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Calibration and influencing factors analysis of the stage-discharge relation of non-standard section method in open channels |
LIANG Huizhen1, ZONG Quanli1,2*, LIU Zhenji1, XIE Yan1, LIU Dongdong1 |
1. College of Water Conservancy & Architectural Engineering, Shihezi University, Shihezi, Xinjiang 832000, China; 2. College of Resources and Environment, Qingdao Agricultural University, Qingdao, Shandong 266109, China |
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Abstract In order to explore the calibration problem of the water level-flow relationship curve for open channel non-standard section flow measurement, 25 channel water measurement sections in a regiment field of the Third Division of Xinjiang were taken as the research object, and the water level-flow relationship was calibrated using a FlowTracker2 handheld acoustic Doppler current meter. Based on the actual measurement results, the water level and flow relationship curves of each channel water-measuring section were calibrated, and the calculated curves were subjected to sign inspection, line fitting testing, deviation numerical testing, and error analysis. On this basis, the flow rate was simulated, and the influencing factors of the combined flow fitting parameters were analyzed. The results show that among the 25 calibrated channel water measurement 14 sections have stable water level-flow relationships, 5 sections are affected by backwater, and 6 sections are affected by channel siltation and have unstable water level-flow relationships. Under the same conditions of channel roughness coefficient n, slope coefficient m and slope i, the flow fitting parameters generally correlates positively with the channel bottom width b; under the same conditions of channel roughness coefficient n, slope coefficient m, and bottom width b, the flow fitting parameters generally correlates negatively with the channel slope i. The research results can provide a reference basis for checking the flow measurement accuracy of automatic water-measuring equipment in irrigation areas.
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Received: 05 November 2021
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