scholarly journals Modeling Baseflow from an Alluvial Aquifer Using Hydraulic-Conductivity Data Obtained from a Derived Relation with Apparent Electrical Resistivity

1997 ◽  
Vol 5 (3) ◽  
pp. 97-108 ◽  
Author(s):  
A. Dassargues
Keyword(s):  
Electrical Resistivity ◽  
Hydraulic Conductivity ◽  
Alluvial Aquifer ◽  
Conductivity Data

Thermal and Electrical Conductivities of Sodium from 40 to 360 K

1972 ◽  
Vol 50 (12) ◽  
pp. 1386-1401 ◽  
Author(s):  
J. G. Cook ◽  
M. P. Van der Meer ◽  
M. J. Laubitz
Keyword(s):  
Thermal Conductivity ◽  
Electrical Resistivity ◽  
Low Temperatures ◽  
Characteristic Temperature ◽  
Published Data ◽  
Inelastic Electron ◽  
Conductivity Data ◽  
Electron Collisions ◽  
Electrical Conductivities ◽  
Flow Apparatus

We present data on the electrical and thermal resistivities and the thermopower of three pure Na specimens from 40 to 360 K. The measurements were made using a guarded longitudinal heat flow apparatus that had previously been calibrated with Au and Al. The specimens were placed in a vacuum environment using no solid inert liner.The electrical resistivity data indicate ΘR = 194 K. The thermal conductivity data show a 4% minimum near 70 K and an ice point value of 1.420 W/cm K. The reduced Lorenz function L/L0 agrees with published data at low temperatures but above 300 K levels off at approximately 0.91. On the basis of published data for liquid Na, L/L0 does not change by more than 3% at the melting point.The minimum in the thermal conductivity and a part of the high temperature deviations of L from L0 are tentatively ascribed to inelastic electron–phonon collisions having a characteristic temperature near that of longitudinal phonons. The possibility that electron–electron collisions further depress L at high temperatures is critically examined.

Conceptualizing Groundwater-Surface Water Interactions within the Ogallala Aquifer Region using Electrical Resistivity Imaging

2019 ◽  
Vol 24 (2) ◽  
pp. 185-199
Author(s):  
Weston J. Koehn ◽  
Stacey E. Tucker-Kulesza ◽  
David R. Steward
Keyword(s):  
Electrical Resistivity ◽  
Surface Water ◽  
Large Scale ◽  
Water Movement ◽  
Alluvial Aquifer ◽  
Electrical Resistivity Imaging ◽  
Ogallala Aquifer ◽  
Aquifer Recharge ◽  
Arkansas River ◽  
Resistivity Imaging

Dynamic interactions between rivers and aquifers are controlled by the underlying hydrogeologic environment, as well as the type of hydrologic connection between the riverbed and saturated zone. The Arkansas River supplies groundwater to a heavily exploited region of the Ogallala Aquifer across Western Kansas. Site characterizations of this region using existing well and borehole data reveal large scale geologic features that significantly impact recharge processes, such as the Bear Creek fault. However, the existing hydrogeologic data do not provide the level of detail needed to fully understand the contribution of the losing river system to Arkansas Alluvial aquifer recharge. Knowledge about riverbed hydrogeology is acquirable using electrical resistivity imaging (ERI) surveys. ERI surveys and soil sample analysis were conducted at three sites along the Arkansas River to characterize the hydrogeologic environment within the Arkansas River Alluvial aquifer, which overlies the Ogallala aquifer. Temporal changes in electrical resistivity served as an indicator of the hydrologic response of the alluvial sediments to changes in river discharge as different patterns of water movement from the Arkansas River to Arkansas River Alluvial aquifer were observed. The ERI surveys revealed both fully connected and disconnected regions between the riverbed and groundwater table. The results supplement the existing geologic characterization of this region, and provide a more spatially detailed view of the hydrogeologic environment that has a direct causative effect on groundwater surface water interactions. Understanding the behavior of river-aquifer interactions is vital to the ability to predict the future holds of this important groundwater system.

Comparison of Several Interpolators for Smoothing Hydraulic Conductivity Data in South West Iran

1993 ◽  
Vol 36 (6) ◽  
pp. 1687-1693 ◽  
Author(s):  
E. Hosseini ◽  
J. Gallichand ◽  
J. Caron
Keyword(s):  
Hydraulic Conductivity ◽  
Conductivity Data ◽  
South West
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