Comparison of alternative representations of hydraulic-conductivity anisotropy in folded fractured-sedimentary rock: modeling groundwater flow in the Shenandoah Valley (USA)

Yager, Richard M.; Voss, Clifford I.; Southworth, Scott

doi:10.1007/s10040-008-0431-x

Cited by 19 publications

(15 citation statements)

References 13 publications

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“…SUTRA has been successfully employed to investigate fluid pressure response for many complex geologic environments, including highly fractured and folded units (e.g. Fulton et al ., ; Yager et al ., ; Yager and Ratcliffe, ; Popek and Saffer, ).…”

Section: Equation Of Subsurface Flow and Methods Of Solutionmentioning

confidence: 99%

Fluid pressure responses for a Devil's Slide‐like system: problem formulation and simulation

Thomas

Loague

Voss

2014

Hydrological Processes

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Abstract:This study employs a hydrogeologic simulation approach to investigate subsurface fluid pressures for a landslide-prone section of the central California, USA, coast known as Devil's Slide. Understanding the relative changes in subsurface fluid pressures is important for systems, such as Devil's Slide, where slope creep can be interrupted by episodic slip events. Surface mapping, exploratory core, tunnel excavation records, and dip meter data were leveraged to conceptualize the parameter space for three-dimensional (3D) Devil's Slide-like simulations. Field observations (i.e. seepage meter, water retention, and infiltration experiments; well records; and piezometric data) and groundwater flow simulation (i.e. one-dimensional vertical, transient, and variably saturated) were used to design the boundary conditions for 3D Devil's Slide-like problems. Twenty-four simulations of steady-state saturated subsurface flow were conducted in a concept-development mode. Recharge, heterogeneity, and anisotropy are shown to increase fluid pressures for failure-prone locations by up to 18.1, 4.5, and 1.8% respectively. Previous estimates of slope stability, driven by simple water balances, are significantly improved upon with the fluid pressures reported here. The results, for a Devil's Slide-like system, provide a foundation for future investigations.

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Section: Equation Of Subsurface Flow and Methods Of Solutionmentioning

confidence: 99%

Fluid pressure responses for a Devil's Slide‐like system: problem formulation and simulation

Thomas

Loague

Voss

2014

Hydrological Processes

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“…The carbonate formations within our AOI (see Section 6) generally present a welldeveloped orthogonal joint system, which, combined with bedding-plane faulting and tectonic deformation, create the potential for secondary porosity and preferential groundwater flow (Yager, Voss, and Southworth 2009). The majority of the karst features encountered within the Valley and Ridge physiographic province of Virginia, where our AOI resides, are of the solution sinkhole variety.…”

Section: Morphologymentioning

confidence: 99%

Detection of geophysical features in InSAR point cloud data sets using spatiotemporal models

Vaccari

Stuecheli

Bruckno

et al. 2013

International Journal of Remote Sensing

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In this article, we introduce an approach for detecting evolving geophysical features within interferometric synthetic aperture radar (InSAR)-derived point cloud data sets. This approach is based on the availability of models describing both spatial and temporal behaviours of the geophysical features of interest. The model parameters are used to generate a multidimensional space that is then scanned with a user-defined resolution. For each point in the parameter space, a spatiotemporal template is reconstructed from the original model. This template is then used to scan the point cloud data set for regions matching the spatiotemporal behaviour.We also introduce a proportional measure where the residual for each point in the data set is compared to both the data and the template to provide a scale invariant measure of the behavioural matching. The matching is evaluated for every point in the parameter over a region of influence determined by the parameters. The resulting multidimensional space is then collapsed onto geographical coordinates to produce an overlay map identifying regions whose spatiotemporal behaviour matches the feature of interest.We tailored our approach to the detection of subsidence behaviour, indicative of the development of sinkholes, modelled as Gaussian with amplitude linearly increasing with time. We verified the validity of our model using both synthetic and actual InSAR data sets. The latter was obtained by processing imagery of a region near Wink, Texas, containing ground truth sinkhole data.We applied this framework to a 40 km × 40 km area of interest located in western Virginia and performed ground validation on a subset of the identified regions. The results show good agreement between the locations detected by our algorithm and the evidence of subsidence observed during the ground validation campaign.

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“…Groundwater flow may not be perpendicular to lines of equipotential, particularly in karstic areas where conduit systems may act. The directions of maximum and medium K conform to the strike and dip of bedding, respectively, while the minimum K direction is perpendicular to bedding 3 . To estimate aquifer hydraulic parameters, different pumping test methods are used; however, long-duration, step pumping, and recovery tests can be used.…”

Section: Introductionmentioning

confidence: 99%

Quantitative hydro-geophysical analysis of a complex structural karst aquifer in Eastern Saudi Arabia

Alfy

Lashin

Faraj

et al. 2019

Sci Rep

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The Umm er Radhuma (UER) Formation is a major karst aquifer in Saudi Arabia. This study investigated the hydraulic and petrophysical characteristics of the folded UER carbonate aquifer using integrated hydrological and geophysical logging datasets to understand its complex hydraulic setting as well as detect possible water flow. Petrophysical analysis showed that the UER aquifer has three zones with different lithologic and hydraulic properties. The upper zone attains the best properties with average values of 20%, >100 mD, 3.30 × 10 −5 –1.34 × 10 −3 m/s, and 1.49 × 10 −3 –6.04 × 10 −2 m 2 /s, with respect to effective porosity, permeability, hydraulic conductivity and transmissivity. The gamma-ray logs indicate a good fracture system near the upper zone of the UER Formation. Pumping test measurements of transmissivity, hydraulic conductivity and storage coefficients were matched with those from geophysical logs and found to be within the expected range for confined and leaky aquifers. Hydrogeological properties were mapped to detect possible groundwater flow in relation to the dominant structure. The underground water of the folded UER aquifer was forced along meandering flow patterns from W-E to SW-NE through the anticlinal axes. The integrated approach can be further used to enhance local aquifer models and improve strategies for identifying the most productive zones in similar aquifer systems.

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Comparison of alternative representations of hydraulic-conductivity anisotropy in folded fractured-sedimentary rock: modeling groundwater flow in the Shenandoah Valley (USA)

Cited by 19 publications

References 13 publications

Fluid pressure responses for a Devil's Slide‐like system: problem formulation and simulation

Fluid pressure responses for a Devil's Slide‐like system: problem formulation and simulation

Detection of geophysical features in InSAR point cloud data sets using spatiotemporal models

Quantitative hydro-geophysical analysis of a complex structural karst aquifer in Eastern Saudi Arabia

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