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 30 for “"Land Subsidence"”.
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GPS Monitoring and Land Subsidence in the Houston Metropolitan Area
… Houston metropolitan area and conducting precise subsidence and faulting monitoring over time and space, (2) evaluate the effects of groundwater withdrawal on land subsidence, and (3) assess the possible effect of petroleum production on ongoing minor subsidence within Galveston County. In order …
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Current Land Subsidence And Fault Movement In The Long Point Fault Area
Land subsidence driven by groundwater withdrawal has affected the greater Houston region for over a century, posing ongoing risks to infrastructure and urban development. This study investigates fault activity along the Long Point Fault (LPF) and characterizes surrounding land subsidence using a …
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Modelling land subsidence due to groundwater pumping/recharging in the Las Vegas valley
A model for ground settlement and swelling occurring in Las Vegas Spring Preserve due to groundwater level changes has been developed. A FORTRAN code that uses the finite element method has been prepared. The computer code calculates the hydraulic head in the aquifer resulting from pumping and …
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Spatio-temporal modeling of Louisiana land subsidence using high resolution geo-spatial data
Problems caused by subsidence are very common in many areas of the world, and this kind of problems may be serious and threatening to living people in Louisiana. Adverse subsidence in Louisiana will cause serious problems, such as excessive wetland formation or land loss, if we can’t make …
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Groundwater Pumping Decisions and Land Subsidence in the Southern Chesapeake Bay Region of Virginia
Land subsidence is the gradual settling or sudden sinking of the earth's surface. According to the United States Geological Survey more than 80% of identified subsidence in the United States is a result of groundwater removal. Due to the hydrologic structure and reliance on the Potomac Aquifer, the …
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Characterization and modeling of land subsidence due to groundwater withdrawals from the confined aquifers of the Virginia Coastal Plain
… water levels in environments experiencing land subsidence. In the southeastern Coastal Plain of Virginia, high-sensitivity borehole pipe extensometers were used to measure 24.2 mm of total compaction at Franklin from 1979 to 1995 (an average of 1.5 mm/yr) and 50.2 mm of total compaction at …
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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
… result of the combination of sea-level rise and land subsidence associated with aquifer compaction from excessive groundwater pumping. Detailed time-series of cumulative compaction data (land subsidence) from the three U.S. Geological Survey deployed extensometers in the regions, along with …
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Current Ground Motions in Montgomery, West Liberty, and Northern Harris Counties Derived from Continuous GPS Motions
… Houston area has been adversely affected by land subsidence possibly more than any other area in the United States. Houston and its surrounding areas have been suffering frequent infrastructure damage associated with faulting and land subsidence for almost a century. Currently, land …
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Land Rebound and Preconsolidation Head in the Houston Ship Channel Area
Widespread land subsidence resulting from excessive groundwater pumping has occurred in and around Houston, Texas for nearly a century. Hydraulic heads in much of the region have been recovering steadily since the mid-1970s following the efforts of local organizations to regulate groundwater …
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Earth Observation Data-Driven Assessment of Local to Regional, Contemporary, and Emerging Coastal Environmental Security Challenges
… as sea level rise, storm surges, hurricanes, land subsidence, and population growth. The coastal U.S. is highly vulnerable to many of these climate and human-induced stressors. Over the past three decades, sea levels have risen by about 0.1 m along the U.S. coasts, with an additional projected …
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Quantifying high-resolution hydrologic parameters at the basin scale using InSAR and inverse modeling, Las Vegas Valley, NV
… Vegas basin, and to investigate future trends of land subsidence in Las Vegas Valley. This dissertation consists of three separate stand-alone chapters. Chapter 2 presents a discrete adjoint parameter estimation (APE) algorithm for automatically identifying suitable hydraulic parameter zonations …
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Natural Hazards Monitoring Using Multiple Remote Sensing Techniques and Machine Learning Algorithms
… rapid onset hazards (disasters), and the subsidence in Tianjin, China is used to exemplify the methods of monitoring slow onset natural hazards. In February 2021, an unprecedented winter storm dumped the snow record in Texas. It claimed hundreds of lives and evolved into a major disaster …
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Geodetic and Geodynamic Constraints on Vertical Land Motions in the Chesapeake Bay
… on the East Coast of the United States. Regional land subsidence enhances sea-level rise, however quantified rates of vertical land motions vary substantially in published solutions and the precise drivers are not well understood. From 2019 to 2023, a collaborative effort led by the USGS was …
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Novel Multitemporal Synthetic Aperture Radar Interferometry Algorithms and Models Applied on Managed Aquifer Recharge and Fault Creep
… 2022 demonstrates MAR's effectiveness in curbing land subsidence within Orange County, CA. Additionally, MAR has the potential to stabilize nearby faults by inducing a negative Coulomb stress change. Projecting into the future, a suggested 2% annual increase in recharge volume through 2050 could …
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Achieving integrated resilience to Coastal Flooding on the Military Installations and Surrounding Communities on the U.S. East Coast
… coastline, high relative sea level rise (SLR), land subsidence, and high urban densities. In addition to residential and commercial assets, many populated places also have aging critical infrastructure such as airports, fire stations, schools, roads, bridges, and levees that exacerbate flood …
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Effects of delayed drainage on subsidence modeling and parameter estimation
The use of delayed drainage in land subsidence modeling greatly complicates model calibration, particularly when the thickness of the fine-grained interbeds varies throughout the modeled region. This thesis documents two separate projects (chapters) related to the use of delayed drainage in …
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Hydrogeologic analysis of streamflow in relation to underground mining in northern West Virginia
Land subsidence, caused by longwall mining, has a negative effect on overlying watersheds. Nine streams were monitored from their headwaters to their mouths for discharge, temperature, conductivity, alluvium thickness, and alluvium sediment size. Seven streams are located over undermined longwall …
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City of Watsonville Local Hazard Mitigation Plan
… flooding, hazardous materials, liquefaction, land subsidence, landslides, unreinforced masonry, airport hazards, civil disturbance/terrorism, dam failure, drought, expansive soils, natural gas pipeline failure, vehicle collisions, tornados, and tsunamis.</p>
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Fluid and Pressure Dynamics in Natural and Engineered Coastal Aquifer Systems
… groundwater depletion, seawater intrusion, and land subsidence driven by long-term pumping. This dissertation uses 3D numerical modeling to evaluate how variable-density flow and geological heterogeneity influence pressure response, intrusion geometry, and deformation in stressed coastal …
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Methods for Evaluating Aquifer-System Parameters from a Cumulative Compaction Record
… to reduce over-pumping of aquifer-systems, land subsidence is still a serious issue worldwide. Accurate aquifer characterization is critical to understand the response of an aquifer-system to prolonged pumping but is often difficult and expensive to conduct. The purpose of this thesis is to …
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