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- Title
- Contribution of on-site treatment and disposal systems on coastal nutrient loading.
- Creator
- Morin, Frederic., Florida Atlantic University, Meeroff, Daniel E., College of Engineering and Computer Science, Department of Civil, Environmental and Geomatics Engineering
- Abstract/Description
-
When onsite treatment and disposal systems (OSTDS) are not properly sited, they can be a potential risk to public health and a source of environmental degradation. In Florida, OSTDS location has proven to be problematic from a water resources perspective. The objective of this study is to quantify the pollutant loading contributions from OSTDS on coastal canals, with regard to nutrients and pathogens indicators (Total Coliform, E. coli, Enterococcus). Two similar single-family residential...
Show moreWhen onsite treatment and disposal systems (OSTDS) are not properly sited, they can be a potential risk to public health and a source of environmental degradation. In Florida, OSTDS location has proven to be problematic from a water resources perspective. The objective of this study is to quantify the pollutant loading contributions from OSTDS on coastal canals, with regard to nutrients and pathogens indicators (Total Coliform, E. coli, Enterococcus). Two similar single-family residential locations were identified: Dania Beach, FL (with 100% OSTDS) and Hollywood, FL (with 100% sewer). Field studies were conducted during the height of the wet and dry seasons. During the wet season, surface water quality of the canal was affected by an OSTDS contribution with higher levels of nutrients and pathogens indicators. During the dry season, no OSTDS impact was detected. OSTDS appear to work properly during the dry season.
Show less - Date Issued
- 2005
- PURL
- http://purl.flvc.org/fcla/dt/13224
- Subject Headings
- Estuarine ecology, Sewage disposal--Florida, Sewage--Purification--Nitrogen removal, Land treatment of wastewater--Florida
- Format
- Document (PDF)
- Title
- Effect of elevated temperature and fire on structural elements retrofitted by carbon fiber reinforced polymer composites.
- Creator
- Young, Jody David, Jr., Florida Atlantic University, Reddy, Dronnadula V., College of Engineering and Computer Science, Department of Civil, Environmental and Geomatics Engineering
- Abstract/Description
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This thesis presents an experimental investigation for evaluating effects of fire exposure on properties of structural elements retrofitted by carbon fiber reinforced polymers. Mechanical properties of CFRP-strengthened reinforced concrete members, protected with secondary insulation, were investigated, before and after (residual) direct fire exposure. Direct fire contact resulted in a reduction in capacity of 9-20% for CFRP-strengthened RC beams, and 15-34% for CFRP-strengthened RC columns....
Show moreThis thesis presents an experimental investigation for evaluating effects of fire exposure on properties of structural elements retrofitted by carbon fiber reinforced polymers. Mechanical properties of CFRP-strengthened reinforced concrete members, protected with secondary insulation, were investigated, before and after (residual) direct fire exposure. Direct fire contact resulted in a reduction in capacity of 9-20% for CFRP-strengthened RC beams, and 15-34% for CFRP-strengthened RC columns. Furthermore, a dimensional analysis was developed for a heat transfer relationship between full and small-scale specimens, allowing a ¼ exposure time reduction for the latter. Results from experimental investigations demonstrate benefits of employing secondary fire protection to CFRP-strengthened structures, in spite of the glass transition temperature being exceeded in the early stages of the elevated-temperature exposure. Therefore, it is suggested, that fire protection is necessary for a CFRP-strengthened structural member to retain integrity throughout the duration of the fire exposure, and upon return to ambient temperature.
Show less - Date Issued
- 2006
- PURL
- http://purl.flvc.org/fcla/dt/13322
- Subject Headings
- Buildings--Repair and reconstruction, Reinforced concrete, Fiber reinforced plastics, Fire resistant materials, Thermodynamics, Heat engineering, Concrete--Effect of temperature on
- Format
- Document (PDF)
- Title
- Primary and secondary compression behavior of Florida organic soils.
