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    Calibration Technology for a Radar Surface Velocimeter

    Source: Journal of Hydraulic Engineering:;2025:;Volume ( 151 ):;issue: 004::page 04025016-1
    Author:
    Yi-Jun Huang
    ,
    Po-Hsu Tsai
    ,
    C. C. Sung
    ,
    K. F. Liu
    DOI: 10.1061/JHEND8.HYENG-14030
    Publisher: American Society of Civil Engineers
    Abstract: In Taiwan, climate change exacerbates challenges such as steep slopes, rapid flow, landslides, and erosion, leading to more extreme hydrological events. River flow monitoring during typhoons and floods is difficult, often relying on propeller current meters. High flow velocities pose measurement challenges. Since 2005, handheld radar surface current meters have been used for flow velocity observation at hydrological stations. However, radar surface velocimeters (RSVs) lack suitable calibration equipment. This study proposes an annular flume for high-speed calibration (up to 20  m/s), fixing the velocimeter onto rotating platforms to establish a linear relationship between flow velocity and platform rotational speed. Optical validation confirmed its calibration suitability. Calibration errors include rotational speed, velocimeter angle, water surface distance, perturbations, and sediment concentration. The stable rotating platform provides reliable calibration, with optimal conditions at a 45° angle and 0.5–1.0-m distance. Water fluctuations impact velocimeter sensitivity; suspended particles improve stability. The annular flume design effectively calibrates radar surface velocimeters for high-speed measurements, addressing measurement challenges. This study provides critical insights for hydrological observations in Taiwan’s challenging terrain.
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      Calibration Technology for a Radar Surface Velocimeter

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4307449
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    contributor authorYi-Jun Huang
    contributor authorPo-Hsu Tsai
    contributor authorC. C. Sung
    contributor authorK. F. Liu
    date accessioned2025-08-17T22:47:16Z
    date available2025-08-17T22:47:16Z
    date copyright7/1/2025 12:00:00 AM
    date issued2025
    identifier otherJHEND8.HYENG-14030.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4307449
    description abstractIn Taiwan, climate change exacerbates challenges such as steep slopes, rapid flow, landslides, and erosion, leading to more extreme hydrological events. River flow monitoring during typhoons and floods is difficult, often relying on propeller current meters. High flow velocities pose measurement challenges. Since 2005, handheld radar surface current meters have been used for flow velocity observation at hydrological stations. However, radar surface velocimeters (RSVs) lack suitable calibration equipment. This study proposes an annular flume for high-speed calibration (up to 20  m/s), fixing the velocimeter onto rotating platforms to establish a linear relationship between flow velocity and platform rotational speed. Optical validation confirmed its calibration suitability. Calibration errors include rotational speed, velocimeter angle, water surface distance, perturbations, and sediment concentration. The stable rotating platform provides reliable calibration, with optimal conditions at a 45° angle and 0.5–1.0-m distance. Water fluctuations impact velocimeter sensitivity; suspended particles improve stability. The annular flume design effectively calibrates radar surface velocimeters for high-speed measurements, addressing measurement challenges. This study provides critical insights for hydrological observations in Taiwan’s challenging terrain.
    publisherAmerican Society of Civil Engineers
    titleCalibration Technology for a Radar Surface Velocimeter
    typeJournal Article
    journal volume151
    journal issue4
    journal titleJournal of Hydraulic Engineering
    identifier doi10.1061/JHEND8.HYENG-14030
    journal fristpage04025016-1
    journal lastpage04025016-11
    page11
    treeJournal of Hydraulic Engineering:;2025:;Volume ( 151 ):;issue: 004
    contenttypeFulltext
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