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Related Concept Videos

Migration00:53

Migration

Migration is long-range, seasonal movement from one region or habitat to another. This common strategy, carried out by many different organisms around the world, is an adaptive response that typically corresponds to changes in an organism’s environment, like resource availability or climate. Migrations can involve huge groups of thousands of animals as well as single individuals traveling alone and can range from thousands of kilometers to just a few hundred meters.
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The provided content explores the behavior of traveling waves on single-phase lossless transmission lines. It begins with a single-phase two-wire lossless transmission line of length Δx, characterized by a loop inductance LH/m and a line-to-line capacitance C F/m. These parameters result in a series inductance LΔx and a shunt capacitance CΔx.
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Related Experiment Video

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Kinematic History of a Salient-recess Junction Explored through a Combined Approach of Field Data and Analog Sandbox Modeling
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Kinematic History of a Salient-recess Junction Explored through a Combined Approach of Field Data and Analog Sandbox Modeling

Published on: August 5, 2016

Sand dunes as migrating strings.

L Guignier1, H Niiya, H Nishimori

  • 1Institut de Physique de Rennes, CNRS UMR 6251, Université de Rennes 1, 35042 Rennes cedex, France.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|June 18, 2013
PubMed
Summary
This summary is machine-generated.

We created a simplified model for 3D sand dune evolution, focusing on crest line dynamics. This model explains barchan dune behavior and transverse dune instability, predicting fragmentation into smaller dunes.

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Area of Science:

  • Geomorphology
  • Fluid dynamics
  • Computational modeling

Background:

  • Sand dunes exhibit complex 3D dynamics under unidirectional wind.
  • Understanding dune morphology and migration is crucial for various Earth science disciplines.
  • Previous models often lack the simplicity needed for broad application to 3D dune types.

Purpose of the Study:

  • To develop a reduced complexity model for three-dimensional (3D) sand dune evolution.
  • To provide a simplified framework for investigating barchan and transverse dunes.
  • To analyze the stability of transverse dunes and predict their morphological transitions.

Main Methods:

  • Simplified description of longitudinal and lateral sand transport.
  • Reduction of dune evolution to the dynamics of its crest line.
  • Derivation of analytical solutions and stability analysis.

Main Results:

  • Analytical solutions derived for barchan dune migration.
  • Transverse dune stability shown to depend on relative lateral transport rates (slip face vs. upwind face).
  • Prediction of wavelength and timescale for transverse dune evolution into wavy ridges and fragmentation into barchan dunes.

Conclusions:

  • The reduced complexity model offers a tractable framework for 3D dune dynamics.
  • The model elucidates the conditions governing transverse dune instability and pattern formation.
  • Findings contribute to a better understanding of aeolian geomorphology and dune system evolution.