利用不完全自相似(ISS)技术研究淹没工况下宽顶堰的级流量关系

Rawaa Toama, M. Shamkhi
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摘要

宽顶堰是最简单、最古老的水工构筑物之一。用于测量流量、调节水流深度和控制洪道。明渠流量测量要求是基于所进行的实验来评估经验流量系数和方程。本研究的目的是利用不完全自相似理论和传统的计算流量系数(Cds)的方法来建立阶段-流量关系,并确定哪种方法最有效。所有实验均在横截面为(0.5 × 0.5) m、长度为15 m的河道中进行。在淹没水流条件下,在25个圆边宽顶堰物理模型上进行了125次实验。结果表明,通过对两种方法的比较,并通过计算排放的平均绝对相对误差(MARE)。使用不完全自相似理论等于(4.25%),使用传统方法等于(7.05)。因此,不完全自相似公式比其他方法更准确。
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Stage-Discharge Relationships of Broad Crested Weir for submerged Flow Condition Utilizing Incomplete Self-Similarity(ISS) Technique
Abstract A broad-crested weir is one of the simplest and oldest hydraulic structures.It was used to measure flow regulate flow depth and control flood passage. Open channel flow measurement requirements are based on the experiments performed to evaluate the empirical discharge coefficients and equations. The aim of this study is to develop the stage-discharge relationships using incomplete self-similarity theory and traditional methods for calculating the discharge coefficient (Cds) and to determine which method is the most effective. All experiments were carried out in a channel  with a cross-section of (0.5 × 0.5) m and a length of 15 m. 125 experiments were carried out on 25 physical models of a broad crested weir with a rounded edge, under submerged flow conditions. The results showed, after comparing the two methods, and by calculating the mean absolute relative error (MARE) for discharges . It is equal to (4.25%) using the incomplete self-similarity theory, and it is equal to (7.05) by using the traditional method. Thus, the incomplete self-similarity formula is more accurate than the other method.
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