Uncertainty Analysis of a Dual-Continuum Model Used to Simulate Subsurface Hillslope Runoff Involving Oxygen-18 as Natural Tracer

Dohnal, Michal; Vogel, Tomáš; Šanda, Martin; Jelínková, Vladimíra

doi:10.2478/v10098-012-0017-0

Cited by 26 publications

(22 citation statements)

References 25 publications

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“…Under the given environmental conditions -high precipitation and humidity - and full vegetation cover (Dohnal et al, 2012;Vogel et al, 2010) only non-fractionating and advective water transport of isotopes is relevant.…”

Section: Windhorst Et Al: Stable Water Isotope Tracing Through Hymentioning

confidence: 99%

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Stable water isotope tracing through hydrological models for disentangling runoff generation processes at the hillslope scale

Windhorst¹,

Kraft²,

Timbe

et al. 2014

Hydrol. Earth Syst. Sci.

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Abstract. Hillslopes are the dominant landscape components where incoming precipitation becomes groundwater, streamflow or atmospheric water vapor. However, directly observing flux partitioning in the soil is almost impossible. Hydrological hillslope models are therefore being used to investigate the processes involved. Here we report on a modeling experiment using the Catchment Modeling Framework (CMF) where measured stable water isotopes in vertical soil profiles along a tropical mountainous grassland hillslope transect are traced through the model to resolve potential mixing processes. CMF simulates advective transport of stable water isotopes 18 O and 2 H based on the Richards equation within a fully distributed 2-D representation of the hillslope. The model successfully replicates the observed temporal pattern of soil water isotope profiles (R 2 0.84 and NashSutcliffe efficiency (NSE) 0.42). Predicted flows are in good agreement with previous studies. We highlight the importance of groundwater recharge and shallow lateral subsurface flow, accounting for 50 and 16 % of the total flow leaving the system, respectively. Surface runoff is negligible despite the steep slopes in the Ecuadorian study region.

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Section: Windhorst Et Al: Stable Water Isotope Tracing Through Hymentioning

confidence: 99%

“…Even though hypothesis I has previously been frequently used as an untested assumption for various models (e.g., Vogel et al, 2010;Dohnal et al, 2012), it is rarely scrutinized under natural conditions. A complete rejection of this hypothesis could therefore affect the interpretations in those studies and limit their applicability.…”

Section: Model Performancementioning

confidence: 99%

Stable water isotope tracing through hydrological models for disentangling runoff generation processes at the hillslope scale

Windhorst¹,

Kraft²,

Timbe

et al. 2014

Hydrol. Earth Syst. Sci.

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show abstract

“…The infiltration of water and air trapping was studied on intact samples of coarse sandy loam soil from a mountainous site (Cambisol series, Korkusova Hut, Sumava Mountains, Czech Republic) from a depth of 40 cm below the surface. Preferential and localized water flow often occurs in this soil (Dohnal et al, 2012), with the majority of the water utilizing the small fraction of the soil volume characterized by soil macropores, fractures, and high-porosity regions, which results in uneven weathering. The preferential flow can be numerically simulated by dual-continuum models (e.g., Gerke et al, 2007).…”

Section: Bimodal Imaging To Study Preferential Water Flow In Soilmentioning

confidence: 99%

Recent developments in neutron imaging with applications for porous media research

et al. 2016

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Abstract. Computed tomography has become a routine method for probing processes in porous media, and the use of neutron imaging is especially suited to the study of the dynamics of hydrogenous fluids, and of fluids in a highdensity matrix. In this paper we give an overview of recent developments in both instrumentation and methodology at the neutron imaging facilities NEUTRA and ICON at the Paul Scherrer Institut. Increased acquisition rates coupled to new reconstruction techniques improve the information output for fewer projection data, which leads to higher volume acquisition rates. Together, these developments yield significantly higher spatial and temporal resolutions, making it possible to capture finer details in the spatial distribution of the fluid, and to increase the acquisition rate of 3-D CT volumes. The ability to add a second imaging modality, e.g., X-ray tomography, further enhances the feature and process information that can be collected, and these features are ideal for dynamic experiments of fluid distribution in porous media. We demonstrate the performance for a selection of experiments carried out at our neutron imaging instruments.

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“…The retention curve parameters of the PF domain were also estimated based on indirect soil and plot characteristics. The sensitivity of the dual-continuum model to uncertainties associated with preferential flow parameters was studied by Dohnal et al (2012).…”

Section: Domainmentioning

confidence: 99%

Transport of iodide in structured clay-loam soil under maize during irrigation experiments analyzed using HYDRUS model

et al. 2014

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Transport of radioactive iodide131 I − in a structured clay loam soil under maize in a final growing phase was monitored during five consecutive irrigation experiments under ponding. Each time, 27 mm of water were applied. The water of the second experiment was spiked with 200 MBq of 131 I − tracer. Its activity was monitored as functions of depth and time with Geiger-Müller (G-M) detectors in 11 vertically installed access tubes. The aim of the study was to widen our current knowledge of water and solute transport in unsaturated soil under different agriculturally cultivated settings. It was supposed that the change in 131 I − activity (or counting rate) is proportional to the change in soil water content. Rapid increase followed by a gradual decrease in 131 I − activity occurred at all depths and was attributed to preferential flow. The iodide transport through structured soil profile was simulated by the HYDRUS 1D model. The model predicted relatively deep percolation of iodide within a short time, in a good agreement with the observed vertical iodide distribution in soil. We found that the top 30 cm of the soil profile is the most vulnerable layer in terms of water and solute movement, which is the same depth where the root structure of maize can extend.

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Uncertainty Analysis of a Dual-Continuum Model Used to Simulate Subsurface Hillslope Runoff Involving Oxygen-18 as Natural Tracer

Cited by 26 publications

References 25 publications

Stable water isotope tracing through hydrological models for disentangling runoff generation processes at the hillslope scale

Stable water isotope tracing through hydrological models for disentangling runoff generation processes at the hillslope scale

Recent developments in neutron imaging with applications for porous media research

Transport of iodide in structured clay-loam soil under maize during irrigation experiments analyzed using HYDRUS model

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