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DOI	10.1016/j.jhydrol.2012.05.046
	Measuring shallow water flow velocity with virtual boundary condition signal in the electrolyte tracer method
	Shi, Xiaonan; Zhang, Fan; Lei, Tingwu; Chuo, Ruiyuan; Zhou, Shumei; Yan, Yan
通讯作者	Lei, TW (通讯作者)
发表日期	2012
ISSN	0022-1694
EISSN	1879-2707
起始页码	172
结束页码	179
卷号	452
英文摘要	Accurate measurement of hill-slope shallow water flow velocity is an important issue in soil erosion prediction. The pulse model of electrolyte tracer advanced by Lei et al. (2005) indicated that the boundary condition is critical for accurate velocity measurement. To improve the measurement accuracy, Lei et al. (2010) improved the method by employing practically measured boundary condition instead of the pulse assumption, by an additional sensor close to the electrolyte injection location. The measurement precision was improved significantly as compared with that by the pulse model. However, the measured boundary condition is not the actual boundary condition, which may still cause errors in the measured velocities. The sensor for boundary measurement can otherwise be used to measure flow velocity if it can be rationally determined without measurement. In this study, modifications are made to the previous methods. The boundary condition is not measured by an additional sensor but is determined by fitting the model to the experimental data so as to determine virtual/real boundary condition (Virtual B.C.) at its actual position and the flow velocity simultaneously. The measured velocities and the estimated boundary condition are verified using the experimentally measured data involved three flow rates (12, 24 and 48 L min(-1)), three slope gradients (4 degrees, 8 degrees and 12 degrees) and six measurement positions (0.05, 0.3, 0.6, 0.9, 1.2, and 1.5 m). The newly-proposed Virtual B.C. method improved the measurement precision of velocities as compared with those by the previous methods. An additional experimental data set is used for sensitivity analysis. This experiment involves three flow rates (12, 24 and 48 L min(-1)), three slope gradients (4 degrees, 8 degrees and 12 degrees), four measurement positions (0.3, 0.6, 0.9, and 1.2 m), and three electrolyte injection durations (0.2, 0.3, and 0.4 s). The sensitivity analysis on measured velocity indicates that the Virtual B.C. method shows significant advantage of stability, regardless of electrolyte injection duration. The improvement is relatively more significant for shorter distance measurement and shorter electrolyte injection duration. The results are very encouraging to claim that the improved method is sound for short distance measurement and for portable instrument development. (C) 2012 Elsevier B.V. All rights reserved.
关键词	SOIL-EROSION OVERLAND HILLSLOPE MODEL
英文关键词	Shallow water flow; Velocity measurement; Electrolyte tracer; Virtual boundary condition; Sensitivity analysis
语种	英语
WOS研究方向	Engineering ; Geology ; Water Resources
WOS类目	Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources
WOS记录号	WOS:000306777500016
来源期刊	JOURNAL OF HYDROLOGY
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/258048
推荐引用方式 GB/T 7714	Shi, Xiaonan,Zhang, Fan,Lei, Tingwu,et al. Measuring shallow water flow velocity with virtual boundary condition signal in the electrolyte tracer method[J]. 中国科学院青藏高原研究所,2012,452.
APA	Shi, Xiaonan,Zhang, Fan,Lei, Tingwu,Chuo, Ruiyuan,Zhou, Shumei,&Yan, Yan.(2012).Measuring shallow water flow velocity with virtual boundary condition signal in the electrolyte tracer method.JOURNAL OF HYDROLOGY,452.
MLA	Shi, Xiaonan,et al."Measuring shallow water flow velocity with virtual boundary condition signal in the electrolyte tracer method".JOURNAL OF HYDROLOGY 452(2012).