- Creator
- Riedy, Kristopher W., Florida Atlantic University, Sobhan, Khaled, College of Engineering and Computer Science, Department of Civil, Environmental and Geomatics Engineering
- Abstract/Description
-
A comprehensive laboratory investigation was conducted to evaluate the primary and secondary compression behavior of undisturbed organic silts and peats obtained from 11 locations along SR 15/US 98 in Palm Beach County, Florida. A total of 43 consolidation tests were performed. The primary objectives were as follows: (i) to conduct a series of standard consolidation tests to determine the Compression Index, Cc, and the Coefficient of Consolidation, cnu; (ii) to determine the Secondary...
Show moreA comprehensive laboratory investigation was conducted to evaluate the primary and secondary compression behavior of undisturbed organic silts and peats obtained from 11 locations along SR 15/US 98 in Palm Beach County, Florida. A total of 43 consolidation tests were performed. The primary objectives were as follows: (i) to conduct a series of standard consolidation tests to determine the Compression Index, Cc, and the Coefficient of Consolidation, cnu; (ii) to determine the Secondary Compression Index, Calpha, at stress levels (sigmanu'/sigmap') ranging from 0.30 to 1.15; and (iii) to employ the well-known Time-Stress-Compressibility concept to establish a unique relationship between C alpha and Cc. It was found that for all practical purposes, the Calpha/C c ratio at any stress level is 0.03, which is consistent with the values reported in the literature for similar soils. A constant Calpha/Cc ratio provides an approximation of Calpha once C c is determined from a standard consolidation test, and without the need of ongoing laboratory testing to predict long-term settlement.
Show less - Date Issued
- 2006
- PURL
- http://purl.flvc.org/fcla/dt/13386
- Subject Headings
- Soil consolidation--Measurement--Florida, Soil mechanics--Florida--Palm Beach County, Soils--Testing
- Format
- Document (PDF)
- Title
- Sediment exchange in tidal inlets.
- Creator
- Merz, Clifford Ronald., Florida Atlantic University, Scarlatos, Panagiotis (Pete) D., College of Engineering and Computer Science, Department of Civil, Environmental and Geomatics Engineering
- Abstract/Description
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Sediment exchange characteristics of tidal inlets subjected to tidal excitations are investigated and the results compared to field data measured at Jupiter Inlet, Florida. A specially written computer program combines inlet/nearshore hydrodynamic expressions with bed-load and suspended load sediment transport relationships to examine the building mechanisms of the near-shore tidal ebb shoal. The ebb tidal flow is modeled as a turbulent, plane jet which includes lateral mixing and entrainment...
Show moreSediment exchange characteristics of tidal inlets subjected to tidal excitations are investigated and the results compared to field data measured at Jupiter Inlet, Florida. A specially written computer program combines inlet/nearshore hydrodynamic expressions with bed-load and suspended load sediment transport relationships to examine the building mechanisms of the near-shore tidal ebb shoal. The ebb tidal flow is modeled as a turbulent, plane jet which includes lateral mixing and entrainment, bottom friction, and offshore bathymetric changes. Flood tidal flow is modeled as a potential flow sink with the water being drawn into the inlet from one or more dominant offshore areas depending on the offshore bottom slope. Sediment transport expressions are evaluated at various locations within the offshore flow field and the sediment deposition depth is calculated at that location over one tidal cycle. Model results are plotted and compared to field data for analysis.
Show less - Date Issued
- 1995
- PURL
- http://purl.flvc.org/fcla/dt/15206
- Subject Headings
- Tides, Marine sediments, Sediment transport--Florida--Jupiter Inlet, Inlets
- Format
- Document (PDF)
- Title
- Evaluation of future design rainfall extremes and characteristics using multiple-model and multiple-scenario climate change models.
