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Continuous Instream Monitoring of Nutrients and Sediment in Agricultural Watersheds
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Where rivers jump course.

Sam Brooke1, Austin J Chadwick2, Jose Silvestre3

  • 1Department of Geography, University of California Santa Barbara, Santa Barbara, CA, USA.

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Summary
This summary is machine-generated.

River avulsions, which cause floods, are poorly understood. This study analyzed 113 global avulsions over 50 years, identifying key controls on their locations and improving flood hazard prediction.

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Area of Science:

  • Fluvial geomorphology
  • Hydrology
  • Remote sensing applications

Background:

  • River avulsions are abrupt channel shifts causing significant floods.
  • Understanding avulsion controls is crucial for hazard assessment but limited by sparse data.

Purpose of the Study:

  • To identify and characterize the primary controls on river avulsion locations globally.
  • To enhance the understanding of factors influencing flood hazards.

Main Methods:

  • Analysis of nearly 50 years of global satellite imagery.
  • Documentation and spatial analysis of 113 river avulsion events.
  • Correlation of avulsion locations with geomorphological features and hydrological conditions.

Main Results:

  • Three distinct controls on avulsion location were identified: valley confinement changes on fans, and flow dynamics (deceleration/acceleration) within the backwater zone on deltas.
  • A significant portion (38%) of delta avulsions occurred upstream of backwater zones, linked to steep, sediment-rich rivers in arid and tropical environments.
  • Upstream flood-driven erosion, extending beyond backwater effects in specific river types, dictates avulsion location in these cases.

Conclusions:

  • Avulsion locations are governed by a combination of geomorphological setting and flood dynamics.
  • Steep, sediment-rich rivers exhibit unique avulsion behavior extending beyond typical backwater influences.
  • Findings provide critical insights into how river avulsion hazards may evolve with changing land use and climate.