Assessment of shallow subsurface characterisation with non-invasive geophysical methods at the intermediate hill-slope scale

Popp, S.; Altdorff, Daniel; Dietrich, Peter

doi:10.5194/hess-17-1297-2013

Cited by 10 publications

(6 citation statements)

References 35 publications

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“…Besides hydrogeophysical methods such as electromagnetics (EM) (Popp et al, 2013;Robinson et al, 2012;Trompvan Meerveld and McDonnell, 2009), time-lapse ERT have been frequently applied to hillslope investigation in the runoff and interflow (Uhlenbrook et al, 2008;Cassiani et al, 2009) or preferential flow context (Leslie and Heinse, 2013).…”

Section: R Hübner Et Al: Monitoring Hillslope Moisture Dynamics Witmentioning

confidence: 99%

Monitoring hillslope moisture dynamics with surface ERT for enhancing spatial significance of hydrometric point measurements

Hübner¹,

Heller²,

Günther

et al. 2015

Hydrol. Earth Syst. Sci.

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Abstract. Besides floodplains, hillslopes are basic units that mainly control water movement and flow pathways within catchments of subdued mountain ranges. The structure of their shallow subsurface affects water balance, e.g. infiltration, retention, and runoff. Nevertheless, there is still a gap in the knowledge of the hydrological dynamics on hillslopes, notably due to the lack of generalization and transferability. This study presents a robust multi-method framework of electrical resistivity tomography (ERT) in addition to hydrometric point measurements, transferring hydrometric data into higher spatial scales to obtain additional patterns of distribution and dynamics of soil moisture on a hillslope. A geoelectrical monitoring in a small catchment in the eastern Ore Mountains was carried out at weekly intervals from May to December 2008 to image seasonal moisture dynamics on the hillslope scale. To link water content and electrical resistivity, the parameters of Archie's law were determined using different core samples. To optimize inversion parameters and methods, the derived spatial and temporal water content distribution was compared to tensiometer data. The results from ERT measurements show a strong correlation with the hydrometric data. The response is congruent to the soil tension data. Water content calculated from the ERT profile shows similar variations as that of water content from soil moisture sensors. Consequently, soil moisture dynamics on the hillslope scale may be determined not only by expensive invasive punctual hydrometric measurements, but also by minimally invasive time-lapse ERT, provided that pedo-/petrophysical relationships are known. Since ERT integrates larger spatial scales, a combination with hydrometric point measurements improves the understanding of the ongoing hydrological processes and better suits identification of heterogeneities.

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Section: R Hübner Et Al: Monitoring Hillslope Moisture Dynamics Witmentioning

confidence: 99%

Monitoring hillslope moisture dynamics with surface ERT for enhancing spatial significance of hydrometric point measurements

Hübner¹,

Heller²,

Günther

et al. 2015

Hydrol. Earth Syst. Sci.

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“…However, a specii c limitation arises also from high sensitivity of the acquisition system to environmental conditions and limited calibration accuracy, which is both regarded as system specii c. However, we expect that also other EMI systems or even some soils may exhibit a more or less prominent and rapid reaction on changing environmental conditions during surveys lasting several days. Hence, for future work over heterogeneous ground, we see more potential in assessing soil moisture on the basis of multi-physical information, that is, by combining dif erent physical parameter variation maps in an automated fashion with sparse target parameters avoiding the explicit deterministic formulation of specii c inter-parameter relationships, for example, as used by Paasche and Eberle (2010) or Popp et al (2013).…”

Section: Determinisi C Transfer Funci Onmentioning

confidence: 99%

Soil Moisture Assessment over an Alpine Hillslope with Significant Soil Heterogeneity

