Analysis of runoff pathways and flow contributions using deuterium and stream chemistry

Ogunkoya, O. O.; Jenkins, Alan

doi:10.1002/hyp.3360050307

Cited by 29 publications

(14 citation statements)

References 14 publications

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“…This is consistent with previous studies, which have shown that a two-component end-member mixing analysis (EMMA) can explain variations in a number of water quality parameters in the catchment (Ogunkoya and Jenkins, 1991;Soulsby et al, 1998), although three-component mixing may be more appropriate for explaining water quality variations during individual storm events (Ogunkoya and Jenkins, 1993). The seasonal in¯uence of precipitation inputs results in a temporally variable storm¯ow end-member that generally is characterized by relatively low d…”

Section: Hydrological Controls On Streamwater D 18 Osupporting

confidence: 88%

Isotope hydrology of the Allt a' Mharcaidh catchment, Cairngorms, Scotland: implications for hydrological pathways and residence times

et al. 2000

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Abstract:The O levels in various catchment waters provided a ®rst approximation of mean residence times in the major hydrological stores. Preliminary estimates are 0 . 2±0 . 8 years for near-surface soil water that contributes to storm runo and 2 and 45 years for shallow and deeper groundwater, respectively. These 18 O data sets provide further evidence that the in¯uence of groundwater on the hydrology and hydrochemistry of upland catchments has been underestimated.

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Section: Hydrological Controls On Streamwater D 18 Osupporting

confidence: 88%

Isotope hydrology of the Allt a' Mharcaidh catchment, Cairngorms, Scotland: implications for hydrological pathways and residence times

et al. 2000

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“…Runoff is likely to suffer less 'damping' of rainfall isotopic variability than aquifer discharge, though the effects are still fairly pronounced (e.g. Ogunkoya and Jenkins, 1991). Once these waters are exposed to the atmosphere in waterways or lakes, they are potentially subject to modification by evaporative fractionation (e.g.…”

Section: General Backgroundmentioning

confidence: 99%

The O and H stable isotope composition of freshwaters in the British Isles. 2. Surface waters and groundwater

Darling

Bath

Talbot

2003

Hydrol. Earth Syst. Sci.

233

171

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The utility of stable isotopes as tracers of the water molecule has a long pedigree. The study reported here is part of an attempt to establish a comprehensive isotopic 'baseline' for the British Isles as background data for a range of applications. Part 1 of this study (Darling and Talbot, 2003) considered the isotopic composition of rainfall in Britain and Ireland. The present paper is concerned with the composition of surface waters and groundwater. In isotopic terms, surface waters (other than some upland streams) are poorly characterised in the British Isles; their potential variability has yet to be widely used as an aid in hydrological research. In what may be the first study of a major British river, a monthly isotopic record of the upper River Thames during 1998 was obtained. This shows high damping of the isotopic variation compared to that in rainfall over most of the year, though significant fluctuations were seen for the autumn months. Smaller rivers such as the Stour and Darent show a more subdued response to the balance between runoff and baseflow. The relationship between the isotopic composition of rainfall and groundwater is also considered. From a limited database, it appears that whereas Chalk groundwater is a representative mixture of weighted average annual rainfall, for Triassic sandstone groundwater there is a seasonal selection of rainfall biased towards isotopically-depleted winter recharge. This may be primarily the result of physical differences between the infiltration characteristics of rock types, though other factors (vegetation, glacial history) could be involved. In the main, however, groundwaters appear to be representative of bulk rainfall within an error band of 0.5‰ δ 18 O. Contour maps of the δ 18 O and δ 2 H content of recent groundwaters in the British Isles show a fundamental SW-NE depletion effect modified by topography. The range of measured values, while much smaller than those for rainfall, still covers some 4‰ for δ 18 O and 30‰ for δ 2 H. Over lowland areas the 'altitude effect' is of little significance, but in upland areas is consistent with a range of -0.2 to -0.3‰ per 100 m increase in altitude. Groundwaters dating from the late Pleistocene are usually modified in δ 18 O and δ 2 H owing to the effects of climate change on the isotopic composition of rainfall and thus of recharge. Contour maps of isotopic variability prior to 10 ka BP, based on the relatively limited information available from the British Isles, allow a first comparison between groundwaters now and at the end of the last Ice Age. The position of the British Isles in the context of the stable isotope systematics of NW Europe is reviewed briefly.

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“…McDonnell et al (1990) have demonstrated the effect of varying rainfall isotopic composition on the validity of old-water/new-water estimates. Ogunkoya and Jenkins (1991), and Pionke et al (1993) conducted two-component hydrograph separation taking into account intra-storm isotopic variations in rainfall. Only a few studies, however, have evaluated how two-or three-component models are affected by intra-storm isotopic variation in rainfall.…”

Section: Introductionmentioning

confidence: 99%

Intra- and inter-storm oxygen-18 and deuterium variations of rain, throughfall, and stemflow, and two-component hydrograph separation in a small forested catchment in Japan

Kubota

Tsuboyama

2003

Journal of Forest Research

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Inter-and intra-storm oxygen-18 variations in rain, throughfall, and stemflow were measured to estimate accurate "new" water inputs to the watershed within a 0.84-ha watershed planted with 80-year-old Cryptomeria japonica and Chamaecyparis obutusa artificial forest at the Hitachi Ohta experimental watershed in Japan. In addition two-component hydrograph separation using oxygen-18 concentrations was conducted with four types of "new" water concentration: (1) incremental volume-weighted mean concentrations of rainfall; (2) constant concentrations of rainfall; (3) incremental volume-weighted mean concentrations of throughfall; and (4) constant concentrations of throughfall. Six storms from June to October 2000 were investigated. In the 26 July, 24 September, and 29 October storms, old-water percentages at the hydrograph peak were more than 56.4%, 66.6%, and 80.4%, respectively. In the 24 September and 29 October storms, the old-water contribution estimated by incremental volume-weighted mean concentrations of throughfall was the greatest. On the other hand, this was the smallest after the 26 July storm. Thus, by estimating the "new" water inputs more accurately, the "old" water contribution could be either large or small. In addition, there was a relative difference of about 5-10% between old water percentages calculated from the four types of "new" water. The uncertainty associated with the analysis of oxygen-18 concentrations was up to 4.8%. Thus the difference in estimates of "new" water affected the "old" water percentage more than the uncertainty of the two-component model itself.

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Analysis of runoff pathways and flow contributions using deuterium and stream chemistry

Abstract: The twocomponent hydrograph separation method has been used to investigate the sources of storm runofl at Allt a Mharcaidh during storms

Cited by 29 publications

References 14 publications

Isotope hydrology of the Allt a' Mharcaidh catchment, Cairngorms, Scotland: implications for hydrological pathways and residence times

Isotope hydrology of the Allt a' Mharcaidh catchment, Cairngorms, Scotland: implications for hydrological pathways and residence times

The O and H stable isotope composition of freshwaters in the British Isles. 2. Surface waters and groundwater

Intra- and inter-storm oxygen-18 and deuterium variations of rain, throughfall, and stemflow, and two-component hydrograph separation in a small forested catchment in Japan

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