- Creator
- Dezmain, Celyn, Teegavarapu, Ramesh, College of Engineering and Computer Science, Department of Civil, Environmental and Geomatics Engineering
- Abstract/Description
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Climate models are common tools for developing design standards in the hydrologic field; however, these models contain uncertainties in multi-model and scenario selections. Along with these uncertainties, biases can be attached to the models. Such biases and uncertainties can present difficulties in predicting future extremes. These hydrologic extremes are believed to be non-stationary in character. Only in the recent past have model users come to terms that the current hydrologic designs are...
Show moreClimate models are common tools for developing design standards in the hydrologic field; however, these models contain uncertainties in multi-model and scenario selections. Along with these uncertainties, biases can be attached to the models. Such biases and uncertainties can present difficulties in predicting future extremes. These hydrologic extremes are believed to be non-stationary in character. Only in the recent past have model users come to terms that the current hydrologic designs are no longer relevant due to their assumption of stationarity. This study describes a systematic method of selecting a best fit model in relationship to location and time, along with the use of that best fit model for evaluation of future extremes. Rain gage stations throughout Florida are used to collect daily precipitation data used in extreme precipitation and quantitative indices. Through these indices conclusions are made on model selection and future extremes, as they relate to hydrologic designs.
Show less - Date Issued
- 2013
- PURL
- http://purl.flvc.org/fau/fd/FA0004016
- Subject Headings
- Climatic changes -- Environmental aspects, Climatic extremes, Hydrologic models, Percipitation (Meteorology) -- Measurement
- Format
- Document (PDF)
- Title
- Strength and durability of fly ash-based fiber-reinforced geopolymer concrete in a simulated marine environment.
- Creator
- Martinez Rivera, Francisco Javier, Sobhan, Khaled, College of Engineering and Computer Science, Department of Civil, Environmental and Geomatics Engineering
- Abstract/Description
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This research is aimed at investigating the corrosion durability of polyolefin fiber-reinforced fly ash-based geopolymer structural concrete (hereafter referred to as GPC, in contradistinction to unreinforced geopolymer concrete referred to as simply geopolymer concrete), where cement is completely replaced by fly ash, that is activated by alkalis, sodium hydroxide and sodium silicate. The durability in a marine environment is tested through an electrochemical method for accelerated corrosion...
Show moreThis research is aimed at investigating the corrosion durability of polyolefin fiber-reinforced fly ash-based geopolymer structural concrete (hereafter referred to as GPC, in contradistinction to unreinforced geopolymer concrete referred to as simply geopolymer concrete), where cement is completely replaced by fly ash, that is activated by alkalis, sodium hydroxide and sodium silicate. The durability in a marine environment is tested through an electrochemical method for accelerated corrosion. The GPC achieved compressive strengths in excess of 6,000 psi. Fiber reinforced beams contained polyolefin fibers in the amounts of 0.1%, 0.3%, and 0.5% by volume. After being subjected to corrosion damage, the GPC beams were analyzed through a method of crack scoring, steel mass loss, and residual flexural strength testing. Fiber reinforced GPC beams showed greater resistance to corrosion damage with higher residual flexural strength. This makes GPC an attractive material for use in submerged marine structures.
Show less - Date Issued
- 2013
- PURL
- http://purl.flvc.org/fau/fd/FA0004037
- Subject Headings
- Concrete mixing -- Quality control, Green chemistry, Polymer composites, Reinforced concrete -- Corrosion -- Testing, Reinforced concrete construction
- Format
- Document (PDF)
- Title
- Influences of decadal and multi-decadal oscillations on regional precipitation extremes and characteristics.
- Creator
- Pierce, Milla, Teegavarapu, Ramesh, College of Engineering and Computer Science, Department of Civil, Environmental and Geomatics Engineering
- Abstract/Description
-
Three major teleconnections, Atlantic Multidecadal Oscillation (AMO), North Atlantic Oscillation (NAO), and the Pacific Decadal Oscillation (PDO), in warm and cool phases, effect precipitation in Florida. The effects of the oscillation phases on the precipitation characteristics are analyzed by using long-term daily precipitation data, on different temporal (annual, monthly, and daily) and spatial scales, utilizing numerous indices, and techniques. Long-term extreme precipitation data for 9...
