Three-Dimensional Numerical Simulation Research on Discharge Characteristics of Storm-Drain Inlet in Low-Lying Areas

Ke Zhang, Jiake Li (), Lizhong Ning, Weifeng Xie, Yafang Li, Zakir Ullah and Kai Peng
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Ke Zhang: Xi’an University of Technology
Jiake Li: Xi’an University of Technology
Lizhong Ning: Xi’an University of Technology
Weifeng Xie: Xi’an University of Technology
Yafang Li: Xi’an University of Technology
Zakir Ullah: Xi’an University of Technology
Kai Peng: Xi’an University of Technology

Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), 2023, vol. 37, issue 13, No 16, 5273-5287

Abstract: Abstract Storm-drain inlets can lessen surface runoff and are essential for managing urban flooding. To fully grasp the storm-drain inlet discharge characteristics, a computational fluid dynamics (CFD) method was utilised to research. In this study, the discharge characteristics of 36 groups of storm-drain inlets with various water depths and flow velocities were simulated separately. This paper systematically analysed the distribution characteristics of flow patterns, streamlines and velocities of storm-drain inlets. The findings indicate that: the distribution of streamlines and the shape of the free water surface within the storm-drain inlet change significantly with increasing incoming water depth; the flow pattern in the vicinity of rainwater wells changes from the free weir flow to the submerged weir flow; the free water surface of the storm-drain inlet transitions from the state of being partially to entirely covered by water flow. The empirical formula between the discharge coefficient of the storm-drain inlet and the Froude number was constructed by dimensional analysis with a high correlation coefficient. And compared with other empirical formulas, the formula considers the effects of different factors on the discharge capacity of storm-drain inlets in a relatively comprehensive way. This research’s results help deepen the awareness of the discharge process at storm-drain inlets and have implications for guiding municipal flooding management.

Keywords: Urban flooding; Storm-drain inlet; Discharge characteristics; Numerical simulation; Dimensional analysis (search for similar items in EconPapers)
Date: 2023
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DOI: 10.1007/s11269-023-03605-x

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