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How Have Global River Widths Changed Over Time?

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Summary
This summary is machine-generated.

This study introduces the Global LOng-term river Width (GLOW) dataset, providing billions of river width measurements from 1984-2020. It reveals significant temporal width changes in 37% of global rivers, influenced by climate or soil conditions.

Keywords:
driving factorsglobal river widthtemporal trendtemporal variability

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Area of Science:

  • Hydrology and Geomorphology
  • Remote Sensing and Earth Observation
  • Environmental Science

Background:

  • River width dynamics are crucial for understanding hydraulic, hydrologic, and biogeochemical processes, as well as geomorphologic evolution.
  • Existing global datasets lack standardized temporal assessments of river width changes.
  • The Global LOng-term river Width (GLOW) dataset addresses this gap by providing extensive historical river width data.

Purpose of the Study:

  • To create a comprehensive global dataset of long-term river width variations.
  • To investigate temporal trends and variability in global river widths.
  • To identify key drivers of river width changes in both free-flowing and human-impacted rivers.

Main Methods:

  • Utilized Landsat satellite imagery to derive river width measurements for rivers wider than 90m from 1984 to 2020.
  • Compiled the Global LOng-term river Width (GLOW) dataset, containing approximately 1.2 billion cross-sectional width measurements.
  • Applied statistical analysis to quantify width variability (IQR) and temporal trends, and employed machine learning to determine influencing factors.

Main Results:

  • The GLOW dataset comprises ~1.2 billion width measurements, with an average of 3,000 measurements per 10-km reach.
  • 85% of global rivers exhibit an interquartile range (IQR) of width less than 150m.
  • 37% of river segments show significant temporal width trends over 37 years, with 46% for human-regulated rivers.
  • Climate is the primary driver for free-flowing rivers, while soil conditions are key for human-impacted rivers.

Conclusions:

  • The GLOW dataset offers an unprecedented resource for studying global river dynamics.
  • Significant temporal variations in river width are widespread and influenced by distinct factors depending on river regulation status.
  • This research enhances understanding of river systems and encourages interdisciplinary studies on river management and environmental change.