IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
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You are here : eLibrary : IAHR World Congress Proceedings : 34th Congress - Brisbane (2011) : THEME 5: Environmental Hydraulics and Hydrology : Porosity model of flow through an idealised urban district influence of city alignment and of transi...
Porosity model of flow through an idealised urban district influence of city alignment and of transient flow character
Author : M. Velickovic, S. Soares-Frazão and Y. Zech
In the prediction of water levels and velocities in cities subject to severe floods, various levels of accuracy might be required: for detailed results inside the city a full 2D model representing streets and buildings is preferable; but such a detailed model is useless to assess the flow pattern outside the city. In the latter case, where the whole city is considered as an obstacle to the flow, a porosity model may be suitable, as far as a drag coefficient is used to account for additional head losses. Laboratory tests were conducted under two types of flow conditions: steady and dam-break flow. A set of 5 × 5 square blocks were used to represent the buildings. The streets were either aligned, or presenting an angle of 22.5° with the main flow directions. It was observed that the drag coefficient was practically insensitive to the transient character of the flow but much more to the alignment.
File Size : 975,065 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 34th Congress - Brisbane (2011)
Article : THEME 5: Environmental Hydraulics and Hydrology
Date Published : 01/07/2011
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