ASTM D5741-96(2023) PDF

Overview

ASTM D5741-96(2023): Standard Practice for Characterizing Surface Wind Using a Wind Vane and Rotating Anemometer establishes standardized methods for quantifying surface wind characteristics using established instruments such as wind vanes and rotating anemometers. Developed by ASTM International, this practice ensures that wind data is both accurate and practical across a variety of applications, while minimizing storage requirements for archived data.

This standard is essential for fields that rely on reliable wind data, such as air quality assessment, wind engineering, wind energy, agriculture, meteorology, oceanography, aviation, climatology, severe weather analysis, and utility management. The consensus-based approach guarantees broad industry acceptance and practical applicability.

Key Topics

• Measurement Parameters: The standard defines procedures for measuring surface wind speed, wind direction, peak one-minute speeds, peak three-second and one-minute speeds, and the standard deviation of wind speed and direction.
• Sensor Requirements: Wind vanes and rotating anemometers are specified, but the practice is adaptable to other sensors meeting equivalent or better response characteristics and measurement uncertainty.
• Data Output and Archiving:
  • Standard 10-minute interval reporting for detailed data.
  • Optional condensed 60-minute reporting for reduced archival storage.
• Siting and Installation: Guidelines are provided for optimal sensor placement, such as 10 meters above level or gently sloping terrain with an open fetch, to ensure the highest data quality and consistency.
• Sampling Techniques: Recommends a minimum sampling interval of 3 seconds for both wind speed and direction, with a preference for faster sampling (1 second where possible) to improve peak gust characterization.
• System Performance and Quality Assurance:
  • Regular calibration and audits according to recognized methods (e.g., traceable to NIST).
  • Documentation and station logs are required for data traceability.
  • Continuous monitoring and automatic range/rate tests to ensure ongoing measurement reliability.
• Data Documentation: Mandates comprehensive record-keeping, including station identification, location, sensor types, calibration history, siting photos, and system configuration.

Applications

The methodology provided by ASTM D5741-96(2023) is invaluable for any industry or research area that depends on qualitative and quantitative assessments of surface wind. Key applications include:

• Environmental monitoring: Supporting air quality and pollution studies by providing high-precision wind characterization.
• Wind energy development: Assisting in site evaluation, turbine siting, and performance prediction.
• Infrastructure engineering: Providing data critical to wind engineering and designing structures to withstand wind loads.
• Agricultural planning: Understanding wind patterns for crop protection and management.
• Weather forecasting and climatology: Supplying foundational data for short- and long-term wind trend analysis and severe storm research.
• Aviation and oceanography: Enhancing safety and operational planning through accurate surface wind data.
• Military and utility operations: Informing strategic planning, emergency response, and network reliability.

Related Standards

Alignment with related ASTM standards ensures consistent terminology and measurement integrity:

• ASTM D1356: Terminology Relating to Sampling and Analysis of Atmospheres.
• ASTM D5096: Test Method for Determining the Performance of a Cup Anemometer or Propeller Anemometer.
• ASTM D5366: Test Method for Determining the Dynamic Performance of a Wind Vane.

Additional guidance on quality assurance and site-specific documentation enhances the reliability and global acceptance of the practice.

By adhering to ASTM D5741-96(2023), organizations and researchers can ensure their wind data collection is robust, accurate, and universally applicable, facilitating informed decisions across a wide array of technical disciplines.