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Updated: Oct 10, 2025

Parameterizing V-notch Weir Equations for Flow Monitoring in a Drainage Control Structure
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Damming the wood falls.

Ellen Wohl1, Emily P Iskin1

  • 1Department of Geosciences, Colorado State University, Fort Collins, CO 80523-1482, USA.

Science Advances
|December 10, 2021
PubMed
Summary
This summary is machine-generated.

Rivers deliver millions of cubic meters of driftwood to oceans annually, impacting coastal ecosystems. Reduced wood flux due to human activity may harm marine environments.

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Area of Science:

  • Environmental science
  • Oceanography
  • Ecology

Background:

  • Rivers historically transported significant driftwood volumes to the ocean.
  • Driftwood is crucial for coastal sediment dynamics, providing habitat and food for marine organisms.
  • Human activities like deforestation and river engineering have reduced driftwood flux to oceans.

Purpose of the Study:

  • To estimate the magnitude of contemporary global driftwood fluxes to the oceans.
  • To assess the potential impact of reduced driftwood flux on coastal and marine environments.

Main Methods:

  • Utilized contemporary records of wood flux to reservoirs and coastal regions.
  • Estimated potential contemporary global wood fluxes based on available data.

Main Results:

  • An estimated 4.7 million m³ of large wood may enter the oceans annually.
  • The 95% prediction interval for annual wood flux ranges from approximately 300,000 to 70 million m³.
  • Current wood flux is an upper bound for contemporary fluxes due to wood removal and a lower bound for historical fluxes.

Conclusions:

  • Substantial reductions in riverine driftwood flux negatively affect coastal and marine ecosystems.
  • Understanding historical and contemporary wood fluxes is vital for marine conservation efforts.