Global Isotope Hydrogeology―Review

Jasechko, Scott

doi:10.1029/2018rg000627

Cited by 217 publications

(180 citation statements)

References 1,434 publications

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“…The same basic data sources are cited again here. However, we now address interception and the distinction between subsurface and surface run-off, requiring reference to a suite of results [57][58][59][60][61][62] for the magnitude of the interception term, as well as a comprehensive review [63] on the relative contributions of surface and sub-surface run-off to Q.…”

Section: Data Sourcesmentioning

confidence: 99%

“…In any case, if one makes this assumption, D = a ( P -EP − Q surf ) + b Q surf , where a and b are unknown constants of proportionality. The subsurface component of run-off is typically larger than the surface component [63]. However, the fluxes in rivers from chemical weathering are typically smaller than those from physical erosion processes.…”

Section: Extending Budyko Theorymentioning

confidence: 99%

“…Using a midpoint of the range of l t values cited by [61], and using Lvovitch's value for surface run-off, Equation (10) yields 59-60% for ET . However, [63] reported a considerably higher fraction of streamflow traceable to groundwater ("most streamflow derives from groundwater discharges, for most rivers, most of the time"), with mean values as high as 80%. Thus, we use a range of subsurface flows that constitute between 40% and 80% of the total run-off.…”

Section: Extending Budyko Theorymentioning

confidence: 99%

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Predicting Water Cycle Characteristics from Percolation Theory and Observational Data

Hunt

Faybishenko

Ghanbarian

et al. 2020

IJERPH

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The fate of water and water-soluble toxic wastes in the subsurface is of high importance for many scientific and practical applications. Although solute transport is proportional to water flow rates, theoretical and experimental studies show that heavy-tailed (power-law) solute transport distribution can cause chemical transport retardation, prolonging clean-up time-scales greatly. However, no consensus exists as to the physical basis of such transport laws. In percolation theory, the scaling behavior of such transport rarely relates to specific medium characteristics, but strongly to the dimensionality of the connectivity of the flow paths (for example, two- or three-dimensional, as in fractured-porous media or heterogeneous sediments), as well as to the saturation characteristics (i.e., wetting, drying, and entrapped air). In accordance with the proposed relevance of percolation models of solute transport to environmental clean-up, these predictions also prove relevant to transport-limited chemical weathering and soil formation, where the heavy-tailed distributions slow chemical weathering over time. The predictions of percolation theory have been tested in laboratory and field experiments on reactive solute transport, chemical weathering, and soil formation and found accurate. Recently, this theoretical framework has also been applied to the water partitioning at the Earth’s surface between evapotranspiration, ET, and run-off, Q, known as the water balance. A well-known phenomenological model by Budyko addressed the relationship between the ratio of the actual evapotranspiration (ET) and precipitation, ET/P, versus the aridity index, ET0/P, with P being the precipitation and ET0 being the potential evapotranspiration. Existing work was able to predict the global fractions of P represented by Q and ET through an optimization of plant productivity, in which downward water fluxes affect soil depth, and upward fluxes plant growth. In the present work, based likewise on the concepts of percolation theory, we extend Budyko’s model, and address the partitioning of run-off Q into its surface and subsurface components, as well as the contribution of interception to ET. Using various published data sources on the magnitudes of interception and information regarding the partitioning of Q, we address the variability in ET resulting from these processes. The global success of this prediction demonstrated here provides additional support for the universal applicability of percolation theory for solute transport as well as guidance in predicting the component of subsurface run-off, important for predicting natural flow rates through contaminated aquifers.

