Experimental evidence on the performance of rating curves for continuous discharge estimation in complex flow situations
Experimental evidence on the performance of rating curves for continuous discharge estimation in complex flow situations
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DOI：
10.1016/j.jhydrol.2018.11.021
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发表时间：
2019-01-01
影响因子：
6.4
通讯作者：
Hulme, Jim
中科院分区：
文献类型：
--
作者：
Cheng, Zhengyang;Lee, Kyutae;Hulme, Jim
本文介绍了在非理想计量站用分级流量(HQRC)和指数流速(IVRC)额定值监测径流的各个方面，并强调了它们在快速变化的非恒定流中的可靠性。为此，本文分析了定制实验获得的数据，这些实验跟踪了流动相在流动转变过程中的发展。该分析将HQRC和IVRC额定流量与声学多普勒水流剖面仪(ADCP)和安装在涡轮机外壳中的流量计直接测量的流量进行了比较，这些流量计释放了下游通道中的流量。研究发现，在恒定水流中，HQRC和IVRC方法都在被广泛接受的流量测量的+/-5%阈值范围内，尽管现场与流量测量选址指南有相当大的偏差。对于非定常流动，IVRC的性能明显优于HQRC。试图补充用于评估由评级提供的流量估计的质量的典型统计分析，该分析具有对恶化通过站的流量估计的质量的流动特性的洞察。
The paper presents various aspects of monitoring streamflows with stage-discharge (HQRC) and index-velocity (IVRC) based ratings at a non-ideal gaging station with emphasis on their reliance during fast-varying unsteady flows. For this purpose, the paper analyzes data obtained from customized experiments whereby the flow phases are tracked as they develop during flow transitions. The analysis compares discharges obtained from HQRC and IVRC ratings with those directly measured with Acoustic Doppler Current Profilers (ADCP) and a flowmeter set in the housing of the turbines that release the flow in the downstream channel. It is found that during steady flows, both HQRC and IVRC methods perform within the widely accepted +/- 5% thresholds recommended for streamflow gaging despite that the site considerably deviates from the guidelines for gaging site selection. For unsteady flows, the performance of the IVRC is considerably better than HQRC. Attempts are made to complement the typical statistical analysis used for assessing the quality of discharge estimates provided by the ratings with insights into flow characteristics that deteriorate the quality of the flow estimates passing through the stations.