Numerical Modeling Of One-Dimensional Overland Flow Over Porous Surface
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Date
2019-05-01
Authors
Tah, Ai Sher
Journal Title
Journal ISSN
Volume Title
Publisher
Universiti Sains Malaysia
Abstract
Due to rapid urbanization, surface water drainage systems are designed to
perform as natural drainage acting as water storage areas that allow infiltration and
evaporation. Furthermore, in order to solve issues caused by traditional drainage
systems, there has been an increase of attention on Sustainable Urban Drainage
systems (SuDs). Thus, to manage storm water, a simple yet efficient numerical
model for flow over porous media is needed. The purpose of this research is to
develop a numerical model for the simulation of flow over porous media. The model
solves the unsteady one-dimensional shallow water equation. The accuracy of the
numerical solution of the advection term in the momentum equation is increased by
adopting the Constrained Interpolation Profile (CIP) scheme which is of the third
order accuracy. The numerical model was firstly verified by simulating the dam-break flow problem. It was then validated against physical experiment of dam-break
flow over porous bed. The author found that the numerical model performed
satisfactorily in terms of surface flow profile and the loss of volume of flow through
infiltration. This study found that the relationship of experimental data and numerical
data has good agreement between each other with a discrepancy ratio of
experimental data over numerical data ranging from 0.716 to 1.031. Besides, the
flow front propagation is proportional to time with the 4/5 exponent power of
(𝑙 ∝ 𝑡45⁄). The outcome of this study can help to provide better accuracy when
designing a sustainable urban drainage system (SuDs) with porous media.