Show moreThree major teleconnections, Atlantic Multidecadal Oscillation (AMO), North Atlantic Oscillation (NAO), and the Pacific Decadal Oscillation (PDO), in warm and cool phases, effect precipitation in Florida. The effects of the oscillation phases on the precipitation characteristics are analyzed by using long-term daily precipitation data, on different temporal (annual, monthly, and daily) and spatial scales, utilizing numerous indices, and techniques. Long-term extreme precipitation data for 9 different durations is used to examine the effects of the oscillation phases on the rainfall extremes, by employing different parametric and non-parametric statistical tests, along with Depth-Duration- Frequency analysis. Results show that Florida will experience higher rainfall when AMO is in the warm phase, except in the panhandle and south Florida, while PDO cool phase is positively correlated with precipitation, except for the southern part of the peninsula.
Show less - Date Issued
- 2013
- PURL
- http://purl.flvc.org/fau/fd/FA0004046
- Subject Headings
- Climatic change -- Environmental aspects, Climatic extremes, Hydrologic models, Hydrometeorology, Precipitation (Meteorology) -- Measurement
- Format
- Document (PDF)
- Title
- Transportation operation and safety comparison between unsignalized/signalized offset t-intersections, two-lane roundabout, and modified roundabout.
- Creator
- Fleming, Brandon, Kaisar, Evangelos I., Florida Atlantic University, College of Engineering and Computer Science, Department of Civil, Environmental and Geomatics Engineering
- Abstract/Description
-
Traditional intersections have always caused congestion, delay, and accidents. There are numerous geometric intersection designs that best fit each situation. This study performed an operational and safety comparison with unsignalized/signalized offset, Tintersections, a two-lane roundabout, and a modified roundabout to decrease the overall travel delay and increase the safety using a case study. Using data from a government source, all designs were tested in a calibrated micro simulation...
Show moreTraditional intersections have always caused congestion, delay, and accidents. There are numerous geometric intersection designs that best fit each situation. This study performed an operational and safety comparison with unsignalized/signalized offset, Tintersections, a two-lane roundabout, and a modified roundabout to decrease the overall travel delay and increase the safety using a case study. Using data from a government source, all designs were tested in a calibrated micro simulation model and traffic signals were optimized using a signal optimization platform. Each design was tested with various balancing schemes, left turn percentages, and hourly volumes to determine the failure point. The unsignalized/signalized offset T-intersections, two-lane roundabout, and modified roundabout were compared by throughputs, travel delay, and travel time. After analysis, it was determined that the modified roundabout performed the best out of any design. All approaches had minimum travel delay while reducing the number of conflict points considerably with the modified roundabout.
Show less - Date Issued
- 2014
- PURL
- http://purl.flvc.org/fau/fd/FA00004110, http://purl.flvc.org/fau/fd/FA00004110
- Subject Headings
- Roads -- Interchanges and intersections -- Safety measures, Traffic circles -- Safety measures, Traffic safety, Traffic signs and signals -- Design
- Format
- Document (PDF)
- Title
- Durability of a recycled aggregate concrete base course material under coupled environmental exposure and cyclic.
- Creator
- Gonzalez, Lillian, Sobhan, Khaled, Florida Atlantic University, College of Engineering and Computer Science, Department of Civil, Environmental and Geomatics Engineering
- Abstract/Description
-
Long term durability is a major concern for wide-scale use of recycled aggregate materials in civil engineering construction. The purpose of this study is to provide an insight into the damaging effects of combined wet-dry cycles and repeated mechanical loading in a recycled aggregate concrete (RAC) base course material made from recycled crushed concrete aggregate and cement. A coordinated experimental program followed by a mechanistic pavement modeling and life cycle analysis was conducted...
