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Characterisation of building exposure to wind-driven rain in the UK and evaluation of current standards

Orr, SA; Viles, H; (2018) Characterisation of building exposure to wind-driven rain in the UK and evaluation of current standards. Journal of Wind Engineering and Industrial Aerodynamics , 180 pp. 88-97. 10.1016/j.jweia.2018.07.013. Green open access

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Abstract

One method of estimating WDR exposure is semi-empirical formulae based on hourly meteorological data including ISO 15927–3:2009 and BS 8104:1992. These provide protocols to estimate extreme WDR exposure, such as the worst spell likely to occur in any given three-year period. This study characterises the amount of annual WDR exposure and the frequency and duration of directional WDR spells for eight sites in the UK from 1986 to 2015. To assess the utility of these standards for evaluating extreme WDR exposure at those sites, the worst spell likely to occur in any given three-year period is determined using a ‘return period’ approach from extreme value analysis (EVA). It is shown that in the context of the prevailing wind patterns in the UK wall orientation is an important factor in determining the frequency and duration of WDR spell properties. EVA is applied for eight sites in the UK from 1959 to 1991 to evaluate the methods and climatic data used in BS 8104:1992 and their relevance to current climate. Both standards underestimate the volumetric exposure of the ‘once every three years’ spell compared to EVA for methodological reasons but are useful tools to assess annual exposure and compare between sites.

Type: Article
Title: Characterisation of building exposure to wind-driven rain in the UK and evaluation of current standards
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.jweia.2018.07.013
Publisher version: https://doi.org/10.1016/j.jweia.2018.07.013
Language: English
Additional information: © 2018 The Authors. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
Keywords: Wind-driven rain, Meteorology, Environmental monitoring, Extreme weather events, Moisture ingress, Building envelope
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of the Built Environment
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of the Built Environment > Bartlett School Env, Energy and Resources
URI: https://discovery.ucl.ac.uk/id/eprint/10063825
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