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Extracting Physically Realistic Pore Network Features From Xct Data And Investigating The Impact Of Pore Topology On Flow In Porous Media, Godfrey Mills
LSU Doctoral Dissertations
Synchrotron XCT imaging approaches applied in this study provides crucial information on the impact of image voxel resolution on image based simulation results and the characteristic length scales that can be extracted from XCT image data sets. The methods and results in this work provides a holistic approach in generating reliable and representative porous media flow and transport properties via image processing and pore scale simulations through XCT image data sets of porous media. This study also shows how XCT imaging, coupled with pore topological and morphological measures can be utilized in quantifying the differences, and/or similarities between a 2.5D …
Numerical Modeling Of Wetland Hydrodynamics, Agnimitro Chakrabarti
Numerical Modeling Of Wetland Hydrodynamics, Agnimitro Chakrabarti
LSU Doctoral Dissertations
Wave induced erosion accounts for as much as 26% of landloss in coastal Louisiana. This dissertation work, focuses on answering research questions relevant to the design of two shoreline protection methods (a) vegetated wetlands and (b) nearshore breakwaters. Two types of numerical models are used - the three-dimensional (3D) Navier Stokes Equation for small to medium scale experiments and a depth integrated, fully non-linear Boussinesq model for dispersive waves for larger, field scale studies. The former model provides insights into the 3D hydrodynamics of wave interaction with vegetation canopies and breakwaters, while the latter model focuses on the horizontal two …
Calibration Of Resistance Factors Needed In The Lrfd Design Of Drilled Shafts, Alicia Rae Fortier
Calibration Of Resistance Factors Needed In The Lrfd Design Of Drilled Shafts, Alicia Rae Fortier
LSU Master's Theses
This report presents the reliability-based analysis of the calibration of resistance factors for the Load and Resistance Factor Design (LRFD) of axially loaded drilled shafts. AASHTO’s 2012 LRFD Bridge Design Specifications recommends various resistance factors for the design of deep foundations; however, since these values are not specific to any one region, they are very conservative. For Louisiana or Mississippi, the adoption of such recommended resistance factors could substantially increase foundation sizes. Therefore, it is necessary to develop a database of drilled shaft load tests performed in the regions of Louisiana, Mississippi, and surrounding states with similar soil conditions. Sixty-nine …
Flood Damage And Shutdown Times For Industrial Process Facilities, Matthew Lane Flynn
Flood Damage And Shutdown Times For Industrial Process Facilities, Matthew Lane Flynn
LSU Master's Theses
The vulnerability of the Gulf Coast to inundation poses a real threat to both national security and the regional economy due to the concentration of the nation’s energy infrastructure throughout the waterways of the southeastern United States’ waterways. Mitigation efforts thus far have been qualitative and fail to provide raw, quantitative data to aid in the successful management of flooding liabilities. This paper proposes a novel approach to analyzing infrastructure susceptibility by means of a component-based approach to consequences posed by water-borne incursions. Systems are simplified to collections of components, each with a lowest-member elevation, thereby identifying the benchmark for …
A Framework To Incorporate A Structural Capacity Indicator Into The State Of Louisiana Pavement Management System, Omar Salaheldin Elbagalati
A Framework To Incorporate A Structural Capacity Indicator Into The State Of Louisiana Pavement Management System, Omar Salaheldin Elbagalati
LSU Doctoral Dissertations
Non-structural factors such as surface distresses and ride quality have been commonly used as the main indicators of in-service pavement conditions. In the last decade, the concept of implementing a structural condition index in Pavement Management System (PMS) to complement functional condition indices has become an important goal for many highway agencies. The Rolling Wheel Deflectometer (RWD) provides the ability to measure pavement deflection while operating at the posted speed limits causing no user delays. The objective of this study was two-fold. First, this study developed a model to predict pavement structural capacity at a length interval of 0.16 km …
Performance Evaluation Of Instrumented Geosynthetics Reinforced Paved Test Sections Built Over Weak Subgrade Using Accelerated Load Testing, Shadi Hanandeh
Performance Evaluation Of Instrumented Geosynthetics Reinforced Paved Test Sections Built Over Weak Subgrade Using Accelerated Load Testing, Shadi Hanandeh
LSU Doctoral Dissertations
Weak soil is a common problem in road construction. Whether it is a temporary access road or a permanent road built over a weak subgrade, a large deformation of the subgrade can lead to deterioration of the paved or unpaved surface. Geosynthetics offer a potentially economical solution for stabilizing roads built over weak soil. Three sets of testing programs were be conducted in this study.The first testing program includes conducting accelerated load testing of full-scale geosynthetic reinforced test lanes using rolling wheel load facility; the second program included conducting laboratory cyclic plate loading test on geosynthetic reinforced test sections constructed …