Show moreLong term durability is a major concern for wide-scale use of recycled aggregate materials in civil engineering construction. The purpose of this study is to provide an insight into the damaging effects of combined wet-dry cycles and repeated mechanical loading in a recycled aggregate concrete (RAC) base course material made from recycled crushed concrete aggregate and cement. A coordinated experimental program followed by a mechanistic pavement modeling and life cycle analysis was conducted as part of this research study. This laboratory investigation was divided into three phases each consisting of both wet-dry exposed specimens (WD), and control or non wet-dry exposed specimens (NWD). Phase I experiments involved monotonic loading tests under compression and flexure to evaluate the strength properties. Phase II involved testing a total of 108 cylindrical specimens in cyclic compressive loading at three different stress ratios. After each regime of cyclic loading, residual compressive strengths were determined. In addition, the load-deformation hysteresis loops and the accumulated plastic deformation were continuously monitored through all loading cycles. Phase III included a flexural fatigue test program on 39 beam specimens, and fracture testing program on 6 notched beam specimens, each one having 19-mm initial notch. Traditional SR-N curves, relating the Stress Ratio (SR) with the number of cycles to failure (N or Nf), were developed. Fatigue crack growth rate and changes in Stress Intensity Factors were obtained to determine Paris Law constants and fracture toughness. A mechanistic analysis of a typical highway pavement incorporating RAC base was performed with KENPAVE program, followed by a Life Cycle Analysis (LCA) using the GaBi software. It was found that the specimens subjected to wet-dry cycles suffered significantly higher damage expressed in terms of accumulated plastic deformation, and loss of residual compressive strength, modulus, fatigue endurance limit, and design life, compared to specimens not exposed to wet-dry cycles. Although such degradation in material properties are important considerations in pavement design, a concurrent Life Cycle Analysis demonstrated that recycled aggregate concrete base course still holds promise as an alternative construction material from environmental stand point.
Show less - Date Issued
- 2014
- PURL
- http://purl.flvc.org/fau/fd/FA00004116, http://purl.flvc.org/fau/fd/FA00004116
- Subject Headings
- Aggregates (Building materials ) -- Recycling, Concrete -- Mechanical properties, Construction and demolition debris -- Recycling, Structural engineering, Sustainable construction, Waste products as road materials
- Format
- Document (PDF)
- Title
- Investigation of the impact of junctions on the frequency of road crashes in urban areas.
- Creator
- Kapetanakis, Konstantinos, Kaisar, Evangelos I., Florida Atlantic University, College of Engineering and Computer Science, Department of Civil, Environmental and Geomatics Engineering
- Abstract/Description
-
The huge financial and societal cost associated with traffic crashes and the fact that more than half of them occur at junctions, revealed the need for further research in the field of junction safety. This research aims to investigate the quantitative impact of junctions in relation to other selected parameters, on the frequency of road crashes in urban areas in the State of Florida. Mathematical models were developed with the use of loglinear analysis method for different traffic volumes in...
Show moreThe huge financial and societal cost associated with traffic crashes and the fact that more than half of them occur at junctions, revealed the need for further research in the field of junction safety. This research aims to investigate the quantitative impact of junctions in relation to other selected parameters, on the frequency of road crashes in urban areas in the State of Florida. Mathematical models were developed with the use of loglinear analysis method for different traffic volumes in and out of junction. In addition, sensitivity analysis was performed in order to better understand the impact of selected parameters to the total number of crashes. The analysis has led to several conclusions such as that angle and left turn collisions have much higher probability of occurrence at junctions and that crashes which occur at junctions are much more probable for low and medium volumes compared to no-junctions.
Show less - Date Issued
- 2014
- PURL
- http://purl.flvc.org/fau/fd/FA00004128, http://purl.flvc.org/fau/fd/FA00004128
- Subject Headings
- Roads -- Intersections and interchanges -- Safety measures, Traffic safety -- Mathematical models
- Format
- Document (PDF)
- Title
- Development of functional relationships between radar and rain gage data using inductive modeling techniques.
