Papers by Alain Joel Elong
Journal of Hydraulic Research
Applied Sciences
As a result of urbanization, combined with the anthropogenic effects of climate change, natural e... more As a result of urbanization, combined with the anthropogenic effects of climate change, natural events such as floods are showing increasingly adverse impacts on human existence. This study proposes a new model, based on shallow water equations, that is able to predict these floods and minimize their impacts. The first-order finite volume method (FVM), the Harten Lax and van Leer (HLL) scheme, and the monotone upwind scheme for conservation laws (MUSCL) are applied in the model. In addition, a virtual boundary cell approach is adopted to achieve a monotonic solution for both interior and boundary cells and flux computations at the boundary cells. The model integrates the infiltration parameters recorded in the area, as well as the Manning coefficient specific to each land-cover type of the catchment region. The results provided were mapped to highlight the potential flood zones and the distribution of water heights throughout the catchment region at any given time, as well as that a...
38th IAHR World Congress - "Water: Connecting the World", 2019
This work investigates the effects of unsteady friction in a rapid filling pipeline with an entra... more This work investigates the effects of unsteady friction in a rapid filling pipeline with an entrapped air pocket. Existing one-dimensional transient pipe-filling models have primarily considered only steady friction factors, but these same models have tended to underestimate the rate of attenuation of the pressure oscillations. Brunone's unsteady friction model is combined here with both local inertia and wall friction effects to predict pressure fluctuations using the method of characteristics. Two approaches, Vardy's analytically deduced shear decay coefficient and the traditional trial and error method, are used to determine the Brunone's friction coefficient k. Numerical results predicted by the steady friction model, the quasi-steady friction model and the unsteady friction model are compared to each other and to the results obtained from laboratory measurements in a rapidly filling vertical pipe containing an entrapped air pocket. The models that account for unsteady friction are shown to better reproduce measured pressure oscillations.
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Papers by Alain Joel Elong