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Letter

A Flow-Measuring Algorithm of Arc-Bottomed Open Channels through Multiple Characteristic Sensing Points of the Flow-Velocity Sensor in Agricultural Irrigation Areas

by 1, 1, 1 and 2,*
1
College of Water Resources & Civil Engineering, China Agricultural University, 17 Tsinghua East Rd., Haidian District, Beijing 100083, China
2
College of Engineering, China Agricultural University, 17 Tsinghua East Rd., Haidian District, Beijing 100083, China
*
Author to whom correspondence should be addressed.
Sensors 2020, 20(16), 4504; https://doi.org/10.3390/s20164504
Received: 25 June 2020 / Revised: 1 August 2020 / Accepted: 6 August 2020 / Published: 12 August 2020
(This article belongs to the Special Issue Advances in Flow and Wind Sensors)
Precise flow measurement in the open channel is a key prerequisite to implementation of modern agricultural efficient water use. The channel with an arc-bottomed shape is the most common channel type in irrigation area at present. The paper has verified the log-law is along the normal line rather than along the vertical line in arc-bottom channel. By conducting the velocity distribution log-law, this paper derives the expression of the multiple characteristic sensing points location of the flow-velocity sensor in the channel section, which is along the normal line. Based on this, a new algorithm to estimate the discharge of the arc-bottomed channel flow is proposed. We have also developed the experiment of the arc-bottomed channels (including semicircular channels, arc-bottom trapezoidal channels and U-shaped channels) and utilize the data to verify the method. The results indicate that the sensing locations expression of the flow velocity measuring sensor such as acoustic doppler velocimetry and propeller is suitable for improving discharge estimation’s accuracy of the arc-bottomed channels. This method could be extensively used in estimating discharge of irrigation and drainage channels in agricultural water conservancy projects. It will enhance the efficiency and accuracy of water resources management departments in irrigation areas, which also meet the strategic requirements of agricultural sustainable development. View Full-Text
Keywords: open channel; flow measuring algorithm; discharge; characteristic sensing point open channel; flow measuring algorithm; discharge; characteristic sensing point
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MDPI and ACS Style

Han, Y.; Li, T.; Wang, S.; Chen, J. A Flow-Measuring Algorithm of Arc-Bottomed Open Channels through Multiple Characteristic Sensing Points of the Flow-Velocity Sensor in Agricultural Irrigation Areas. Sensors 2020, 20, 4504. https://doi.org/10.3390/s20164504

AMA Style

Han Y, Li T, Wang S, Chen J. A Flow-Measuring Algorithm of Arc-Bottomed Open Channels through Multiple Characteristic Sensing Points of the Flow-Velocity Sensor in Agricultural Irrigation Areas. Sensors. 2020; 20(16):4504. https://doi.org/10.3390/s20164504

Chicago/Turabian Style

Han, Yu, Tongshu Li, Shiyu Wang, and Jian Chen. 2020. "A Flow-Measuring Algorithm of Arc-Bottomed Open Channels through Multiple Characteristic Sensing Points of the Flow-Velocity Sensor in Agricultural Irrigation Areas" Sensors 20, no. 16: 4504. https://doi.org/10.3390/s20164504

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