Journal ArticleDOI
Deuterium variations in storm rainfall: Implications for stream hydrograph separation
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In this article, two incremental approaches to rainfall weighting are presented, within-storm incremental weighting and standard weighting, which imposes a total storm rainfall value exogenously on the mass balance equation.Abstract:
Isotopic variation in storm rainfall is an important consideration in hydrograph separation using the mass balance approach but is rarely considered when determining the accuracy of old water estimates. Study of a small watershed on the South Island of New Zealand in which new water is a major component of the storm hydrograph shows that, in addition to the within-storm isotopic variations themselves, rainfall weighting techniques may substantially influence estimates of old/new water as a function of both total runoff and total quick flow production. Two incremental approaches to rainfall weighting are presented. Results show that within-storm incremental weighting is better than the standard weighting technique, which imposes a total storm rainfall value exogenously on the mass balance equation.read more
Citations
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Oxygen and hydrogen isotopes in the hydrologic cycle
TL;DR: In this article, the isotope fractionations that accompany the evaporation from the ocean and other surface waters and the reverse process of rain formation account for the most notable changes.
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Measuring methods for groundwater – surface water interactions: a review
TL;DR: An overview of the methods that are currently applied and described in the literature for estimating fluxes at the groundwater-surface water interface is given in this article, where several well-known methods exist for parameter estimation and process identification.
Journal ArticleDOI
A rationale for old water discharge through macropores in a steep, humid catchment.
TL;DR: In this article, the Maimai (M8) catchment was monitored in two discrete catchment positions for a series of storm events in 1987, and tensiometric response was related to the soil water characteristic curve, hillslope throughflow, and total catchment runoff.
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Isotope hydrograph separations and rapid delivery of pre-event water from drainage basins:
TL;DR: In this paper, environmental isotopes, such as oxygen-18 and deuterium, have been used increasingly to separate stormflow into its event and pre-event components in order to elucidate the sources, pathways and re...
Journal ArticleDOI
Hydrograph separation using stable isotopes: Review and evaluation
TL;DR: A review of the use of stable isotopes for hydrograph separation with particular reference to studies completed since the last comprehensive review in 1994 can be found in this paper, where the authors examine the role of soil water as a contributor to channel stormflow and the issues raised by differences in the soil water and groundwater signatures at watershed scale.
References
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Stable isotopes in precipitation
TL;DR: In this paper, the isotopic fractionation of water in simple condensation-evaporation processes is considered quantitatively on the basis of the fractionation factors given in section 1.2.
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Standard for Reporting Concentrations of Deuterium and Oxygen-18 in Natural Waters.
TL;DR: A standard, based on the set of ocean water samples used by Epstein and Mayeda to obtain a reference standard for oxygen-18 data, but defined relative to the National Bureau of Standards isotopic reference water sample, is proposed for reporting both deuterium and oxygen- 18 variations in natural watersrelative to the same water.
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The Role Of Groundwater In Storm Runoff
TL;DR: Sklash et al. as mentioned in this paper showed that groundwater plays a much more active, responsive and significant role in the generation, of storm and snow-melt runoff in streams than the recent literature on the subject suggests.
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Stable isotope fractionation due to evaporation and isotopic exchange of falling waterdrops: Applications to atmospheric processes and evaporation of lakes
TL;DR: In this article, the effects of evaporation and isotopic exchange on the deuterium and oxygen-18 contents of the drops were investigated in vertical streams of N2, Ar, or He gas with relative humidities of 0, 50, and 100%.
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Storm Runoff Generation in Humid Headwater Catchments: 1. Where Does the Water Come From?
TL;DR: Sklash et al. as mentioned in this paper reported a comprehensive set of hydrometric and natural tracer data for rainfall, soil water, and streamflow for catchments in the Tawhai State Forest, Westland, New Zealand, which reveal some of the important runoff processes.