- Creator
- Peters, Delroy., College of Engineering and Computer Science, Department of Civil, Environmental and Geomatics Engineering
- Abstract/Description
-
Traditional methods such as distance weighing, correlation and data driven methods have been used in the estimation of missing precipitation data. Also common is the use of radar (NEXRAD) data to provide better spatial distribution of precipitation as well as infilling missing rain gage data. Conventional regression models are often used to capture highly variant nonlinear spatial and temporal relationships between NEXRAD and rain gage data. This study aims to understand and model the...
Show moreTraditional methods such as distance weighing, correlation and data driven methods have been used in the estimation of missing precipitation data. Also common is the use of radar (NEXRAD) data to provide better spatial distribution of precipitation as well as infilling missing rain gage data. Conventional regression models are often used to capture highly variant nonlinear spatial and temporal relationships between NEXRAD and rain gage data. This study aims to understand and model the relationships between radar (NEXRAD) estimated rainfall data and the data measured by conventional rain gages. The study is also an investigation into the use of emerging computational data modeling (inductive) techniques and mathematical programming formulations to develop new optimal functional approximations. Radar based rainfall data and rain gage data are analyzed to understand the spatio-temporal associations, as well as the effect of changes in the length or availability of data on the models. The upper and lower Kissimmee basins of south Florida form the test-bed to evaluate the proposed and developed approaches and also to check the validity and operational applicability of these functional relationships among NEXRAD and rain gage data for infilling of missing data.
Show less - Date Issued
- 2008
- PURL
- http://purl.flvc.org/FAU/166454
- Subject Headings
- Weather control, Mathematical models, Radar meteorology, Technological innovations, Precipitation (Meteorology), Measurement, Weather forecasting, Technological innovations
- Format
- Document (PDF)
- Title
- Farfield modeling of the Boynton Inlet plume using sulfur hexafluoride as tracer.
- Creator
- Pire-Schmidt, Joaquin., College of Engineering and Computer Science, Department of Civil, Environmental and Geomatics Engineering
- Abstract/Description
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The analysis and modeling of the coastal farfield behavior of inlet discharge plumes is the key to understanding the fate of pollutants discharged into the ocean. These plumes disperse in chaotic and unpredictable patterns. Theoretical models are based on the average conditions and calibrated to the results of tracer studies. Data and models for freshwater discharges in coastal ocean systems are limited because of the lack of adequate tracers. On February, 2007, a tracer study was conducted...
Show moreThe analysis and modeling of the coastal farfield behavior of inlet discharge plumes is the key to understanding the fate of pollutants discharged into the ocean. These plumes disperse in chaotic and unpredictable patterns. Theoretical models are based on the average conditions and calibrated to the results of tracer studies. Data and models for freshwater discharges in coastal ocean systems are limited because of the lack of adequate tracers. On February, 2007, a tracer study was conducted on the Boynton Inlet, Florida, using sulfur hexafluoride (SF6) tracer. The objective of this study is to provide methods of analysis for the sample data collected during the experiment. The detected tracer concentrated in a bolus that migrated north of the inlet at velocities lower than predicted by the current data. The plume was successfully modeled with a Gaussian plume model, with 90% of the SF6 predictions having less than 4.6 pptr error.
Show less - Date Issued
- 2009
- PURL
- http://purl.flvc.org/FAU/186771
- Subject Headings
- Plumes (Fluid dynamics), Water, Pollution, Sedimentation and deposition, Environmental aspects, Pollution, Mathematical models
- Format
- Document (PDF)
- Title
- A mixed integer nonlinear programming model to optimize the use of aircraft deicing and anti-icing fluids.
- Creator
- Ornitz, Scott E., College of Engineering and Computer Science, Department of Civil, Environmental and Geomatics Engineering
- Abstract/Description
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A detailed study is proposed for understanding the use of aircraft deicing and anti-icing fluids (ADAF) and optimal use of these fluids in airport operations. A detailed literature review of past and current technologies is conducted and possible opportunities to improve the use of ADAF and relevant recommendations are derived. Mathematical optimization models (e.g. MINLP with binary variables) based on a variety of objectives, which deal with exhaustive sets of system constraints are...
