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Research: Lidar In Complex Terrain

The study explores the use of wind Lidars in complex terrain, addressing uncertainties, biases, and cost-effectiveness. It introduces horizontally scanning Lidars for enhanced measurement accuracy and proposes a measurement campaign to assess Lidar uncertainty and optimize cost-efficient configurations.

Purpose

 

The study explores the use of wind Lidars in complex terrain, addressing uncertainties, biases, and cost-effectiveness. It introduces horizontally scanning Lidars for enhanced measurement accuracy and proposes a measurement campaign to assess Lidar uncertainty and optimize cost-efficient configurations.

Method

 

Inhomogeneous flow across the swept measurement area of Lidars introduces measurement bias. CFD and other correction methods were developed to compensate for inhomogeneity caused by terrain effects. Uncertainty also relates to the deployment, processing and analysis of Lidar data by practitioners.

 

 

A primary purpose any measurement campaign is to reduce uncertainty in production estimates, but there is always a trade-off between uncertainty reduction and costs to achieve it.

 

 

Different configurations of masts and Lidars on a site could outperform a configuration of multiple measurement masts in terms of lowered uncertainty and costs. An additional possibility to increase cost savings is the implementation of horizontally scanning Lidars. These systems, able to scan in any desired configuration, expand the possibilities for conducting wind resource assessment in various new ways. Scanning horizontally (arc scanning) allows measuring multiple locations without moving the system. They can also be used to measure areas instead of point locations, allowing evaluation of spatial variation of shear, etc. A prerequisite, however, is that the uncertainty of Lidar measurements for these various scanning geometries is acceptable.

Result

 

To address the above issues, we designed a measurement campaign with three different lidar types with the following goals:

  • Assess the uncertainty of Lidar measurements in complex terrain
  • Test the usefulness/accuracy of horizontally scanning Lidars with variable scanning geometries
  • Design the most cost-efficient combination of Lidar and masts for measurement campaigns

 

Read the full publication here.

 

Authors

Klaus Vogstad – Meventus AS

Anne H. Simonsen – Meventus AS

Kyle J. Brennan – Meventus AS

John A. Lund – Meventus AS