Bridge Rating Based On In-Situ Weigh-In-Motion And Health Monitoring Data, Dana Feng
Bridge Rating Based On In-Situ Weigh-In-Motion And Health Monitoring Data, Dana Feng
LSU Doctoral Dissertations
Parallel to the bridge design methodology changes from the Allowable Stress Design to the Load Factor Design, and then to the reliability based Load and Resistance Factor Design (LRFD), bridge load rating method has also been evolving. Applying the reliability theory to the bridge load rating is more complex than applying to the LRFD since any conservatism can have a significant effect on the assessment of bridge capacity, particularly in load posting and bridge replacement. Although the current Load and Resistant Factor Rating (LRFR) method applying the concept of reliability analyses, it uses very limited site-specific data due to practical …
Strengthening Shear Deficient Thin-Walled Steel Beams By Bonding Pultruded Gfrp Sections, Tuna Ulger
Strengthening Shear Deficient Thin-Walled Steel Beams By Bonding Pultruded Gfrp Sections, Tuna Ulger
LSU Doctoral Dissertations
Rehabilitation and retrofitting methods offer economical and feasible alternatives for upgrading aged and deficient structures. Structural strengthening using Fiber Reinforced Polymer (FRP) composites have been widely investigated by researchers and used in field applications. The main advantage of FRP composites is the superior mechanical properties they offer over traditional structural materials. One novel alternative of these retrofitting methods was developed at Louisiana State University and called “Strengthening-by-Stiffening” (SBS). In SBS, the external strengthening of shear deficient thin-walled steel structures is achieved by bonding pultruded FRP sections to buckling prone web panels. Contrary to the commonly used uniaxial tension resistance of …
Integration Of Naturalistic Driving Characteristics Into Crash Forecasting Models, Nicholas Hart
Integration Of Naturalistic Driving Characteristics Into Crash Forecasting Models, Nicholas Hart
LSU Master's Theses
While highway safety has steadily improved throughout the United States, highway crashes and the resulting losses continue to be a significant concern in Louisiana. Louisiana consistently lags behind the country in many key areas of highway safety. To improve the conditions of roads in Louisiana, the Louisiana Department of Transportation and Development (LADOTD) has begun to implement the Highway Safety Manual (HSM) to evaluate existing and expected safety conditions and how to allocate limited improvement funds. However, as the HSM was developed using aggregated national statistics, it is not always able to reflect the conditions present on specific Louisiana roadways. …
Aerodynamic Mitigation Of Roof Suction Using Solar Panels, Laura M. Iverson
Aerodynamic Mitigation Of Roof Suction Using Solar Panels, Laura M. Iverson
LSU Master's Theses
This thesis aims to evaluate the feasibility of solar panels to be used as aerodynamic mitigation devices to reduce roof suction caused by high-speed winds on flat-roof, low-rise buildings. Roof suction is caused by negative pressures resulting in uplift on the roof, due to the wind passing over the sharp edges of the roof. Suction is a common cause of failure for these types of flat-roof, low-rise buildings during extreme wind events such as hurricanes, as the uplift force can cause the roof to separate from the building. A variety of mitigation devices have been proposed in the literature to …
Conjunctive Management Of Water Resources Under Climate Change Projection Uncertainty, Amir Mani
Conjunctive Management Of Water Resources Under Climate Change Projection Uncertainty, Amir Mani
LSU Doctoral Dissertations
Goal of this study is to investigate the impacts of climate change projection uncertainty on conjunctive use of water resources. To pursue this goal first, a conjunctive-use model is developed for management of groundwater and surface water resources via mixed integer linear fractional programming (MILFP). The conjunctive management model maximizes the ratio of groundwater usage to reservoir water usage. A conditional head constraint is imposed to maintain groundwater sustainability. A transformation approach is introduced to transform the conditional head constraint into a set of mixed integer linear constraints in terms of groundwater head. A supply network is proposed to apply …
Coastal Flood Risk In A Changing Climate Along The Northern Gulf Of Mexico, Matthew Vernon Bilskie
Coastal Flood Risk In A Changing Climate Along The Northern Gulf Of Mexico, Matthew Vernon Bilskie
LSU Doctoral Dissertations
Coastal regions around the world are experiencing increased vulnerability from natural and manmade disasters. It is anticipated that coastal flood risk will increase due to the effects of climate change, and sea level rise (SLR) in particular. A dynamic, physics-based, framework to compute coastal flood inundation maps under various climate change scenarios was developed. The novel modeling system includes not only SLR, but considers future projections of shoreline evolution and primary dune morphology, upland migration of intertidal marsh, and land use land cover change. A present day hurricane storm surge model was generated for the Mississippi, Alabama, and Florida panhandle …
