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Showing 1 to 19 of 19 for “"Slug Tests"”.
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Analysis of Slug Tests to Determine Hydraulic Conductivity of Vertical Cutoff Walls
The primary contribution made in this research is to develop two new methods to evaluate hydraulic conductivity in a cutoff wall considering the compressibility of the backfill material and the proximity of the wall boundaries to the well. One of the new methods involves a series of type curves …
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Borehole Measurements of Dynamic Basal Drainage Adjustments During Sliding Accelerations: Bench Glacier, Alaska
… perturbations of borehole water levels, or slug tests, are a commonly employed means of characterizing the glacier hydrologic system. Results documenting the influence of slug testing on a field of boreholes and its change with time, however, are scarce. Slug tests were performed on Bench …
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Borehole Measurements of Dynamic Basal Drainage Adjustments During Sliding Accelerations: Bench Glacier, Alaska
… perturbations of borehole water levels, or slug tests, are a commonly employed means of characterizing the glacier hydrologic system. Results documenting the influence of slug testing on a field of boreholes and its change with time, however, are scarce. Slug tests were performed on Bench …
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Some contributions to the hydraulic characterization of fractured bedrock formations
… biases and the ability to perform hydraulic tests at isolated borehole intervals. The two field hydraulic tests were named the large drawdown slug test, and the gas injection test. Large drawdown slug tests are defined as those slug tests with initial drawdown larger than 5 m; these were …
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From grain to floodplain: evaluating heterogeneity of floodplain hydrostratigraphy using sedimentology, geophysics, and remote sensing
… hydraulic conductivity estimates from slug tests, ground-penetrating radar (GPR), historical maps of former channels, LiDAR-based elevation and Normalized Difference Vegetation Index data to infer 3-D fluvial stratigraphy. We compare and contrast stratigraphy of two meanders with …
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Estimating Transmissivity From the Water Level Fluctuations of a Sinusoidally Forced Well
… than the values determined by field methods (slug tests, pump tests, and a packer test). These differences in T may be explained by differences in the radius of investigation of each test and the geologic heterogeneity. Testing these new methods with additional field data is suggested. …
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Hydrologic investigation of three constructed mitigation wetlands and one natural wetland in West Virginia
… from Shelby tubes, and from in-situ slug tests. These data were used to compare hydrologic conditions at the constructed mitigation wetlands to the natural reference wetland. In addition, a detailed numerical groundwater model was developed for one of the mitigation sites.;Persistent …
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Hydrogeology and groundwater geochemistry of two glacigenic aquitard/aquifer systems in north-central and south-central Minnesota
… anions, nutrients, enriched 3H, δ18O, and δ2H. Slug tests were performed to estimate Kh in the till and aquifer tests were performed to estimate the bulk Kv of the aquitards.</p> <p>Hydraulic data at both sites suggest that groundwater flow is vertically downward. Geometric mean Kh values from …
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Soil-Bentonite Cutoff Walls: Hydraulic Conductivity and Contaminant Transport
… currently used test methods were evaluated: API tests on grab samples, lab tests on undisturbed samples, piezometer tests (slug tests), and piezocone soundings. The use of slug tests in cutoff walls was improved in this research in the areas of avoiding hydraulic fracture and accounting for the …
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MONITORING INFILTRATION FROM NATURAL STORMS USING TIME-LAPSE ELECTRICAL RESISTIVITY TOMOGRAPHY
… moisture data during these events. Additionally, slug tests and infiltrometer tests were collected along the transect to characterize the subsurface at the study site. TL-ERT successfully located sections with preferential flow, and these results were reproducible three months later. Other methods …
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Hydrologic behaviour and hydraulic properties of a patterned fen in Saskatchewan
… through use of a surface loading test, pumping tests, and an enclosed field drainage test. None of these field tests have been previously described in the literature as having been used in peat environments. The combined results of field and laboratory drainage tests were used to obtain a …
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Groundwater and Tidal Controls on Wetland Hydrology, Julie J. Metz Wetland Mitigation Bank, Woodbridge, Virginia
… conductivity (K<sub>sat</sub>) by performing slug tests, and calibrate wetland water budget models using Wetbud software. Wetbud-generated water budgets using both Basic and Advanced scenarios calculated estimated water levels at Pod 3 for a typical Dry, Normal, and Wet year, and custom …
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Characterization of Pre and Post Re-Naturalized Surface Water/Groundwater Exchange, Jocko River, Flathead Indian Reservation, Montana
… position. Grain size analyses, falling head slug tests, seepage runs, mini-piezometers and streambed temperature profiles were used to define the direction and magnitudes of channel-groundwater exchange. Study results show the upper 6400 ft of the river in the study area is primarily a losing …
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Characterization of Pre and Post Re-Naturalized Surface Water/Groundwater Exchange, Jocko River, Flathead Indian Reservation, Montana
… position. Grain size analyses, falling head slug tests, seepage runs, mini-piezometers and streambed temperature profiles were used to define the direction and magnitudes of channel-groundwater exchange. Study results show the upper 6400 ft of the river in the study area is primarily a losing …
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Using Ground Penetrating Radar Signal Reflection to Model a Highly Transmissive Bedrock Aquifer
… ground penetrating radar (GPR) signal.</p> <p>Slug tests were performed in ten bedrock wells, located within and surrounding a highly conductive zone. The transmissivities measured in these wells ranged from 1.5 E-1 ft<sup>2</sup>/day to 4.2 E+2 ft<sup>2</sup>/day; values greater than 100 …
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The influence of the Critical Zone on hillslope hydrology and stability
… by seismic refraction data, hundreds of field slug tests, and predicted topographic stress fields. The value of combining geophysical constraints with hydromechanical modeling for a more realistic characterization of CZ behavior was demonstrated by the notable improvement in reproducing …
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Temporal Dynamics of Groundwater Flow Direction in a Glaciated, Headwater Catchment
… sediments of the C horizon. I conducted 47 slug tests across the well network to determine hydraulic properties of the aquifer materials surrounding each well. In addition, our team conducted a large-scale auger investigation mapping soil horizon depths and thicknesses. Results show that the …
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Accurate Cylindrical-Coordinate Numerical Models For The Analysis Of Hydrologic Tests
… modeling codes for the simulation of hydrologic tests. One of these numerical modeling codes, the Slug Test Simulator (STS), was designed for the mechanics of a single well test, or slug test. STS can handle a variety of conditions including unconfined flow, partial penetration, layered …