Comparison of the luminescence properties of waters depositing flowstone and stalagmites at Lower Cave, Bristol

Baker, Andy; Barnes, William

doi:10.1002/(sici)1099-1085(199807)12:9<1447::aid-hyp649>3.0.co;2-1

Cited by 22 publications

(3 citation statements)

References 25 publications

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“…Figure shows coefficient of variation of discharge plotted against maximum discharge for two different assumed drip volumes (0.15 or 0.37 ml drip −1 ). 0.15 ml drip −1 is a commonly cited drip volume (see Baker & Barnes, ; Baker & Smart, ; Baldini et al, ; and Fairchild et al, ), whereas 0.37 ml drip −1 is a drip volume based on a linear relationship between drip rate and drip volume identified by Genty and Deflandre (), who noted that drip volume increases as drip rate decreases. However, 0.37 ml drip −1 is unlikely to be correct for this site as drip rates observed here were much lower than those observed by Genty and Deflandre (), and it is unknown at what point the linear relationship fails.…”

Section: Resultsmentioning

confidence: 99%

“…Drip classification of the study speleothem after Smart and Friedrich (), where drip volume, coefficient of variation, and maximum discharge dictate the “class” of the drip. Dotted lines indicate drip classes from Baldini et al (), the black point indicates the coefficient of variation plotted against the maximum discharge with an assumed drip volume of 0.15 ml (based on Baker & Smart, ; Baker & Barnes, ; Baldini et al, ; and Fairchild et al, ), with the grey point based on a similar approach but adopts a potential drip volume of 0.37 ml based on Genty and Deflandre ()…”

Section: Resultsmentioning

confidence: 99%

“…Plotting the coefficient of variation of discharge against maximum discharge enables the inference of the hydrological pathways and potential palaeo‐climate proxy resolution. Although drip volume was not measured, two assumed values were used for this analysis; 0.15 ml drip −1 is a common volume (Baker & Barnes, ; Baker & Smart, ; Baldini et al, ; Fairchild et al, ), whereas 0.37 ml drip −1 was derived from a linear equation developed by Genty and Deflandre () who showed that, under low flow conditions, drip volume increased as drip rate decreased. The drip rate observed here was slower than that used by Genty and Deflandre (), and we assume the linear relationship holds for such slow discharge rates.…”

Section: Study Region and Methodsmentioning

confidence: 99%

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A multimethod approach to inform epikarst drip discharge modelling: Implications for palaeo‐climate reconstruction

Campbell

Callow

McGrath

et al. 2017

Hydrological Processes

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Resolving the hydrological processes that form speleothems and the palaeo‐climate archives that they contain is difficult. Typical approaches to hydrological investigation are not suited to karst landscapes, geophysics are seldom applied, drip monitoring and modelling have limitations, and ignoring potential hydrological impacts can result in a proxy record that does not reflect the external environment. We aim to understand the processes and controls that have created a palaeo‐climate proxy record preserved in a speleothem (JC001) in the “Grotto of Oddities,” part of the Jersey Cave at the Yarrangobilly Caves, Australia, to infer the likely nature and resolution of this record. Electrical resistivity tomography (ERT), traditional surveying, and drip discharge monitoring (April 2013 to February 2015) were used to investigate the structure and hydrology of the epikarst overlying the Grotto of Oddities. Data collected through these methods were then used to construct a physically informed and parsimonious drip hydrology model. Geophysics showed that changes in hillslope above the Grotto of Oddities are collocated with a region of low resistivity, which forms an epikarstic reservoir acting to supply enhanced discharge to the speleothem. Drip monitoring showed hysteretic behaviour with a distinct threshold response, and a simple drip classification indicated that the speleothem associated with the drip has the potential to record palaeo‐seasonality or an annual–decadal signal. Discharge modelling indicated discharge was comprised of quick and slow flow, and that discharge is probably perennial. These multimethod results together indicate that the speleothem likely represents a palaeo‐climate record of a length and resolution unprecedented for nonglacial areas of the Southern Hemisphere and for Australia in particular and will significantly enhance current knowledge of the climate of southeast Australia. Although ERT methods have previously been applied in the karst landscape, to our knowledge, this represents the first application of these multiple methods in combination as an approach to assess the fidelity of a speleothem, based on an understanding of the hydrological processes for palaeo‐climate reconstruction.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Study Region and Methodsmentioning

confidence: 99%

See 1 more Smart Citation

A multimethod approach to inform epikarst drip discharge modelling: Implications for palaeo‐climate reconstruction

Campbell

Callow

McGrath

et al. 2017

Hydrological Processes

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References

2012

Speleothem Science

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Stalactite drip rate variations controlled by air pressure changes: an example of non‐linear infiltration processes in the ‘Cueva del Agua’ (Spain)

Fernández-Cortés

Calaforra

Martos

et al. 2006

Hydrological Processes

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Abstract:A study of drip water from a stalactite in the Cueva del Agua (Granada, southern Spain) over four hydrological years has enabled a detailed characterization of infiltration through the non-saturated zone of this cave. The most significant aspects are:(1) The drip water regime is not seasonal, but is linked instead to slow infiltration. Sudden changes in the drip water regime are detected, due to infiltration along the preferential flow paths and the draining of water of supersaturated water reserves from the microfissure and pore system. (2) The accumulation of excess rain in the unsaturated zone dislodges the reserve of supersaturated water from the matrix of microfissures and pores, giving rise to an average increase in drip intensity of 2Ð2 š 0Ð5 mm h 1 and 37 š 13 µS cm 1 in the electrical conductivity of the water. (3) Time-series analysis of the drip water demonstrates a lack of linearity over time of the drip rate, indicating a chaotic regime. (4) When the dripping is constant, barometric oscillation of the air is the principal factor that causes the lack of linearity in the drip flow. In this way, over an average of 2-3 days, a mean variation of the air pressure inside the cave of 10 š 3Ð7 mbar causes a mean oscillation in the drip rate of 0Ð5 š 0Ð2 mm h 1 . This increase in air pressure is translated as an increase in the relative thickness of the gaseous phase of the drip water at the cost of the aqueous phase, so reducing the drip intensity of the stalactite.

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Comparison of the luminescence properties of waters depositing flowstone and stalagmites at Lower Cave, Bristol

Cited by 22 publications

References 25 publications

A multimethod approach to inform epikarst drip discharge modelling: Implications for palaeo‐climate reconstruction

A multimethod approach to inform epikarst drip discharge modelling: Implications for palaeo‐climate reconstruction

References

Stalactite drip rate variations controlled by air pressure changes: an example of non‐linear infiltration processes in the ‘Cueva del Agua’ (Spain)

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