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 43 for “"sinkhole"”.
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Sinkhole Form as an Indicator of Process in Karst Landscape Evolution
… of the morphology of the basic karst unit, the sinkhole; and then using a random, stratified sampling design, postulates and evaluates the importance of non-solutional processes in the development of sinkholes in two contrasting karst subtypes (normal and exhuming fluviokarst) of the Mitchell …
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Assessing landscape and seasonal controls on CO2 fluxes in a karst sinkhole
… on quantifying CO2 diffusion within a karst sinkhole. The objectives of this study were to: 1) identify the depth of the zero-flux plane (i.e., depths of local maximum CO2 concentrations), analyze the distributions of concentration gradients, and investigate the validity of a uniform …
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A new sinkhole attack detection algorithm for RPL in wireless sensor networks (WSN)
… critical tasks and become targets of attacks. Sinkhole attack is one of the most common attacks to sensor networks, threatening the network availability by dropping data or disturbing routing paths. RPL is a standard routing protocol commonly used in sensor networks. Therefore, this research …
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Location Of Sinkhole Confining Breach Using Groundwater Flow Patterns Derived From Cone Penetration Testing
… many years. The enlarged cavity is also known as sinkhole. The investigations of sinkhole characteristics and potential involve studying the regional geology, hydrology and mapping historic sinkholes that have occurred in the area. Use of Cone Penetration Test (CPT) soundings, in conjunction with …
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Automated sinkhole extraction and morphological analysis in northeast Iowa using high-resolution LiDAR data
1 PDF file (viii, 93 pages)
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Predictive Modeling Of Sinkhole Hazards Using Synthetic Aperture Radar Interferometry (Insar) Subsidence Measurements And Local Geology
… to understand the growth of the Bayou Corne sinkhole and the conditions surrounding the Napoleonville Salt Dome that may have exacerbated its formation. The Bayou Corne sinkhole in Assumption Parish, Louisiana has been expanding since it formed overnight on 2 August 2012. Growing from …
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Sinkholes in the marble and dolostone karst of Sylacauga, Alabama
The hypothesis of this study is that sinkhole occurrence is being anthropogenically accelerated or induced in the study area. The objectives of this research are: - to identify natural conditions in the study area which are associated in the literature with sinkhole development - to identify the …
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Analysis of Sinkhole Susceptibility and Karst Distribution in the Northern Shenandoah Valley, Virginia: Implications for Low Impact Development (LID) Site Suitability Models
… rock. This study uses a 1:24,000 scale sinkhole map derived from sinkhole boundaries identified by geologist David Hubbard (1984) of the Virginia Department of Mines and Minerals (DMME) to develop a more detailed karst map for a sub-watershed of the NSV region. The analysis uses …
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LIDAR-BASED DELINEATION OF KARST FEATURES IN THE GYPSUM PLAIN, EDDY COUNTY, NEW MEXICO AND CULBERSON COUNTY, TEXAS
… Karst features that manifest surficially as sinkholes when breached range from extensive hypogene cave systems to epigene features and suffosion caves. In contrast, paleo-collapse structures forming breccia pipes attesting to more ancient karst within these strata often manifest as …
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The geochemistry of water-filled sinkholes at Bitter Lake National Wildlife Refuge, Roswell, NM : implications for hydrochemical evolution and trophic support
… a hydrochemical baseline survey of water-filled sinkholes at Bitter Lake Nation Wildlife Refuge (Roswell, NM). Water samples from 10 representative sinkholes taken at 1.0m increments were analyzed for major ions, stable isotopes [δ18O, δD], and dissolved gases. Sinkholes are surface features at a …
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Analytical and numerical study of dolomite sinkholes in Centurion South Africa
Sinkholes encompass the withdrawal of shallow sediment into deep hollow compartments located in karstic stratum. These subsequent surface openings associated with karst geology have inhibited multiple infrastructure developments. Sinkholes are triggered by the alteration of the existing groundwater …
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Modeling karst aquifer response to rainfall
… excess in the form of potential energy from sinkhole sub-basins is input to element nodes and routed through a one-dimensional finite-element mesh to the karst spring represented by the last node in the finite element mesh. A fracture-flow equation derived from the Navier-Stokes equation uses …
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Electrical Conductivity and Resistivity Study of Heterogeneous Sediment in Inwood Hill Park, Manhattan, NY
… adjacent to the inlet contains several small sinkholes. Electrical resistivity and ground conductivity techniques were used in order to get an understanding of the hydrological processes of this field. It was hypothesized that the formation of the sinkholes is due to the tidal forcing of the …
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A stable isotope and macro-charcoal sediment record spanning the Pleistocene-Holocene transition from Maple Pond in the southern Shenandoah Valley, Virginia, USA
… of a 147-cm sediment core from Maple Pond, a sinkhole pond within the Shenandoah Valley Sinkhole Pond complex at the base of the Blue Ridge in central Virginia. The results document more than 15,000 years of continuous sediment accumulation, fire history, and environmental variability from the …
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Karst hazard analysis towards the development of predictive karst models for southern Ontario
… that Lake on the Mountain was formed from a sinkhole collapse. Sub-bottom acoustic profiling data was collected in order to image the lake bottom sediments and bedrock. Vertical bedrock features interpreted as solutionally enlarged fractures were taken as evidence for karst processes on the …
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Karstification of the Pennyroyal Plain Behind the Retreating Chester Escarpment: Warren, Simpson & Logan Counties, Kentucky
… drainage systems of an area of the Pennyroyal sinkhole plain of south central Kentucky. The degree of karstification of five area streams was studied to develop an understanding of the evolution of drainage as the landscape changes from a sandstone caprock plateau to a limestone sinkhole plain. …
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Seismic Expressions of Paleokarst
… Karst can be are expressed on seismic records as sinkholes, paleocave collapse, and tower morphologies. Seismic modeling indicates that karst can be modeled and imaged to better understand its subsurface architecture. High variance, negative curvature, bright amplitudes/localized bright spots …
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Geophysical Imaging of Karst Features in Missouri
… problems to structural problems especially sinkhole collapses. The result of the study showed that karst in Missouri is mostly formed as a result of piping of sediments through solution-widened joints, with a pattern showing that the joints/fractures are mostly filled with moist clay-sized …
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Hydrolgeologic Groundwater Sensitivity and Vulnerability Mapping in South Central Kentucky
… study area includes extensive limestone karst sinkhole plains, with groundwater that is generally extremely sensitive to contamination. Digitally Vectorized Geologic Quadrangles (DVGQs) were combined with elevation data to both identify hydrogeologic groundwater sensitivity regions and to …
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Spatio-temporal modeling of Louisiana land subsidence using high resolution geo-spatial data
… have also been validated by the Bayou Corne Sinkhole knowledge in this research (Mardia et al. 1998; Cusanza 2013; Jones and Blom 2014; Jones and Blom 2015). Based on the validated KKF results in this research, we have used some geo-statistics models, such as Geographically Weighted …
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