Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 27 for “"piezometer"”.
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Design and in situ testing of a piezometer system to measure earthquake -induced pore -pressure changes
… have attempted to determine if existing piezometer fields designed to measure earthquake induced pore pressure changes are operating correctly. The signals generated during one investigation were not similar to those expected from an earthquake. In another investigation, while the …
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Processes Governing Rapid Recharge Events in a Shallow Fractured Rock Aquifer Having Minimal Overburden Cover
… radar (GPR) survey was conducted around a piezometer to determine depth to bedrock. Permeameter tests were performed in the overburden layer. A piezometer which responds rapidly to rainfall was identified and field measurements and observations were used to numerically model the piezometer …
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A Vadose Zone Field Study: Subsurface Tile Drainage, Hydrology, and Variablity
… off site regional groundwater contributions. The piezometer analysis showed the difference in water table behavior between undrained and drained conditions. Cluster analysis showed more variability for the drained than the undrained condition, and the water table fell more rapidly after a rainfall …
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Assessment of Hyporheic Exchange at In-stream Restoration Structures on Savage River, Garrett County, Maryland
… following construction; only one in-stream piezometer was unambiguously hydraulically connected to changes in stream stage. Other hydrometric data revealed possible piezometer installations in low permeability materials, potential hydraulic connections to an adjacent wetland or the …
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Monitoring Hydrology in Created Wetland Systems with Clayey Soils
… array of manually monitored wells and piezometers were installed. The electronic arrays contained a U.S. Army Corps of Engineers (USACOE) standard monitoring well, as well as piezometers and tensiometers at three depths. The manually monitored well + piezometer arrays (3 per location; 9 …
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Novel monitoring system to diagnose rail track foundation problems
… of five liquid vertical settlement probes, one piezometer, a small data acquisition system and laptop, and an Internet communication with remote control capabilities. The probes are designed to be small, easily installed (within railbeds using a one-man auger), easily manufactured, and low cost. …
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Overland flow on disturbed soil
… implemented roughness, were equipped with piezometer sets buried under the surface to measure hydrostatic pressure and a system of flow tracers composed of floating objects, border markings and clocks as spatial and temporal references of the surface process, and video cameras to record the …
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Groundwater-lake interactions, Wood Lake, Benson County, North Dakota
… clay within the till. </p><p> Water levels in piezometers around Wood Lake indicate groundwater flows from the southwest into the west side of the lake and out of the lake along the east shore, toward the northeast. High hydraulic conductivities, as determined from slug/bail tests, indicate the …
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Hydrologic Variations Within Created and Natural Wetlands in Southeastern Virginia
… and hourly hydrologic data collected from piezometer nests located in the constructed and surrounding natural wetlands at both locations in order to understand the influences of different construction practices on the hydrology of these mitigation wetlands.</p>
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From grain to floodplain: evaluating heterogeneity of floodplain hydrostratigraphy using sedimentology, geophysics, and remote sensing
… by point sediment descriptions collected during piezometer installment and remotely sensed products. We map heterogeneous structural features that should control resultant flow and transport; orientation and connectivity of these features would control residence times important in hydrologic …
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Effects of Water Table Depth and Edaphic Characteristics on Plant Diversity in a Southern Mississippi Pitcher Plant Bog
… within pitcher plant bogs across seasons. Eight piezometers were installed at random distances to monitor long-term water table depth and pressure fluctuations along a ~710-meter line transect traversing upland and bog habitats. Vegetation sampling quadrats (n=128) were set up near each …
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Methods for Evaluating Aquifer-System Parameters from a Cumulative Compaction Record
… collected from an extensometer and multi-level piezometer at the Lorenzi site in Las Vegas Valley and when graphed yearly, seasonal, and daily signals are observed. Each temporal signal reflects different characteristics of the aquifer-system, including the distinction between aquifer and …
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Estimation of a water budget for Agnes Marsh, Grand Forks County, North Dakota
… distribution of hydraulic conductivity. Second, piezometer nests were installed to characterize the temporal and spatial variation in the ground-water flow system. Third, an estimate of the wetland water budget was used to determine the wetland hydrologic function and sensitivity to hydrological …
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Analysis of a Multi-Aquifer System in the Southern Coastal Plain of Virginia by Trial and Error Model Calibration to Observed Land Subsidence
… in the regions, along with cyclical piezometer data, reflect the nature of the complex multi-aquifer/aquitard system in the Coastal Plain. Franklin, Virginia and Suffolk, Virginia extensometers were deactivated in 1995 and were reactivated in 2016 along with the addition of a …
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Created Ponds as Indicators of Restored Sierra Nevada Meadow Hydrology
… occurred in selected study ponds. Pond and piezometer decline were highly correlated, with R-squared values generally > 0.9. Spatial and temporal variations in pond elevations indicate possible areas with and without groundwater inflow into meadows. Groundwater storage, inflow, and outflow …
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Climatic and hydrologic processes leading to recent wetland losses in Yellowstone National Park, USA
… of five shallow groundwater monitoring well-and-piezometer nests. To quantify historic wetland area I mapped hydric soils, analyzed aerial photographs, and identified geomorphic indicators of higher water. Vegetation was sampled to characterize wetlands and plant-water relationships, and I also …
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Impact of water wheel hydrokinetic unit spacing on hydraulic conditions in a rectangular canal under mild slope subcritical flow with physical modeling
… control structure. Flow depth was measured at 14 piezometer points along the channel and used to calculate hydraulic parameters including the Froude number, power available per unit, and energy grade line. Data from the two-unit scenarios were compared with scenarios with no hydrokinetic units …
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Evaluation of Groundwater Sodium and Sodium Uptake in Taxodium and its Hybrids on Galveston Island, Texas
… of the study area a three by three grid of piezometers, spaced 25 m apart north by south and 60 m apart east by west, was established and groundwater samples were collected from September 2018 to September 2019. Three Solinst Leveloggers were used in the easternmost piezometers in order to …
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Pollutant swapping in constructed agricultural wetlands
… Shallow groundwater samples extracted from a piezometer network surrounding the study site, illustrated that retained sediments acted as a source of NH4-N and DOC to surface and local groundwaters but mitigated leaching and outward transport of NO3-N to surface and groundwaters. Field and …
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Impact of Phytoremediation System on Groundwater Flow in a Shallow Aquifer System
… include more frequently collected rainfall and piezometer data, as well as the installation of more piezometers outside the model domain contained in this study. Using the Evapotranspiration Package in MODFLOW provided more realistic and authentic results than using the Well Package (used in a …
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