Electrical resistivity imaging surveys are used to monitor variations in pore fluid chemistry and saturation as well time‐lapse changes. Temperature the near surface can produce larger magnitude changes electrical conductivity than due slow moving solute plumes or spatial soil moisture. Relationships between temperature based on previous studies conducted over 25–200°C do not explain 0–25°C laboratory data. A modification dependence within a petrophysical model is proposed that may allow...

Abstract Groundwater flow through coarse blocky landforms contributes to streamflow in mountain watersheds, yet its role the alpine hydrologic cycle has received relatively little attention. This study examines internal structure and hydrogeological characteristics of an inactive rock glacier Canadian Rockies using geophysical imaging techniques, analysis discharge hydrograph spring draining glacier, chemical stable isotopic compositions source waters. The results show that sediments forming...

Geometrically complex heterogeneities at a decommissioned sour gas plant could not be adequately characterized with drilling and 2D electrical resistivity surveys alone. In addition, imaging profiles produced misleading images as result of out‐of‐plane anomalies violation the assumption. Accurate amplitude positioning conductivity associated subsurface geochemical distribution were required to effectively analyze remediation alternatives. Forward inverse modeling field examples demonstrated...

Abstract Understanding groundwater processes in alpine watersheds is critical to understand the timing of water release and late‐season stream flow for both headwater downstream environments. Moraines talus features can play an important role storage watersheds, but neither process well understood these features. We examined complex hydrogeological environment a partially ice‐cored moraine Lake O'Hara watershed Canadian Rockies. Electrical resistivity imaging (ERI) seismic refraction...

Abstract Despite our current understanding of permafrost thaw in subarctic regions response to rising air temperatures, little is known about the subsurface geometry and distribution discontinuous bodies peat‐covered, wetland‐dominated terrains their responses temperature. Using electrical resistivity tomography, ground‐penetrating radar profiling, thermal‐conduction modeling, we show how land cover distributions influence thawing at a study site Northwest Territories, Canada. Permafrost...

In the northern prairie region of North America, numerous seasonal wetlands and ephemeral ponds form as snowmelt water is trapped in small topographical depressions. A detailed hydrogeological investigation combined with electrical resistivity imaging (ERI) to evaluate roles on depression‐focused groundwater recharge at St. Denis National Wildlife Area Saskatchewan, Canada. The analysis samples indicated two distinct geochemical zones: a zone salt leaching under Wetland 109 zones...

Abstract. The different types of geological deposits and rock formations found in alpine watersheds play key roles regulating the rate timing runoff to mountain rivers. Talus meadows are dominant features these areas, but scant data exist for their capacity store transmit groundwater. To gain further understanding processes, we have undertaken a combined geophysical hydrological study small (2100 m2) meadow surrounding talus within Lake O'Hara watershed Canadian Rockies. Several intersecting...

Special hydrogeophysics issues published by hydrology and geophysics journals, special sessions workshops at conferences, an increasing number of short courses demonstrate the growing interest in use for hydrologic investigations. The formation technical subcommittee AGU's Hydrology section adds further evidence recognized significance this interdisciplinary field. Given clear value nondestructive nonintrusive imaging subsurface investigations, we believe advances adoption existing...

Three-D electrical resistivity imaging (ERI) using sets of orthogonal 2-D survey lines provides an efficient and cost effective tool for site characterization in environmental engineering investigations. A 3-D design sparse reduces the time at expense resolution. The effects line spacing on resolution images were investigated numerical modeling with synthetic field data two standard configurations, dipole-dipole Wenner arrays. Synthetic studies indicate that configuration produces a more...

In order to develop and test a methodology for incorporating time‐lapse electrical resistivity imaging (ERI) into the monitoring of salt‐affected soil groundwater, multifaceted study including imaging, push tool conductivity (PTC), core analysis was conducted monitor movement saline contaminant plume over span 3 years. The survey done on field site containing soils groundwater depths 7 m. contained tile drain system at approximately 2 m below ground level. Temperature saturation changes were...

Variations in temperature during time-lapse electrical resistivity imaging (ERI) surveys introduce changes conductivity (EC). When the goal of ERI survey is to image EC due saturation or pore water salinity, compensation must be made for effect variations. A temperature-compensation method can approximate data with variations removed. First uncompensated are inverted. The inversion model then adjusted a standard image. Forward simulations performed using and equivalent model....

Abstract Groundwater storage in alpine regions is essential for maintaining baseflows mountain streams. Recent studies have shown that common landforms (e.g., talus and moraine) substantial groundwater capacity, but the hydrogeological connectivity between individual has not been understood. This study characterizes hydrogeology of an cirque basin Canadian Rocky Mountains contains typical (talus, meadow, moraines) hydrological features (tarn, streams, springs). Geological, hydrological,...

Abstract Unconsolidated sediments in alpine watersheds can store glacier melt and snowmelt as groundwater, which helps sustain flow mountain rivers during dry periods. However, the amount distribution of groundwater storage rugged terrain is not well understood, hindering our ability to predict rate timing discharge into streams. We show how non‐invasive time‐lapse microgravity surveys be used gauge spatial changes within a large ( ca 1500 × 1000 m) moraine–talus field Lake O'Hara watershed...

Electrical resistivity imaging (ERI), ground penetrating radar (GPR) and seismic refraction (SRF) profiles were repeated over three lines on a terrace of the Bow River. The site had resistive gravel layer overlying mudstone bedrock with horizontal transitions to lacustrine overbank deposits. results best for determining changes in sediment types detecting boundaries, but ERI smoothness constraint blurred location boundaries. GPR gave most resolution showed internal structures that other...

A model to predict the hydraulic conductivity of consolidated clay, simulating clay liners compacted wet optimum, is presented. The concept that clays exist as clusters and electrical double layer theory are used for permeants known composition. relates physical properties clays, such its surface area, with overburden pressure concentration ions in permeant. can be bentonitic monovalent well divalent exchangeable cations. valid within range applicability Gouy-Chapman electric theory....

Electrical resistivity imaging (ERI) was used to further characterize the geologic setting at proposed Aurum solid-waste landfill site near Edmonton, Alberta. Two bedrock channel aquifers, east and south channels, exist in or site. Previous studies borehole pumping test data determine that two aquifers are separate hydraulically disconnected by a sheet of ice thrust bedrock. The three objectives ERI were resolve sand channels terrace sands, top bedrock, beneath survey, combination with data,...

Monoethanolamines (MEA) are commonly used by the natural gas industry to remove acid gases from stream. A series of pan studies was conducted examine biodegradability MEA in soil recovered a plant site under various environmental conditions. Experimental results indicate that successfully biodegraded or transformed into other compounds both aerobic and anaerobic conditions even at concentrations greater than 1500 mg/kg. Ammonium, acetate, nitrogen were dominant by-products these experiments....

Leaching of salts in the presence elevated soil sodicity can result reduced hydraulic conductivity due to clay swelling or dispersion. This study examines dynamics and mechanisms decrease induced during salt leaching a structured, smectite‐bearing subsoil. Intact cores were initially equilibrated with aqueous solutions salinity sodicity. Results solution fixed demonstrated that, this structured soil, levels successfully leached before reaching stable conductivity. disequilibrium between...