The effect of a precipitation gauge orifice rim on the wind field deformation as investigated in a wind tunnel |
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| Affiliation: | 1. Linné FLOW Centre, KTH Mechanics, Osquars Backe 18, Stockholm, Sweden;2. Department of Mechanical, Materials and Aerospace Engineering (MMAE), llinois Institute of Technology (IIT), Chicago, IL, 60616, USA;1. University of California-Riverside, Center for Conservation Biology, 900 University Ave, Riverside, CA 92521, United States;2. University of California-Riverside, Department of Botany and Plant Sciences, 900 University Ave, Riverside, CA 92521, United States;3. Department of Planning and Development, Aalborg University Copenhagen, Copenhagen, Denmark;4. Department of Civil and Environmental Engineering, Cullen College of Engineering, University of Houston, Houston TX 77004, United States;5. Urban Development and Mobility Department, LISER, Luxembourg;6. Department of GIS and Remote Sensing, Tarbiat Modares University, Tehran, Iran;1. NASA/Goddard Space Flight Center, Greenbelt, MD 20770, USA;2. Department of Physics, American University, Washington, DC 20016, USA;3. GPHI/UMBC, NASA/Goddard Space Flight Center, Greenbelt, MD 20770, USA;1. Nuclear Science and Engineering Program, Metallurgical and Materials Engineering Department, Colorado School of Mines, 1500 Illinois St., Golden, CO 80401, United States;2. Metallurgical and Materials Engineering Department, Colorado Center for Advanced Ceramics, Colorado School of Mines, 1500 Illinois St., Golden, CO 80401, United States;3. Nuclear Science and Engineering Program, Chemistry and Geochemistry Department, Colorado School of Mines, 1500 Illinois St., Golden, CO 80401, United States |
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| Abstract: | The ASTA precipitation gauge has shown systematically less precipitation than the Hellmann gauge. To explain the deficit, wind speed and turbulence intensity profiles above the orifice of both gauges have been measured in a wind tunnel. They showed greater values of wind speed increment and smaller values of intensity of turbulence for the ASTA gauge. This indicates that the deficit is due to the larger wind field deformation above the ASTA gauge. The reasons for this are the bigger orifice rim and the bird protection ring used occasionally on this gauge. The effect of turbulence intensity with respect to the deficit has not been explained as yet. |
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