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Simulation and prediction of discharge coefficient of combined weir–gate structure
Proceedings of the Institution of Civil Engineers - Water Management ( IF 1.1 ) Pub Date : 2020-09-08 , DOI: 10.1680/jwama.19.00047
Nima Aein 1 , Mohsen Najarchi 2 , Seyyed Mohammad Mirhosseini Hezaveh 3 , Mohammad Mehdi Najafizadeh 4 , Ehsanollah Zeighami 3
Affiliation  

Combined weir–gate structures are important structures for controlling the water level, measuring discharge and avoiding sediment deposition behind a weir. They can be used, for example, in irrigation channels and waste water systems. Using three-dimensional numerical software (Flow-3D) and experimental data from the literature, four combined systems of a triangular weir and a rectangular gate with different geometries were simulated. Dimensional analyses were then performed to determine the dimensionless parameters that affect the discharge coefficient of such structures. Four different intelligent system models were used to estimate the discharge coefficient and their results were compared. It was found that Flow-3D is highly capable of simulating the flow over a combined structure. Goodness of fit criteria also showed that the numerical solver estimated the water head and discharge coefficient very well. The results of all the models showed that the discharge coefficient had an inverse relation with the dimensionless parameters h/b, h/d and h/y (h being the water head over the weir, b the gate width, d the gate height and y the distance between the bottom of the weir and above the gate); the discharge coefficients were 0·3–0·9. Accuracy analyses of six intelligent system models showed that the multi-layer perceptron model was the superior model, followed by the M5P model, the regression equation, the radial basis function and the generalised regression neural network model.

中文翻译:

堰门组合结构排水系数的模拟与预测

堰门组合结构是控制水位,测量流量和避免沉积物沉积在堰后的重要结构。它们可用于例如灌溉渠道和废水系统。使用三维数值软件(Flow-3D)和来自文献的实验数据,对具有不同几何形状的三角形堰和矩形闸的四个组合系统进行了仿真。然后进行尺寸分析以确定影响这些结构的排放系数的无量纲参数。使用四种不同的智能系统模型来估计排放系数,并对它们的结果进行比较。发现Flow-3D具有很高的模拟组合结构上的流动的能力。拟合标准的良好性还表明,数字求解器很好地估计了水头和流量系数。所有模型的结果表明,流量系数与无量纲参数成反比。h / bh / dh / yh是堰上的水头,b是闸门的宽度,d是闸门的高度,y是堰的底部与闸门上方的距离);放电系数为0·3-0·9。六个智能系统模型的精度分析表明,多层感知器模型是高级模型,其次是M5P模型,回归方程,径向基函数和广义回归神经网络模型。
更新日期:2020-09-08
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