High-Resolution Rainfall Measurements Using a Portable X-Band Radar system

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dc.contributor.advisor Austin, Geoff en
dc.contributor.advisor Seed, Alan en
dc.contributor.author Nicol, John C en
dc.date.accessioned 2007-07-09T13:39:02Z en
dc.date.available 2007-07-09T13:39:02Z en
dc.date.issued 2001 en
dc.identifier THESIS 02-042 en
dc.identifier.citation Thesis (PhD--Physics)--University of Auckland, 2001 en
dc.identifier.uri http://hdl.handle.net/2292/741 en
dc.description Full text is available to authenticated members of The University of Auckland only. en
dc.description.abstract This thesis describes the operation and development of a portable, non-coherent, X-band weather radar operated by the Department of Physics, University of Auckland. This system has been deployed throughout New Zealand in a range of synoptic conditions. The suitability and limitations of this system in providing accurate, quantitative measurements of rainfall is assessed. The philosophy adhered to throughout this work is to operate the radar at a single elevation angle, which maximises the temporal resolution possible. This allows some further averaging to improve the accuracy of estimates and minimises the influence of storm development and motion between scans. The approach and methodology used to calibrate the system is described, along with methods which have been developed to monitor the quality of rainfall estimates and where necessary correct for known biases. These methods consist of a new means of limiting divergent attenuation estimates and novel applications of vertical profile and shielding corrections, which act to assess the suitability of a particular site. These methods are geared to short-range radar measurements and utilise the exceptional spatial (150m) and temporal resolution (5s) achieved. The procedures rue described and their ability to correct biased data is evaluated. It is not implied that X-band is a viable alternative for conventional radar operating at longer wavelengths, as the range of operation is of primary concern. However, when the range of operation is limited (<20km). accurate estimates of rainfall are shown to be possible at scales sensible for hydrological applications (500m and <5 min.). Beyond this, it is shown that estimated rainfields may be represented at a temporal resolution of l0 seconds with negligible influence from measurement errors. The factors biasing measurements may be identified and successively corrected for in all but the most severe cases. These findings suggest that low-cost X-band radar systems are a useful scientific and hydrological tool when operated at short-range in a temperate climate such as New Zealand's. The resolution achievable at close range allows for more accurate estimates of rainfall than may be achieved by the much slower sampling rates typical of weather radar even when operating at modest range (50km-l00km). en
dc.language.iso en en
dc.publisher ResearchSpace@Auckland en
dc.relation.ispartof PhD Thesis - University of Auckland en
dc.relation.isreferencedby UoA99100892014002091 en
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. en
dc.rights Restricted Item. Available to authenticated members of The University of Auckland. en
dc.rights.uri https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm en
dc.title High-Resolution Rainfall Measurements Using a Portable X-Band Radar system en
dc.type Thesis en
thesis.degree.discipline Physics en
thesis.degree.grantor The University of Auckland en
thesis.degree.level Doctoral en
thesis.degree.name PhD en
dc.rights.holder Copyright: The author en

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