Internal Energy Dissipator in Highway Steep Box Culverts - Effectiveness of Roughness Elements at the End Part of the Culverts

Internal Energy Dissipator in Highway Steep Box Culverts - Effectiveness of Roughness Elements at the End Part of the Culverts

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© 2022 by IJETT Journal
Volume-70 Issue-12
Year of Publication : 2022
Author : Phong Nguyen Dang, Binh Hoang Nam, Huy Mai Quang, Thiep Nguyen Huy
DOI : 10.14445/22315381/IJETT-V70I12P241

How to Cite?

Phong Nguyen Dang, Binh Hoang Nam, Huy Mai Quang, Thiep Nguyen Huy, "Internal Energy Dissipator in Highway Steep Box Culverts - Effectiveness of Roughness Elements at the End Part of the Culverts," International Journal of Engineering Trends and Technology, vol. 70, no. 12, pp. 431-438, 2022. Crossref, https://doi.org/10.14445/22315381/IJETT-V70I12P241

Abstract
In the hydraulic design of steep highway culverts in mountainous areas, in addition to determining the size of culverts to drain the design discharge, the design of energy dissipators in the culvert body to reduce the size of the dissipators downstream of the culverts is also considered. Currently, in Vietnam, single broken-back culverts consisting of a steeper portion near the inlet and a followed mild slope section may be used as an internal energy dissipator for steep highway culverts or culverts as straight drops. In this study, a physical model was built by producing roughness elements at the end of the culverts to dissipate the outlet velocities with high energy. The study showed that the roughness elements played an important role in dissipating the flow energy at the outlet, remarkably, when the culvert slope ranged from 5% to 13%, and the proposal roughness elements reduced energy by over 50%.

Keywords
Roughness elements, Box culverts, Reduce flow velocity, Energy dissipator.

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