• Title, Summary, Keyword: 하천유량산정식

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Estimation of discharge coefficients of the broad-crested side weir with various levee's side slope of main channel (본류수로의 제방사면경사에 따른 광정횡월류위어의 유량계수 산정)

  • Kang, Ho-Seon;Cho, Hong-Je
    • Journal of Korea Water Resources Association
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    • v.49 no.11
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    • pp.941-949
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    • 2016
  • The flow characteristics of the broad-crested side weir considering the levee's side slope of main channel ($ES_{ch}$) was investigated through hydraulic experiment in order to estimate the discharge coefficient equation. For applicability to actual river, levee's side slope of main channel 1:0.5, 1:1 and 1:2 were selected. Experimental results show that the new estimated equation for the discharge coefficient including $ES_{ch}$ is reasonable and effective in actual applications by comparing estimated and measured discharge over side weirs. Through a multiple linear regression analysis the importance of variabes were ordered as $ES_{ch}$ > $h/y_u$ > $L/y_u$ > $Fr_u$. Especially the discharge coefficient equation without $Fr_u$ was suggested, and the high applicability was reviewed by comparing the measured and calculated overflow of broad-chested side weir.

A Study on Development of Estimation for Discharge Rate Reflecting Water Surface Slope (수면경사를 반영한 하천 유량산정에 관한 연구)

  • Choo, Tai Ho;Hong, Soon Heon;Park, Sang Jin;Kim, Young Hwan
    • The Journal of the Korea Contents Association
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    • v.17 no.2
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    • pp.535-542
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    • 2017
  • There is a big difference of discharge rate between drought and flood period in Korea since the importance of water resources management has come to the fore. To know a river characteristics, it needs to estimate river discharge accurately. River discharge is calculated using the measured velocity of cross section and the estimated area of watercourse as input parameters into continuity equation. Generally, flow rate over a river is estimated from the relation equation between level and discharge, in this case, there are weakness for only the equal depths and the equal discharge estimated. In the present study, therefore, water surface slope was estimated using measured water level of Seongseo water level observation station and measured water level using ADVM at Gangchang Bridge. And then, we developed the discharge calculation equation using water surface slope. A method to easily calculated flow rate from the measured depth of the two points that are suggested by reflecting water surface slope because natural stream is unsteady flow, not uniform flow or not steady flow.