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Section: Data Sourcesmentioning

confidence: 99%

Section: Extending Budyko Theorymentioning

confidence: 99%

Section: Extending Budyko Theorymentioning

confidence: 99%

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Predicting Water Cycle Characteristics from Percolation Theory and Observational Data

Hunt

Faybishenko

Ghanbarian

et al. 2020

IJERPH

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“…Yet, in many studies focusing on the groundwater compartment, age is set zero, as water enters the groundwater system and does not include the age information during recharge. Consequently, reviews until now have dealt with water age estimates for individual compartments, such as the soil (Sprenger, Leistert, et al, ) or the groundwater (Cartwright et al, ; Jasechko, ; McCallum et al, ; Suckow, ; Suckow et al, ; Turnadge & Smerdon, ), or focused on the catchment scale (Birkel & Soulsby, ; Hrachowitz et al, ; McGuire & McDonnell, ).…”

Section: Introductionmentioning

confidence: 99%

The Demographics of Water: A Review of Water Ages in the Critical Zone

Sprenger

Stumpp

Weiler

et al. 2019

Reviews of Geophysics

233

214

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The time that water takes to travel through the terrestrial hydrological cycle and the critical zone is of great interest in Earth system sciences with broad implications for water quality and quantity. Most water age studies to date have focused on individual compartments (or subdisciplines) of the hydrological cycle such as the unsaturated or saturated zone, vegetation, atmosphere, or rivers. However, recent studies have shown that processes at the interfaces between the hydrological compartments (e.g., soil‐atmosphere or soil‐groundwater) govern the age distribution of the water fluxes between these compartments and thus can greatly affect water travel times. The broad variation from complete to nearly absent mixing of water at these interfaces affects the water ages in the compartments. This is especially the case for the highly heterogeneous critical zone between the top of the vegetation and the bottom of the groundwater storage. Here, we review a wide variety of studies about water ages in the critical zone and provide (1) an overview of new prospects and challenges in the use of hydrological tracers to study water ages, (2) a discussion of the limiting assumptions linked to our lack of process understanding and methodological transfer of water age estimations to individual disciplines or compartments, and (3) a vision for how to improve future interdisciplinary efforts to better understand the feedbacks between the atmosphere, vegetation, soil, groundwater, and surface water that control water ages in the critical zone.

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“…The average deuterium excess for precipitation is 8.4‰, whereas it is 2.3‰ for groundwater, suggesting that there is relatively uniform evaporation during recharge (soil water infiltration through the unsaturated zone). This phenomenon is commonly observed in dry climates (Jasechko, 2019).…”

Section: Resultsmentioning

confidence: 84%

Impact of Afforestation on Atmospheric Recharge to Groundwater in a Semiarid Area

et al. 2020

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While the global forest area is generally decreasing, various afforestation projects have been implemented, including the large-scale Three-North Afforestation Program (TNAP) and the Conversion of Cropland to Forest Program in China, under which 0.63 million square kilometers of trees have been planted. The large-scale land use and cover change (LUCC) would affect the redistribution of precipitation and change the water cycle, especially groundwater recharge. The chloride mass balance (CMB) between precipitation and soil water/groundwater is the most widely used technique to estimate the recharge in arid and semiarid areas. However, in the case of decreased recharge following LUCC, a new equilibrium of water and chloride flux is not easily reached and the identification of steady state is the premise to use CMB. This study provided a method to assess the steady state by comparing the history of LUCC and chloride cumulative age at sampling depth and by checking the breaks in the slope of the line for cumulative chloride and soil water. The case study in the Mu Us Sandy Land, affected by the TNAP, shows that soil profiles beneath sparse grassland, shrubland, and woodland have reached steady state. However, new equilibrium has not been reached in the soil profiles beneath the dense shrubland. The estimated recharge rates beneath the plantations represent reductions from 33% to >90% relative to the surrounding bare sandy land (50-54 mm/year). The results highlight the unfavorable effects of some afforestation and ecological rehabilitation approaches in arid and semiarid areas on regional groundwater resources.

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Global Isotope Hydrogeology―Review

Cited by 217 publications

References 1,434 publications

Predicting Water Cycle Characteristics from Percolation Theory and Observational Data

Predicting Water Cycle Characteristics from Percolation Theory and Observational Data

The Demographics of Water: A Review of Water Ages in the Critical Zone

Impact of Afforestation on Atmospheric Recharge to Groundwater in a Semiarid Area

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