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A shearing stress meter for micrometeorological studies
Author(s) -
Bradley E. F.
Publication year - 1968
Publication title -
quarterly journal of the royal meteorological society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.744
H-Index - 143
eISSN - 1477-870X
pISSN - 0035-9009
DOI - 10.1002/qj.49709440112
Subject(s) - metre , shearing (physics) , environmental science , meteorology , atmospheric sciences , geology , geotechnical engineering , geography , physics , astronomy
A shearing stress meter (drag plate) for general use in micrometeorological studies is described. The mechanical principle applies to a large size range, though the instrument described specifically is of 3 ft (91 cm) diameter for installation in turf sites. The drag force is measured using strain gauges, and an absolute calibration system is built into the mechanism. The resolution of the instrument is about 0·02 dyne cm −2 , and it will tolerate gusts of over 10 dyne cm −2 without damage. A detailed description is also given of the installation and operating procedure, attention to which is essential for reliable measurements.