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Experimental Investigation of the Flow Structure over a Delta Wing Via Flow Visualization Methods
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Dust flow analysis by low coherence Doppler lidar.

Kosuke Okubo1, Nofel Lagrosas2, Tatsuo Shiina2

  • 1Graduate School of Science and Engineering, Chiba University, Chiba-Shi, Chiba, 263-8522, Japan. kobo0404the25th@chiba-u.jp.

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This summary is machine-generated.

This study introduces a low-coherence Doppler lidar (LCDL) for high-resolution ground-level dust flow measurement. The novel technique accurately monitors dust dynamics, aiding air pollution studies and dust type identification.

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Area of Science:

  • Atmospheric Science
  • Geophysics
  • Environmental Monitoring

Background:

  • Ground-level dust flow and wind dynamics are crucial for understanding geosphere-atmosphere interactions.
  • Monitoring small-scale temporal and spatial dust flows is challenging but vital for air pollution and health management.

Purpose of the Study:

  • To develop and demonstrate a novel low-coherence Doppler lidar (LCDL) system.
  • To achieve high-resolution measurement of near-ground dust flow.
  • To validate the LCDL technique against established methods and assess its capability in dust characterization.

Main Methods:

  • Utilized a low-coherence Doppler lidar (LCDL) for dust flow measurement.
  • Conducted laboratory experiments in a wind tunnel with flour and calcium carbonate particles.
  • Compared LCDL data with anemometer measurements for wind speeds from 0 to 5 m/s.
  • Performed simulations to validate experimental dust flow results.

Main Results:

  • Achieved high temporal (5 ms) and spatial (1 m) resolutions for dust flow measurement.
  • Demonstrated good agreement between LCDL and anemometer measurements for wind speeds up to 5 m/s.
  • Showcased the LCDL technique's ability to reveal dust speed distributions influenced by particle mass and size.
  • Confirmed that different speed distribution profiles can differentiate dust types.
  • Validated simulation results against experimental findings.

Conclusions:

  • The developed LCDL system provides a viable method for high-resolution, near-ground dust flow monitoring.
  • LCDL technology offers insights into dust characteristics, aiding in air quality assessment and dust source identification.
  • The technique has significant potential for applications in environmental monitoring and air pollution control.