| 雨水口堵塞程度对其泄流能力影响的试验研究 |
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| 引用本文： | 夏军强,陈倩,董柏良,张晓雷.雨水口堵塞程度对其泄流能力影响的试验研究[J].水科学进展,2020,31(6):843-851. |
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| 作者姓名： | 夏军强 陈倩 董柏良 张晓雷 |
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| 作者单位： | 武汉大学水资源与水电工程科学国家重点实验室, 湖北 武汉 430072;武汉大学水资源与水电工程科学国家重点实验室, 湖北 武汉 430072;华北水利水电大学水利学院, 河南 郑州 450011 |
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| 基金项目： | 国家自然科学基金资助项目41890823国家自然科学基金资助项目51725902 |
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| 摘 要： | 雨水口是下泄地表径流的关键设施，一旦堵塞将导致市政排水系统的泄流能力无法充分发挥，这是引发城市洪涝灾害的主要原因之一。为定量分析雨水口堵塞对其泄流能力的影响，本研究分别考虑进水篦及连接管不同堵塞程度的情况，开展了较大来流水深下的概化水槽试验，共计进行了608组试验。试验结果表明:①进水篦及连接管堵塞均会显著影响雨水口的泄流能力，且后者对雨水口泄流能力的影响更大。②利用试验数据率定了各堵塞情况下水流以堰流或管嘴流形式从雨水口下泄时的流量系数；基于量纲分析及回归分析，给出了各堵塞情况下雨水口泄流能力的幂函数表达式，并利用试验数据对参数进行了率定，率定效果优于堰流或管嘴流公式。③通过与未堵塞情况进行比较，基于幂指数均值假定及非线性拟合方法，建立堵塞系数与堵塞程度之间的经验关系，并最终提出了一个可以分别考虑进水篦与连接管堵塞影响的雨水口泄流能力公式；该公式可以考虑雨水口堰流及管嘴流等不同泄流形式，能够反映进水篦、连接管不同堵塞程度的影响，适用于来流水深较大的情况。
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| 关 键 词： | 雨水口堵塞 泄流能力 模型试验 城市洪涝 |
| 收稿时间： | 2019-09-30 |
Experimental study on the effect of clogging on the inlet discharge capacity |
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| Institution: | 1.State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China2.School of Water Conservancy, North China University of Water Resources and Electric Power, Zhengzhou 450011, China |
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| Abstract: | Street inlet is one of the key facilities in urbran drainage systems. Once street inlets are clogged, the surface water cannot be discharged efficiently into the underground pipes, which is one of the main reasons for the occurrence of severe urban flooding. In order to quantitatively investigate the influence mechanism and degree of street inlet clogging on its discharge capacity, experiments were carried out in a specific laboratory flume based on the condition of large incoming water depths, considering different clogging degrees of grate and lateral side tube respectively. A total of 608 groups of steady flow experiments were conducted. Experimental results show that the clogging of both grate and side tube can significantly influence the comprehensive discharge capacity of a street inlet, with the clogging of side tube having a more pronounced effect. The discharge coefficients were determined for weir and nozzle flows using these experimental data. Based on the dimensional analysis and the regression method, the formula of inlet discharge capacity expressed by a power function of clogging degree was proposed, and the coefficients were calibrated by experimental results. These results show that the latter calibrations based on the power function expression are better than that for the weir or nozzle formulae. The relationships between clogging coefficient and clogging degree were proposed respectively for inlet and side tube clogging, based on the non-linear fitting method and mean assumption of the power exponent. The unified formula for discharge capacity of street inlet was finally established, which can not only account for the weir and nozzle flow patterns, but also can reflect the effect of different clogging degrees of grate and side tube, and the proposed formula is applicable to large incoming water depths |
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