Evaluation Of Self-Healing Of Asphalt Concrete Through Induction Heating And Metallic Fibers, Yashwanth Pamulapati
Evaluation Of Self-Healing Of Asphalt Concrete Through Induction Heating And Metallic Fibers, Yashwanth Pamulapati
LSU Master's Theses
Healing by means of induction heating is promising, however the effectiveness of this technology is yet to be demonstrated due to limited studies on cracking damage and fracture resistance property recoveries after healing. The objective of this study was to test the hypothesis that a new generation of asphaltic materials could be artificially healed while in-service by embedding metallic fibers in the mix and by applying a magnetic field at the surface. To achieve this objective, an open-graded friction course (OGFC) was successfully designed and prepared to incorporate up to 5% steel and aluminum fibers by weight of the mix. …
Driver Engagement In Secondary Tasks: Behavioral Analysis And Crash Risk Assessment, Mengqiu Ye
Driver Engagement In Secondary Tasks: Behavioral Analysis And Crash Risk Assessment, Mengqiu Ye
LSU Master's Theses
Distracted driving has long been acknowledged as one of the leading causes of death or injury in roadway crashes. The focus of past research has been mainly on the change in driving performance due to distracted driving. However, only a few studies attempted to predict the type of distraction based on driving performance measures. In addition, past studies have proven that driving performance is influenced by the drivers’ socioeconomic characteristics, while not many studies have attempted to quantify that influence. In essence, this study utilizes the rich SHRP 2 Naturalistic Driving Study (NDS) database to (a) develop a model for …
The Influence Of Soil Properties On Marsh Edge Erosion, Cody Lee Johnson
The Influence Of Soil Properties On Marsh Edge Erosion, Cody Lee Johnson
LSU Master's Theses
Coastal Louisiana exhibits some of the highest rates of land conversion to open water in the world. This is most apparent in Terrebonne Bay, Barataria Bay, and Breton Sound (Couvillion et. al, 2011). The hypothesis is made that locally generated wind waves are responsible for the observed land loss. Recent research has attempted to relate the marsh edge erosion rate to wave energy flux density. Under the appropriate assumptions, this relationship is modeled reasonably well by a linear relationship between erosion rate and wave energy flux. Such a model is a valuable tool for coastal resource management. A deficiency of …
Hydrodynamic Simulations Of The Prototype Mississippi River And Expanded Small-Scale Physical Model To Investigate Impact Of Sea Level Rise, Linsey Brooke Olivier
Hydrodynamic Simulations Of The Prototype Mississippi River And Expanded Small-Scale Physical Model To Investigate Impact Of Sea Level Rise, Linsey Brooke Olivier
LSU Master's Theses
The Expanded Small-Scale Physical Model (ESSPM) is a distorted-scale, moveable bed model that will complement numerical and field studies studying management strategies in the lower ~140 miles of the Mississippi River and their effect on flooding, navigation and coastal restoration. It is recognized that relative sea level rise (RSLR), the combination of eustatic sea level rise (ESLR) and subsidence, will have an impact on the hydraulics and sediment transport in the lower River. However, it is physically impossible to replicate subsidence in the ESSPM; thus, future RSLR conditions will be experimentally simulated by raising Gulf of Mexico (GoM) levels commensurate …
Spatial Biodegradation Of Mc252 Crude Oil On A Coastal Headland Beach, Zachary Joseph Romaine
Spatial Biodegradation Of Mc252 Crude Oil On A Coastal Headland Beach, Zachary Joseph Romaine
LSU Master's Theses
Following the Deepwater Horizon oil spill in April, 2010, hard structures were constructed to deter oil migration into sensitive marsh areas behind Fourchon Beach, LA These hard structures created conditions for accumulation and burial of oil across an 8 foot deep beach vertical profile. Buried oil persists in these areas due to anaerobic conditions of beach groundwater. The objectives of this thesis are to compare the rate and extent of biodegradation of 3-ring PAHs in crude oil deposits from the surface and subsurface, and to investigate effects on beach groundwater after introduction of O2. Field samples were removed from 2011-2016 …
Quantitative Analysis Of Marine Transportation Systems Resiliency, Nafiseh Farhadi
Quantitative Analysis Of Marine Transportation Systems Resiliency, Nafiseh Farhadi
LSU Master's Theses
The United States Marine Transportation System (MTS) makes large contributions to the nation’s economy, security, safety, and quality of life. Strategic investment, planning, administrative and operational decisions by government at all levels are necessary to maintain the marine transportation system performance at all times, which in turn requires a technical approach and professional leadership based on research. This study describes the approach and results of an ongoing research effort to assess the resiliency of port operations following major disasters and other disruptive events. The work presented in this research uses a set of archival data from the United States Coast …
Hydrodynamic Modeling Of Newly Emergent Coastal Deltaic Floodplains, Alexandra Christensen
Hydrodynamic Modeling Of Newly Emergent Coastal Deltaic Floodplains, Alexandra Christensen
