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Boundary Layer Characteristics

Boundary Layer Characteristics

When a fluid encounters a solid surface, a boundary layer forms due to the interaction between the fluid's motion and the stationary surface. This phenomenon is characterized by a thin region adjacent to the surface where viscous forces dominate, influencing the fluid's velocity profile. The development of the boundary layer begins at the leading edge of the surface and evolves as the fluid moves downstream.As the fluid flows over the surface, friction between the fluid and the wall slows down...

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Ground-based forward-scattering bistatic Lidar for minute-scale, wide-area wind mapping.

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Area of Science:

Atmospheric Science
Remote Sensing
Optical Engineering

Background:

Accurate horizontal wind mapping is crucial for renewable energy applications and atmospheric research.
Existing wind measurement technologies have limitations in spatial coverage, temporal resolution, or cost-effectiveness.

Purpose of the Study:

To propose and model a novel ground-based bistatic Doppler-lidar network for wide-area, high-cadence horizontal wind mapping.
To establish design rules for optimizing lidar network performance based on key parameters.

Main Methods:

Development of a unified performance model integrating geometric factors, photon statistics, spectral sensitivity, and background radiance.
Simulation and sensitivity analyses to assess the impact of network configuration (receiver number, ring radius) and operational parameters (wavelength, background, pulse number).

Main Results:

Quantification of the influence of various parameters on wind measurement uncertainty and cadence.
Identification of design principles linking uncertainty thresholds to lidar network layout and operational settings.
Demonstration of the system's scalability for large-scale deployments.

Conclusions:

The proposed bistatic Doppler-lidar network provides a viable solution for minute-cadence, wide-area horizontal wind measurement.
The developed performance model and design rules facilitate optimized network deployment for applications like renewable energy site assessment and wind resource management.