Sauer

Popp

Dittfurth

et al. 2013

Vadose Zone Journal

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We strive to assess soil water content on a well‐studied slow‐moving hillslope in Austria. In doing so, we employ time lapse mapping of bulk electrical conductivity using a geophysical electromagnetic induction system operated at low induction numbers. This information is complemented by the acquisition of soil samples for gravimetric water content analysis during one survey campaign. Simple visual soil sample analysis reveals that the upper material in the survey area is a spatially highly variable mixture of predominately sandy, silty, clayey and organic materials. Due to this heterogeneity, classical approaches of mapping soil moisture on the basis of stationary mapping of electrical conductivity variations are not successful. Also the time‐lapse approach does not allow ruling out some of the ambiguity inherent to the linkage of bulk electrical conductivity to soil water content. However, indication is found that time‐lapse measurements may have supportive capabilities to identify regions of low precipitation infiltration due to high soil saturation. Furthermore, the relationship between the mean electrical conductivity averaged over a full vegetation period and an already available ecological moisture map produced by vegetation analysis is found to resemble closely the relationship observed between gravimetric soil water content and electrical conductivity during the time of sample collection except for highly organic soils. This leads us to the assumption that the relative soil moisture distribution is temporarily stable except for those areas characterized by highly organic soils.

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“…Geophysical methods which are usually noninvasive have proven to be very vital tools for analysing and characterising the subsurface conditions for groundwater and engineering applications due to their large sampling rate (Giao et al 2003;Papadopoulos et al 2006;Soupios et al 2007;Anderson et al 2008;Popp et al 2013). Moreso, the geophysical methods have been reported to enhance the reliability, speed, and reduction in cost of geotechnical investigations (Anderson et al 2008;Arjwech and Everett 2015).…”

Section: Introductionmentioning

confidence: 99%

Electrical resistivity imaging and multichannel analysis of surface waves for mapping the subsurface of a Wetland Area of Lagos, Nigeria

Uwaezuoke

Ishola

Ayolabi

2021

NRIAG Journal of Astronomy and Geophysics

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Electrical resistivity imaging (ERI) and Multichannel Analysis of Surface Waves (MASW) surveys were carried out over a reclaimed wetland area of University of Lagos, Nigeria. The main purpose of the geophysical surveys was to characterise the site for better understanding of the subsurface conditions before building construction is carried out. For this purpose, seven traverses were established for electrical resistivity and surface waves measurements. The PASI resistivity metre was used for the ERI surveys with minimum electrode spacing of 5 m using the Wenner array. The MASW measurements were carried out using Terraloc seismograph with 24 channel 4.5 Hz vertical component geophones. The results of the ERI surveys show that the subsurface strata are composed of peat/organic materials with resistivity values of (0.7-3) Ω-m, silty clay having resistivity values of (5-50) Ω-m and sandy clay sediments of resistivity between (51-105) Ω-m, all were mapped at different depths. Also, the shear wave velocity models from MASW measurements show that three zones were clearly mapped. These zones are the low shear strength strata of peat/organic materials with Vs between (25-70) m/s, silty clay with Vs ranges between (70-120) m/s and sandy clay of Vs ranging from (120-150) m/s. The combined approach has helped to better define the interface between layers, their thicknesses and consistency of each stratum. Thus, moderate to very strong correlations between the measured resistivity and velocity and the boreholes drilled were achieved. The regression models obtained compared reasonably well for all the traverses. The engineering implication of the geological units mapped is that the site is characterised with weak/incompetent materials not suitable for hosting the foundation of especially massive engineering structures. Hence, deep foundation through pilling to the competent layer is to be giving consideration or soils improvement techniques can be employed for the stabilisation of the soils.

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Assessment of shallow subsurface characterisation with non-invasive geophysical methods at the intermediate hill-slope scale

Cited by 10 publications

References 35 publications

Monitoring hillslope moisture dynamics with surface ERT for enhancing spatial significance of hydrometric point measurements

Monitoring hillslope moisture dynamics with surface ERT for enhancing spatial significance of hydrometric point measurements

Soil Moisture Assessment over an Alpine Hillslope with Significant Soil Heterogeneity

Electrical resistivity imaging and multichannel analysis of surface waves for mapping the subsurface of a Wetland Area of Lagos, Nigeria

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