Clarifying Accuracy Degradation Factors of Sluice Gate Outflow Discharge by Analysis of Toch's formula

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  • SUZUKI Hiroyuki
    National Institute of Technology, Ishikawa College, Department of Civil Engineering
  • SASSA Yuuta
    National Institute of Technology, Ishikawa College, Advanced Engineering Course (Current Address: Wakachiku Construction Co., Ltd)
  • OKABE Hajime
    National Institute of Technology, Ishikawa College (Current Address: Hokuriku Electric Power Company)
  • ISHII Akira
    Toyama Office of River and National Highway, River Planning Division
  • KUDOH Hiroyuki
    Toyama Office of River and National Highway, River Planning Division

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Other Title
  • Tochの式の解析によるスルースゲートからの推定放流量の精度劣化要因の解明
  • Toch ノ シキ ノ カイセキ ニ ヨル スルースゲート カラ ノ スイテイ ホウリュウリョウ ノ セイド レッカ ヨウイン ノ カイメイ

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Abstract

 Oyabe weir construted in the Oyabe River is used for the intake of agricultural water. Oyabe weir has three sluice gates that are operated during a flood. The outflow discharge is calculated using Toch’s formula. The discharge of Oyabe river is measured at the Tsuzawa discharge gaging station located 1.7 km downstream from Oyabe weir.However, the outflow discharge from the sluice gate differs from the river discharge measured at Tsuzawa gaging station during a flood. <br> As described in this paper, the hydraulic characteristics of Toch’s formula were clarified by mathematical analysis emphasizing the classification of ‘submerged efflux’ and ‘free efflux’. A method for calculating free flow is discussed in this paper. For Oyabe weir, a new method of applying Toch’s formula that incorporates hydraulic characteristics confirmed through mathematical analysis is proposed. An effect of the new application method is discussed based on result estimated using the new method for field measurement data.

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