1-D and 2-D Analysis of Flood Plain Encroachment

by James C. Thompson, Advanced Hydraulics River Modeling, United States,

Abstract: The paper reports on a study into the effects of a local encroachment in a broad regular flood plain. The results of a one-dimensional analysis were compared with the results of an equivalent two-dimensional analysis. For the conditions studied, the two-dimensional model predicted greater backwater, but the backwater tended to be more local than predicted by the one-dimensional model. The one-dimensional analysis was performed using HEC-2 which solves the energy equation to obtain the water depth and average velocity at successive cross sections. The two-dimensional analysis was performed using FESWMS-2DH, which solves the vertically integrated conservation of momentum equations and the conservation of mass (continuity) equation to obtain the depth-averaged velocities and water depth at points in a finite element network.

Subject Headings: Two-dimensional analysis | Flood plains | Two-dimensional models | Water conservation | Dimensional analysis | Backwater | Fluid velocity | Finite element method

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