Hydraulic and Hydrologic Analysis of Unsteady Flow in Prismatic Open Channel

Eugene Retsinis; Erna Daskalaki; Panos Papanicolaou

doi:10.20944/preprints201807.0626.v1

Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Version 1 : Received: 31 July 2018 / Approved: 31 July 2018 / Online: 31 July 2018 (14:27:25 CEST)

Comparison between hydraulic and hydrologic computational methods is conducted in this study, regarding prismatic open channels under unsteady subcritical flow conditions. One-dimensional unsteady flow continuity and momentum equations are solved using explicit and implicit finite difference schemes for a symmetrical trapezoidal cross section, where the flow discharge and depth are the dependent variables. The results have been compared to those derived from Muskingum-Cunge hydraulic/hydrologic method as well as the commercial software HEC-RAS. The results from explicit and implicit code compare well to those from commercial software and hydraulic/hydrologic methods for long prismatic channels, thus directing the hydraulic engineer to quick preliminary design of prismatic open channels for unsteady flow with satisfactory accuracy.

unsteady flow; dynamic wave; finite differences method; Muskingum-Cunge

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Hydraulic and Hydrologic Analysis of Unsteady Flow in Prismatic Open Channel

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