Journal of the Meteorological Society of Japan. Ser. II
Online ISSN : 2186-9057
Print ISSN : 0026-1165
ISSN-L : 0026-1165
A Preliminary Investigation of Orographic Rainfall Enhancement over Low Hills near Auckland New Zealand
David StowStuart BradleyWarren Gray
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1991 Volume 69 Issue 4 Pages 489-495

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Abstract

A very dense network of recording rain-gauges spaced at intervals of about one kilometre extended from the west coast at sea level to an altitude of 400 m and 13 km inland. Catches at each site were compared under conditions when rain was generally widespread both for prevailing offshore and on-shore winds. Rainfall was evaluated in terms of total catch per rain period, the distribution of rainfall intensities within each rain period, and correlations of intensities between individual gauges. Consistent with seeder-feeder theories, the catch was found to increase with distance from the coast. However, short-term rainfall intensities at pairs of sites were highly correlated and not subject to the non-linear dependence on the absolute value of the rainfall intensity noted by previous workers studying total catches. Catch ratios of up to 3:1 were measured for offshore winds.

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