Investigating the underestimation of rainfall measurement: impact of raingauge height and wind speed

Muchan, Katie. 2016 Investigating the underestimation of rainfall measurement: impact of raingauge height and wind speed. [Poster] In: 4th BHS International Conference, Cranfield University, 30 Aug - 1 Sept 2016. (Unpublished)

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The accurate measurement of rainfall data is vital for many aspects of hydrology, including the accurate estimation of water resources. However, the standard installation of raingauges with rims protruding above the ground surface results in a difference between this catch and the amount of rainfall reaching ground level. Wind disturbance, gauge shape and type of rainfall events have all been shown to impact on this difference, termed undercatch. The UK standard installation of both storage and tipping bucket raingauges has their rim cited at 30cm above the ground, however the use of weighing principle gauges, installed at a minimum of 1m above the ground surface, has increased in recent years. The installation of these raingauges raises complex questions of homogeneity given the simultaneous change to both the measurement technique and gauge height. The Centre for Ecology & Hydrology’s meteorological station at Wallingford (Oxfordshire) has historically operated parallel daily storage and tipping-bucket gauges installed at standard height and at ground level in pits. In April 2015, three weighing raingauges were installed at varying heights above the ground. Early results from the project will be presented, looking at the difference in catch between gauge height and instrument types and investigations into the relationship between rainfall catch and wind speed.

Item Type: Publication - Conference Item (Poster)
UKCEH and CEH Sections/Science Areas: Rees (from October 2014)
NORA Subject Terms: Hydrology
Meteorology and Climatology
Data and Information
Date made live: 02 Sep 2016 15:08 +0 (UTC)

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