本文選題：渠道 + 水力最佳斷面��； 參考：《灌溉排水學(xué)報(bào)》2017年11期

【摘要】：針對標(biāo)準(zhǔn)拋物線形渠道渠口寬、深度大、難以適應(yīng)大中型渠道等問題,提出了一種新型平方拋物線形渠坡和水平渠底的拋物線形復(fù)合渠道,同時(shí)推導(dǎo)出了拋物線復(fù)合渠道水力要素計(jì)算公式,并以水深、水面寬度和水平渠底寬度為變量,利用拉格朗日乘數(shù)法建立求最優(yōu)解的迭代方程,借助Mathcad數(shù)學(xué)軟件進(jìn)行計(jì)算,推導(dǎo)出了拋物線復(fù)合渠道水力最佳斷面情況下流量和水深的關(guān)系式以及水深、水面寬度、過水?dāng)嗝婷娣e和濕周的計(jì)算公式。通過實(shí)例計(jì)算,當(dāng)流量Q為12 m~3/s時(shí),在水力最佳斷面情況下拋物線復(fù)合渠道的水深H0為2.263 m,水面寬度B0為4.538 m,過水?dāng)嗝婷娣eA0為7.463 m~2。結(jié)果表明,相同流量下拋物線復(fù)合渠道的過水?dāng)嗝婷娣e比梯形渠道減小了1.67%,比弧腳梯形渠道減小了0.84%,比拋物線形渠道減小了1.05%,表明拋物線形復(fù)合渠道是更為優(yōu)越的渠道斷面形式。
[Abstract]:A new type of parabola channel slope and horizontal channel bottom is proposed to solve the problems of wide channel opening, large depth and difficult to adapt to large and medium-sized channel, a new type of parabola channel slope and horizontal channel bottom is proposed. At the same time, the calculation formula of hydraulic factor of parabolic composite canal is derived, and the iterative equation for finding the optimal solution is established by using Lagrange multiplier method, taking the depth of water, the width of water surface and the width of horizontal channel bottom as variables, and the calculation is carried out by Mathcad software. The relationship between discharge and water depth and the calculation formulas of water depth, water surface width, cross section area and wet circumference of parabolic composite canal under the optimal hydraulic section are derived. The calculation results show that when the flow rate Q is 12 m / 3 / s, the water depth H _ 0 is 2.263 m, the water surface width B _ 0 is 4.538 m, and the cross section area A _ 0 is 7.463 m ~ (2) under the optimal hydraulic section condition, the water depth H _ 0 is 2.263 m, the water surface width B _ 0 is 4.538 m, and the cross section area A _ 0 is 7.463 m / m. The results show that At the same flow rate, the cross section area of the parabolic composite channel is 1.67 smaller than that of the trapezoidal channel, 0.84 of the trapezoidal channel at the arc foot, and 1.05 of the parabolic channel, which indicates that the parabolic composite channel is a more superior channel section form.
【作者單位】： 西北農(nóng)林科技大學(xué)水利與建筑工程學(xué)院;旱區(qū)農(nóng)業(yè)水土工程教育部重點(diǎn)實(shí)驗(yàn)室;
【基金】：國家“十三五”重點(diǎn)研發(fā)課題(2016YFC0400203)
【分類號】：TV133

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