Evaluating wind-induced uncertainty on rainfall measurements by means of CFD modelling and field observations

M. Pollock, M. Colli, G. O'Donnell, A. Black, M. Stagnaro, M. Dutton, L. Lanza, P. Quinn, E. O’Connell

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Citations (Scopus)

Abstract

The most widely used device to measure rainfall is the tipping bucket rain gauge (TBR), although there is no standard design. The precision and accuracy of TBR measurements vary, and calibration procedures are dependent upon the organisation or institution operating a network. Consequently, rainfall datasets may be heterogeneous and not easily comparable. Environmental conditions at the gauge orifice also adversely influence the accuracy of measurement. The height at which the gauge is mounted has a significant influence on the gauge catch. Reference measurements can be made using a rain gauge in a pit structure, with the gauge orifice positioned at ground level. Different types of rainfall events, occurring in differing geographical and micro-topographical contexts, vary the influence of the wind on rainfall measurement. Hence, it is difficult to develop and apply an all encompassing correction procedure for wind using empirical observational methods alone. Computational Fluid Dynamics (CFD) provides an ideal framework within which to develop an understanding of how wind affects catch accuracy. Observational data from the field can be used to validate CFD simulations and enhance correction algorithms.
Original languageEnglish
Title of host publicationRainfall in urban and natural systems
Subtitle of host publicationProceedings of the 10th International Workshop on Precipitation in Urban Areas (UrbanRain15)
EditorsPeter Molnar, Nadav Peleg
Place of PublicationZürich
PublisherETH-Zürich, Institute of Environmental Engineering
Pages181-186
Number of pages6
DOIs
Publication statusPublished - 2015
EventUrbanRain15: 10th International Workshop on Precipitation in Urban Areas - Sporthotel Pontresina, Pontresina, Switzerland
Duration: 1 Dec 20155 Dec 2015
http://www.hyd.ifu.ethz.ch/news-and-events/news/2015/11/the-10th-international-workshop-on-precipitation-in-urban-areas.html

Workshop

WorkshopUrbanRain15
CountrySwitzerland
CityPontresina
Period1/12/155/12/15
Internet address

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