data from 14,765 gauged basins in the contiguous United States.
- Employed topography-based methods to estimate network elasticity (sensitivity to wetness).
- Integrated streamflow distributions with network elasticity to model stream network length.
Main Results:
- The median US stream network was found to be five times longer during annual high-flow conditions compared to annual low-flow conditions.
- Significant regional variations in stream network dynamics were observed across the US.
- Hydroclimatology and network elasticity were identified as key drivers of regional differences.
Conclusions:
- Stream networks exhibit substantial length variability in response to changing hydrological conditions.
- Regional hydroclimatic factors and landscape characteristics modulate stream network dynamics.
- Findings provide a national-scale perspective on stream network responsiveness to climate variability.
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