Next Article in Journal
Effects of Water Depth and Ice Thickness on Ice Cover Blasting for Ice Jam Flood Prevention: A Case Study on the Heilong River, China
Previous Article in Journal
A Dynamic Study of a Karst Spring Based on Wavelet Analysis and the Mann-Kendall Trend Test
Article Menu
Issue 6 (June) cover image

Export Article

Open AccessArticle
Water 2018, 10(6), 699; https://doi.org/10.3390/w10060699

Discharge Coefficient of Combined Orifice-Weir Flow

1
College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China
2
Civil and Environmental Engineering, University of California Davis, Davis, CA 95616, USA
*
Author to whom correspondence should be addressed.
Received: 17 February 2018 / Revised: 23 May 2018 / Accepted: 25 May 2018 / Published: 28 May 2018
(This article belongs to the Section Hydraulics)
Full-Text   |   PDF [3034 KB, uploaded 28 May 2018]   |  

Abstract

Combined orifice-weir flow is a complex phenomenon in hydropower and the discharge capacity of a structure affects the safety of the structure. It is essential to propose an equation for computing the discharge coefficient of combined orifice-weir flow. Based on theoretical analyses and physical experiments, 284 laboratory tests were performed to determine the discharge coefficient. The parameters affecting the discharge coefficient were determined and the relationships between the coefficient and four parameters, that is, the ratio of the water head to the upstream water level, the ratio of orifice height to orifice-weir height, the ratio of orifice height to the water head, and the ratio of the length to the height of the orifice-weir structure, were established. According to the dimensional analysis and the linear-fitting method of multidimensional ordinary least squares, five models were constructed to analyze the sensitivity of the model’s accuracy by using different parameters. The sensitivity to each parameter was also evaluated. The results were examined with statistical indices and they showed that one model yielded the best results, which were consistent with the experimental values. Thus, the proposed model is effective in estimating the discharge coefficient of combined orifice-weir flow. View Full-Text
Keywords: combined orifice-weir flow; discharge capacity; discharge coefficient; sensitivity analysis; statistical indexes combined orifice-weir flow; discharge capacity; discharge coefficient; sensitivity analysis; statistical indexes
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Fu, Z.-F.; Cui, Z.; Dai, W.-H.; Chen, Y.-J. Discharge Coefficient of Combined Orifice-Weir Flow. Water 2018, 10, 699.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Water EISSN 2073-4441 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top