Velocity distribution and discharge calculation at a sharpcrested weir
 ShunChung Tsung,
 JihnSung Lai,
 DerLiang Young
 … show all 3 hide
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A sharpcrested weir in open channel is a useful device to calculate discharge via headdischarge relationship. However, water stage measurement site and discharge coefficient significantly influence discharge calculation accuracy. Therefore, this study measures and simulates velocity distribution at the weir section using 16MHz MicroADV and FLOW3D, respectively. The water depth and surface velocity at the weir section are selected to characterize velocity distribution using gamma probability density function. In this study, accurate discharge is calculated by velocity–area integration method based on velocity distribution derived from measured water depth and surface velocity. The main contributions of this study are to give an exact measurement site, link velocity distribution and discharge, avoid discharge coefficient influence, and improve discharge calculation accuracy.
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 Title
 Velocity distribution and discharge calculation at a sharpcrested weir
 Journal

Paddy and Water Environment
Volume 12, Issue 1 , pp 203212
 Cover Date
 20140101
 DOI
 10.1007/s103330130378y
 Print ISSN
 16112490
 Online ISSN
 16112504
 Publisher
 Springer Japan
 Additional Links
 Topics
 Keywords

 Sharpcrested weir
 Velocity distribution
 Surface velocity
 Crest Froude number
 Authors

 ShunChung Tsung ^{(1)}
 JihnSung Lai ^{(2)}
 DerLiang Young ^{(3)}
 Author Affiliations

 1. Taiwan Typhoon and Flood Research Institute, 11F., No. 97, Sec. 1, Roosevelt Road, Taipei, 10093, Taiwan
 2. Hydrotech Research Institute, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei, 10617, Taiwan
 3. Department of Civil Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei, 10617, Taiwan