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dc.contributor.authorBardsley, W. Earl
dc.contributor.authorCampbell, David I.
dc.date.accessioned2010-06-04T05:00:40Z
dc.date.available2010-06-04T05:00:40Z
dc.date.issued2007
dc.identifier.citationBardsley, W.E. & Campbell, D.I. (2007). An expression for land surface water storage monitoring using a two-formation geological weighing lysimeter. Journal of Hydrology, 335(3-4), 240-246.en_NZ
dc.identifier.urihttps://hdl.handle.net/10289/3930
dc.description.abstractField studies have demonstrated that ground surface rainfall accumulation can be detected at depth by synchronous increases in static confined groundwater pore pressures. This opens the way for “geological weighing lysimeters” providing disturbance-free water storage monitoring of the surface environment, in effect by weighing a significant land area in real time. Such systems require specific hydrogeological conditions, which are not easily verified by field observations and replicated observations from multiple geological formations are a prerequisite for quality control. Given replication over two monitored formations, we introduce an expression which utilises the respective formation piezometric water levels to give an improved combined estimate of the ground surface water budget. The expression utilises raw piezometric levels and has the advantage of direct correction for Earth tide noise, which may sometimes be influenced by local effects in addition to the pure solar/lunar tidal potential. The expression is particularly simple, if the two formations have similar (but possibly unknown) undrained Poisson ratios and porosities. Surface water budgets can then be estimated using only the respective formation barometric coefficients and piezometric levels. An example application to two vertically separated confined aquifers at a New Zealand site indicate an improved accuracy over single-formation observations. The two-formation expression for surface storage could find use as an accurate water budget tool with particular application to monitoring diffuse hydrological systems such as wetlands, arid regions, and heavily forested localities.en_NZ
dc.format.mimetypeapplication/pdf
dc.language.isoen
dc.publisherElsevieren_NZ
dc.rightsThis is an author’s accepted version of an article published in the journal: Journal of Hydrology. © 2007 Elsevier B.V.en_NZ
dc.subjectweighing lysimeteren_NZ
dc.subjectwater budgeten_NZ
dc.subjectstorage estimationen_NZ
dc.titleAn expression for land surface water storage monitoring using a two-formation geological weighing lysimeteren_NZ
dc.identifier.doi10.1016/j.jhydrol.2006.11.014en_NZ
dc.relation.isPartOfJournal of Hydrologyen_NZ
pubs.begin-page240en_NZ
pubs.elements-id34008
pubs.end-page246en_NZ
pubs.issue3-4en_NZ
pubs.volume335en_NZ


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