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Rapidly varying flow (RVF) in open channels is characterized by abrupt changes in flow depth over a short distance, with the rate of depth change relative to distance often approaching unity. These flows are inherently complex due to their transient and multi-dimensional nature, making exact analysis difficult. However, approximate solutions using simplified models provide valuable insights into their behavior.Key Features of Rapidly Varying FlowRVF is commonly observed in scenarios involving...
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Recent changes to Arctic river discharge.

Dongmei Feng1, Colin J Gleason2, Peirong Lin3

  • 1Department of Civil and Environmental Engineering, University of Massachusetts, Amherst, MA, USA. dongmeifeng@umass.edu.

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Summary
This summary is machine-generated.

Arctic rivers export more water and show greater acceleration than previously known. This study provides an updated, publicly available daily streamflow understanding for Arctic rivers using satellite data and modeling.

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Area of Science:

  • Hydrology
  • Remote Sensing
  • Climate Science

Background:

  • Arctic rivers influence global climate, ecosystems, and economies, but data is limited.
  • Understanding Arctic river dynamics is crucial for assessing climate change impacts.

Purpose of the Study:

  • To create a comprehensive, daily streamflow dataset for pan-Arctic rivers.
  • To improve understanding of water export and river behavior across the Arctic.

Main Methods:

  • Utilized satellite imagery to derive 9.18 million river discharge estimates.
  • Assimilated discharge data into hydrologic models for 486,493 river reaches (1984-2018).
  • Integrated remote sensing with advanced hydrologic modeling.

Main Results:

  • Calculated daily streamflow for nearly half a million Arctic river reaches.
  • Revealed 3-17% greater total water export and 1.2-3.3 times higher export acceleration.
  • Identified significant variations in streamflow influenced by basin characteristics, permafrost, and human activity.

Conclusions:

  • The study provides an unprecedentedly accurate and publicly accessible daily streamflow dataset for Arctic rivers.
  • Findings highlight greater hydrological heterogeneity and dynamism in Arctic river systems than previously understood.
  • Advances in remote sensing and modeling are key to understanding Arctic environmental change.