Abstract To divert water from rivers, several structures can be employed. Bottom intake is one of the hydraulic structures which is generally used for this purpose in steep streams. Bottom racks are associated with the problems such as deformation, corrosion, vibration and clogging by foliage, sediments, and freezing. A new type of bottom intakes is introduced to overcome these difficulties in which the racks are replaced by a trench filled with a coarse porous medium. In the present study, we analyze the experimental results of a systematic series of measurements conducted in a two-storey laboratory flume. Measuring the diverted discharge is done alongside other important factors such as grain size distributions, total and remained discharges, velocity, and intake geometric properties. Furthermore, the results of our experiments are compared with those obtained from the formulas proposed in previous studies. The hydraulic characteristics of these formulas are investigated, and the necessary points for their improvement are determined. Also, we introduce new formulas for estimating discharge coefficient and diversion rate based on dimensional analysis, our experimental data, and multivariate regression. The validation of these formulas is verified through the hydraulic principles describing intake behaviors and statistical verification tests. Comparison between the calculated data and our measurements shows that the proposed formulas are in good agreement with the experimental results.

中文翻译：

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非沉积物流多孔底部取水口导流率估算的试验研究

摘要 为了从河流引水，可以采用多种结构。底部进水口是一种水力结构，通常在陡峭的溪流中用于此目的。底架与变形、腐蚀、振动和树叶堵塞、沉积物和冻结等问题有关。引入了一种新型底部进水口来克服这些困难，其中机架被填充有粗多孔介质的沟槽代替。在本研究中，我们分析了在两层实验室水槽中进行的一系列系统测量的实验结果。测量分流排放量与其他重要因素一起进行，例如粒度分布、总排放量和剩余排放量、速度和进水几何特性。此外，我们的实验结果与从先前研究中提出的公式获得的结果进行了比较。研究了这些公式的水力特性，并确定了改进它们的必要点。此外，我们引入了基于量纲分析、我们的实验数据和多元回归来估算流量系数和分流率的新公式。这些公式的验证通过描述进气行为的液压原理和统计验证测试进行验证。计算数据与我们的测量值之间的比较表明，所提出的公式与实验结果非常吻合。并确定改进的必要点。此外，我们引入了基于量纲分析、我们的实验数据和多元回归来估算流量系数和分流率的新公式。这些公式的验证通过描述进气行为的液压原理和统计验证测试进行验证。计算数据与我们的测量值之间的比较表明，所提出的公式与实验结果非常吻合。并确定改进的必要点。此外，我们引入了基于量纲分析、我们的实验数据和多元回归来估算流量系数和分流率的新公式。这些公式的验证通过描述进气行为的液压原理和统计验证测试进行验证。计算数据与我们的测量值之间的比较表明，所提出的公式与实验结果非常吻合。这些公式的验证通过描述进气行为的液压原理和统计验证测试进行验证。计算数据与我们的测量值之间的比较表明，所提出的公式与实验结果非常吻合。这些公式的验证通过描述进气行为的液压原理和统计验证测试进行验证。计算数据与我们的测量值之间的比较表明，所提出的公式与实验结果非常吻合。