Hydrodynamics of long-duration urban floods: experiments and numerical modelling
-
Published:2016-06-16
Issue:6
Volume:16
Page:1413-1429
-
ISSN:1684-9981
-
Container-title:Natural Hazards and Earth System Sciences
-
language:en
-
Short-container-title:Nat. Hazards Earth Syst. Sci.
Author:
Arrault Anaïs, Finaud-Guyot Pascal, Archambeau Pierre, Bruwier Martin, Erpicum Sébastien, Pirotton Michel, Dewals BenjaminORCID
Abstract
Abstract. Flood risk in urbanized areas raises increasing concerns as a result of demographic and climate changes. Hydraulic modelling is a key component of urban flood risk analysis; yet, detailed validation data are still lacking for comprehensively validating hydraulic modelling of inundation flow in urbanized floodplains. In this study, we present an experimental model of inundation flow in a typical European urban district and we compare the experimental observations with predictions by a 2-D shallow-water numerical model. The experimental set-up is 5 m × 5 m and involves seven streets in each direction, leading to 49 intersections. For a wide range of inflow discharges, the partition of the measured outflow discharges at the different street outlets was found to remain virtually constant. The observations also suggest that the street widths have a significant influence on the discharge partition between the different streets' outlets. The profiles of water depths along the streets are mainly influenced by the complex flow processes at the intersections, while bottom roughness plays a small part. The numerical model reproduces most of the observed flow features satisfactorily. Using a turbulence model was shown to modify the length of the recirculations in the streets, but not to alter significantly the discharge partition. The main limitation of the numerical model results from the Cartesian grid used, which can be overcome by using a porosity-based formulation of the shallow-water equations. The upscaling of the experimental observations to the field is also discussed.
Publisher
Copernicus GmbH
Subject
General Earth and Planetary Sciences
Reference48 articles.
1. An, H., Yu, S., Lee, G., and Kim, Y.: Analysis of an open source quadtree grid shallow water flow solver for flood simulation, Quatern. Int., 384, 118–128, 2015. 2. Araud, Q.: Simulation des écoulements en milieu urbain lors d'un événement pluvieux extrême, PhD thesis, Université de Strasbourg, Strasbourg, 2012. 3. Bates, P. D., Horritt, M. S., and Fewtrell, T. J.: A simple inertial formulation of the shallow water equations for efficient two-dimensional flood inundation modelling, J. Hydrol., 387, 33–45, 2010. 4. Bazin, P. H.: Flows during floods in urban areas: influence of the detailed topography and the exchanges with the sewer system, PhD dissertation, Université Claude Bernard – Lyon I, Lyon, p. 293, 2013. 5. Bazin, P.-H., Nakagawa, H., Kawaike, K., Paquier, A., and Mignot, E.: Modeling flow exchanges between a street and an underground drainage pipe during urban floods, J. Hydraul. Eng., 140, 04014051, https://doi.org/10.1061/(ASCE)HY.1943-7900.0000917, 2014.
Cited by
38 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献
|
|