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Three-Dimensional Pressure-Sphere Anemometer System

G. W. ThurtellDept. of Soil Science, University of Wisconsin, Madison

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C. B. TannerDept. of Soil Science, University of Wisconsin, Madison

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M. L. WeselyDept. of Soil Science, University of Wisconsin, Madison

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Abstract

A rugged and stable pressure-sphere anemometer system is described which Provides an accurate measurement of wind velocity and direction within a meter of the ground. The horizontal wind velocity, (u2 + v2)½, agreed very closely with cup anemometer measurements, indicating good accuracy in the measurement of the dominant term u. Eddy correlation measurements of shear stress with the pressure sphere agreed very well with Davis shear-stress meter measurements and satisfactory agreement was found with data obtained from wind velocity profiles and from wind measurements using a drag coefficient. Ratios of σw/u* during neutral periods were found to be in excellent agreement with values derived by Panofsky and Lettau, providing further indication of the accuracy obtainable with the pressure-sphere system.

Abstract

A rugged and stable pressure-sphere anemometer system is described which Provides an accurate measurement of wind velocity and direction within a meter of the ground. The horizontal wind velocity, (u2 + v2)½, agreed very closely with cup anemometer measurements, indicating good accuracy in the measurement of the dominant term u. Eddy correlation measurements of shear stress with the pressure sphere agreed very well with Davis shear-stress meter measurements and satisfactory agreement was found with data obtained from wind velocity profiles and from wind measurements using a drag coefficient. Ratios of σw/u* during neutral periods were found to be in excellent agreement with values derived by Panofsky and Lettau, providing further indication of the accuracy obtainable with the pressure-sphere system.

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