Improved geohydraulic characterization of river bed sediments based on freeze-core sampling – Development and evaluation of a new measurement approach

Strasser, Daniel; Lensing, Hermann-Josef; Nuber, Thomas; Richter, Dominik; Frank, Simon; Goeppert, Nadine; Goldscheider, Nico

doi:10.1016/j.jhydrol.2015.04.074

Cited by 10 publications

(20 citation statements)

References 24 publications

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“…The impact of this sampling technique on the soil structure integrity and especially the disturbance related to the insertion of the freezing lance within the soil has already been observed and discussed (Franchini and Zeyer, 2012;Niederreiter and Steiner, 1999;Strasser et al, 2015). However, because of a lack of non-destructive means to observe the 3D internal soil structure, only an approximate estimation of the zone of disturbance could be provided.…”

Section: Freeze-coring and Structural Integritymentioning

confidence: 99%

“…They did not use soil within a distance of 1 cm from the freezing lance for their subsequent analysis. Strasser et al (2015) mentioned that structural disturbances might range between 3 and 6 cm from the freezing lance. While such approximate estimations of the distance of disturbance might be sufficient in texturally and structurally homogeneous soils or sediments, the high variability of the amplitude of the disturbance observed in Figs.…”

Section: Freeze-coring and Structural Integritymentioning

confidence: 99%

“…It also found applications in soil science and for the analysis of the hyporheic zone, for example for the identification of the vertical distribution of microbial communities or chemical pollutants (Franchini and Zeyer, 2012;Gan et al, 2006;Moser et al, 2003). In a more recent study, Strasser et al (2015), used the freeze-cores for the geohydraulic characterization of river bed sediments.…”

Section: Introductionmentioning

confidence: 99%

“…The insertion of the freezing lance into the soil is leading to an ineluctable process-related structural disturbance due to the displacement and compaction of the soil beneath the lance. This disturbance of the soil structure at the proximity of the freezing lance has already been observed and to avoid biased results, a non-sampling zone around the lance has often been defined (Franchini and Zeyer, 2012;Strasser et al, 2015). In order to sample undisturbed areas within the freeze-core, Strasser et al (2015) first melted the core and then used a core-cutter to extract subsamples at sufficient distance from the lance and observed that this procedure did not affect the integrity of the soil structure.…”

Section: Introductionmentioning

confidence: 99%

“…This disturbance of the soil structure at the proximity of the freezing lance has already been observed and to avoid biased results, a non-sampling zone around the lance has often been defined (Franchini and Zeyer, 2012;Strasser et al, 2015). In order to sample undisturbed areas within the freeze-core, Strasser et al (2015) first melted the core and then used a core-cutter to extract subsamples at sufficient distance from the lance and observed that this procedure did not affect the integrity of the soil structure. However, in heterogeneous soils as studied here, this procedure could potentially lead to structural disturbances related to the thawing and the mechanical extraction of subsamples.…”

Section: Introductionmentioning

confidence: 99%

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Coupling X-ray computed tomography and freeze-coring for the analysis of fine-grained low-cohesive soils

et al. 2017

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A B S T R A C TThis paper presents the coupling of freeze-core sampling with X-ray CT scanning for the analysis of the soil structure of fine-grained, low-cohesive soils. We used a medical scanner to image the 3D soil structure of the frozen soil cores, providing X-ray CT data at a millimetric resolution over freeze-cores that are up to 62.5 cm long and 25 cm wide. The obtained data and the changes in gray level values could be successfully used to identify and characterize different soil units with distinctly different physical properties. Traditional measurements of soil bulk density, carbon and particle size analyses were conducted within each of the identified soil units. These observations were used to develop a 3D model of soil bulk density and organic matter distribution for five freeze-cores obtained at a restored floodplain in Switzerland. The millimetric X-ray CT scanning was applied to detect the impact of freeze-coring on the soil structural integrity. This allows identifying undisturbed zones, a critical precondition for any subsequent assessment of soil structure. The proposed coupling is thought to be applicable to a wide range of other low-cohesive soil types and has a large potential for applications in hydrogeology, biology or soil science.

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Section: Freeze-coring and Structural Integritymentioning

confidence: 99%

Section: Freeze-coring and Structural Integritymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Coupling X-ray computed tomography and freeze-coring for the analysis of fine-grained low-cohesive soils

et al. 2017

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Advances in understanding river‐groundwater interactions

Brunner

Therrien

Renard

et al. 2017

Reviews of Geophysics

189

126

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River‐groundwater interactions are at the core of a wide range of major contemporary challenges, including the provision of high‐quality drinking water in sufficient quantities, the loss of biodiversity in river ecosystems, or the management of environmental flow regimes. This paper reviews state of the art approaches in characterizing and modeling river and groundwater interactions. Our review covers a wide range of approaches, including remote sensing to characterize the streambed, emerging methods to measure exchange fluxes between rivers and groundwater, and developments in several disciplines relevant to the river‐groundwater interface. We discuss approaches for automated calibration, and real‐time modeling, which improve the simulation and understanding of river‐groundwater interactions. Although the integration of these various approaches and disciplines is advancing, major research gaps remain to be filled to allow more complete and quantitative integration across disciplines. New possibilities for generating realistic distributions of streambed properties, in combination with more data and novel data types, have great potential to improve our understanding and predictive capabilities for river‐groundwater systems, especially in combination with the integrated simulation of the river and groundwater flow as well as calibration methods. Understanding the implications of different data types and resolution, the development of highly instrumented field sites, ongoing model development, and the ultimate integration of models and data are important future research areas. These developments are required to expand our current understanding to do justice to the complexity of natural systems.

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