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首页> 外文期刊>Water science & technology >Discharge coefficient of a broad crested side weir in an earthen channel
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Discharge coefficient of a broad crested side weir in an earthen channel

机译：土质通道中宽顶侧堰的流量系数。

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摘要

Side weirs are widely used to divert flows from rivers and channels. However, the hydraulic behavior of this type of weir is complex and difficult to predict accurately. Previous studies on side weirs have generally focused on side weirs in rectangular channels with a smooth bed. However, one of the applications of side weirs is in irrigation systems which have trapezoidal cross sections and significant bed roughness. The present study investigates the hydraulic behavior of a broad crested side weir in an earthen channel with a rough bed under subcritical flow. These investigations showed that the side weir discharge coefficient is influenced by four main parameters which are upstream Froude number, ratio of the main channel width to the upstream flow depth, ratio of the length of the side weir to the main channel width and ratio of side weir height to the upstream flow depth. The results showed that the discharge coefficient of the side weir gives a lower coefficient value compared to other researchers' equations. Nearly 90 experimental tests were carried out and finally new equations are proposed for prediction of discharge coefficient of a broad crested side weir in an earthen channel under subcritical conditions which can be mainly used in common irrigation systems.
机译：侧堰被广泛用于转移河流和河道的水流。然而，这种类型的堰的水力行为是复杂的并且难以准确地预测。先前关于侧围堰的研究通常集中在具有光滑床的矩形通道中的侧围堰。然而，侧堰的应用之一是在灌溉系统中，该系统具有梯形横截面和明显的床面粗糙度。本研究调查了在亚临界流下具有粗糙床层的土质通道中宽顶冠堰的水力行为。这些研究表明，侧堰溢流系数受四个主要参数的影响，这些参数是上游弗洛德数，主通道宽度与上游流动深度之比，侧堰长度与主通道宽度之比和侧边之比。堰高至上游水流深度。结果表明，与其他研究人员的方程相比，侧堰的排放系数给出的系数值更低。进行了近90个实验测试，最后提出了新的方程式，用于预测亚临界条件下土渠中宽顶side的流量系数，该方程主要用于常见的灌溉系统。

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