LSU Master's Theses
Coastal deltaic floodplains provide an important ecosystem service by removing or retaining nitrate from enriched riverine water. Wetland plants, soils, and microbes within these floodplains use nitrate through uptake, burial, and denitrification, thereby reducing the impact of nitrate on algal blooms and hypoxia in the Gulf of Mexico. However, these processes depend on the physical, biological, and chemical conditions within the floodplain. Understanding and characterizing the hydrodynamics of these systems and the relative impact of river, tide, and wind forcings are the first steps in understanding the biogeochemical processes controlling nitrate removal. Motivated by the desire to identify biogeochemical hotspots …
Effects Of Temperature Segregation On The Denisity And Mechanical Properties Of Asphalt Mixtures, Pranjal Pravin Phaltane
Effects Of Temperature Segregation On The Denisity And Mechanical Properties Of Asphalt Mixtures, Pranjal Pravin Phaltane
LSU Master's Theses
Temperature differentials (TD) between the target laydown and actual laydown temperatures of asphalt paving mixtures have been noticed and measured since the late 1990s. Since then, numerous research studies conducted on the phenomena found inconclusive conclusions regarding the effects of TD on the initial pavement quality and the long-term performance. The objective of this study was to evaluate the effects of different levels of TD on the initial quality and the long-term performance of asphalt pavements by evaluating the core density and laboratory measured performance characteristics, respectively. Through the evaluation, it was also aimed to ascertain and establish allowable TD …
Numerical Simulation Of Pile Installation And Following Setup Considering Soil Consolidation And Thixotropy, Firouz Rosti
Numerical Simulation Of Pile Installation And Following Setup Considering Soil Consolidation And Thixotropy, Firouz Rosti
LSU Doctoral Dissertations
During pile installation, the stresses and void ratios in the surrounding soils change significantly, creating large displacements, soil disturbance and the development of excess porewater pressures. The disturbed soils, especially fine grain soils, tend to regain their strength over time due to both the consolidation of the excess porewater pressure and thixotropic behavior of soil particles. In this research, the pile installation process and the subsequent consolidation, the thixotropy and load tests for several test piles were modeled using finite element (FE) model. A new elastoplastic constitutive model, which was developed based on the disturbed state concept (DSC) and critical …
Single-Family Housing Construction Cost In The Greater Baton Rouge Area, Justin Pierce Estes
Single-Family Housing Construction Cost In The Greater Baton Rouge Area, Justin Pierce Estes
LSU Master's Theses
Most research focused on housing costs has noted a paucity of empirical cost data for residential construction, and researchers have suggested that collecting these data for individual metropolitan areas is ideal. The goal of this study is to obtain these data and compare them to national average sources to determine how well national data represent local costs. Data collection included obtaining prices from big box stores and through a survey of local Baton Rouge residential contractors for material, square foot and assembly costs for the major components of a house (i.e. foundation, wall, roof). From the material cost data evaluated, …
Biodegradation Of Buried Mc252 Oil In Coastal Beach Sands By Pah Degraders In Response To Oxygen Biostimulation, Leeann Renee Fitch
Biodegradation Of Buried Mc252 Oil In Coastal Beach Sands By Pah Degraders In Response To Oxygen Biostimulation, Leeann Renee Fitch
LSU Master's Theses
Six years following the Deepwater Horizon oil spill, buried MC252 oil persists on a beach segment in Fourchon, LA due to the natural anaerobic conditions of tidal groundwater. A field trial of in situ aerobic bioremediation of buried oil began on July 2015. Oxygen was added to the subsurface using Waterloo emitters which deliver O2 through diffusion via pressurized tubing in fixed groundwater wells. The multi-well injection system provided sufficient oxygen concentration in the groundwater in the immediate area of the emitters, resulting in a shift in the composition of the diverse, halophilic, hydrocarbon-degrading microbial population. Stable isotopic and radiocarbon …
Evaluation And Validation Of A Model To Predict The Effect Of Asphalt Mixtures And Vehicle Speed On Fuel Consumption Excess, Nirmal Dhakal
Evaluation And Validation Of A Model To Predict The Effect Of Asphalt Mixtures And Vehicle Speed On Fuel Consumption Excess, Nirmal Dhakal
LSU Master's Theses
The primary objective of this study is to evaluate the effects of asphalt concrete (AC) properties and vehicle speed on fuel consumption excess using a Three-Dimensional (3D) Finite Element (FE) approach. Secondarily, the effect of pavement design characteristics on energy dissipation was studied. Finite element modeling was used to simulate three flexible pavements typically used for low traffic volume, medium traffic volume, and high traffic volume. The effect of asphalt concrete mixes with different binders and varying percentages of Reclaimed Asphalt Pavement (RAP) on fuel consumption excess was studied. The FE models were validated based on field stress and strain …