Calibration of an oscillating nozzle-type rainfall simulator

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Title Calibration of an oscillating nozzle-type rainfall simulator
Author Yu, Bofu; Ciesiolka, Cyril A. A.; Langford, Paul
Journal Name Earth Surface Processes and Landforms
Year Published 2003
Place of publication United Kingdom
Publisher John Wiley & Sons Ltd.
Abstract Nozzle-type rainfall simulators are commonly used in hydrologic and soil erosion research. Simulated rainfall intensity, originating from the nozzle, increases as the distance between the point of measurement and the source is decreased. Hence, rainfall measured using rain gauges would systematically overestimate the rainfall received at the ground level. A simple model was developed to adjust rainfall measured anywhere under the simulator to plot-wide average rainfall at the ground level. Nozzle height, plot width, gauge diameter and height, and gauge location are required to compute this adjustment factor. Results from 15 runs at different rain intensities and durations, and with different rain gauge layouts, showed that a simple average of measured rain would overestimate the plot-wide rain by about 20 per cent. Using the adjustment factor to convert measured rainfall for individual gauges before averaging improved the estimate of plot-wide rainfall considerably. For the 15 runs considered, overall discrepancy between actual and measured rain is reduced to less than 1 per cent with a standard error of 0·97 mm. This model can be easily tested in the field by comparing rainfall depths of different sized gauges. With the adjustment factor they should all give very similar values. Copyright © 2003 John Wiley & Sons, Ltd.
Peer Reviewed Yes
Published Yes
Publisher URI
Alternative URI
Volume 28
Page from 1483
Page to 1490
ISSN 0197-9337
Date Accessioned 2004-03-20
Language en_AU
Faculty Faculty of Environmental Sciences
Subject PRE2009-Surfacewater Hydrology
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1

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