Show moreA detailed study is proposed for understanding the use of aircraft deicing and anti-icing fluids (ADAF) and optimal use of these fluids in airport operations. A detailed literature review of past and current technologies is conducted and possible opportunities to improve the use of ADAF and relevant recommendations are derived. Mathematical optimization models (e.g. MINLP with binary variables) based on a variety of objectives, which deal with exhaustive sets of system constraints are formulated, developed and applied to case studies. One real-life case study area which routinely carries out aircraft deicing is used for testing the mathematical optimization formulations for optimal use of fluids under budgetary and environmental compliance constraints. Based on the recommendations from one of the best optimization model formulations it is hoped that it will be used for a real-time implementation. Results from these formulations show the models to be robust and applicable.
Show less - Date Issued
- 2009
- PURL
- http://purl.flvc.org/FAU/192987
- Subject Headings
- Deicing chemicals, Testing, Airplanes, Ice prevention, Programming (Mathematics)
- Format
- Document (PDF)
- Title
- A comparison of non-traditional instersection designs using microscopic simulation.
- Creator
- Chery, Steve, College of Engineering and Computer Science, Department of Civil, Environmental and Geomatics Engineering
- Abstract/Description
-
In light of the growing traffic demand and the futility of the conventional solutions, many states have been considering alternative intersection designs. Researchers have demonstrated the benefits of several unconventional intersection designs and their implementation at different sites throughout the United States and abroad have delivered significant improvement in traffic compared to the conventional intersections. A signalized and un-signalized roundabout, a Continuous Flow Intersection,...
Show moreIn light of the growing traffic demand and the futility of the conventional solutions, many states have been considering alternative intersection designs. Researchers have demonstrated the benefits of several unconventional intersection designs and their implementation at different sites throughout the United States and abroad have delivered significant improvement in traffic compared to the conventional intersections. A signalized and un-signalized roundabout, a Continuous Flow Intersection, and a Parallel Flow Intersection have been evaluated and compared in this research as viable alternatives to the traditional single intersection. Using micro-simulation platforms, AIMSUN 6.0 and VISSIM 5.10, models of each intersection are evaluated for low, medium, and high entrance volumes. The analysis revealed that the Roundabout performs better at low entering volumes while the Continuous flow yields better results at high volumes.
Show less - Date Issued
- 2010
- PURL
- http://purl.flvc.org/FAU/1927863
- Subject Headings
- Traffic engineering, Streets, Design, City planning
- Format
- Document (PDF)
- Title
- Transit signal priority for emergency evacuation: mitigating disaster.
- Creator
- Parr, Scott A., College of Engineering and Computer Science, Department of Civil, Environmental and Geomatics Engineering
- Abstract/Description
-
The goal of this research is to answer a single question. During an urban evacuation, is it advisable for regional planners to allow transit units signal priority in cases where police assisted traffic controls are not an option? Standard practice for emergency evacuation is to place police officers at intersection throughout the evacuation area. However, this is not always an option where environmental factors such as the presence of fire, chemical plume, radioactive fallout (nuclear...
Show moreThe goal of this research is to answer a single question. During an urban evacuation, is it advisable for regional planners to allow transit units signal priority in cases where police assisted traffic controls are not an option? Standard practice for emergency evacuation is to place police officers at intersection throughout the evacuation area. However, this is not always an option where environmental factors such as the presence of fire, chemical plume, radioactive fallout (nuclear contaminated wind and dust) do not permit police presence. Results from a case study conducted on Washington D.C. show that it would take four non-prioritized transit units to accomplish the same task as three prioritized vehicles. Furthermore, allowing transit signal priority during an urban evacuation has little to no effect on evacuation clearance time or evacuee travel time. Moreover, when transit signal priority is restricted to operate only on evacuation routes, evacuee travel and delay time decreases.
Show less - Date Issued
- 2010
- PURL
- http://purl.flvc.org/FAU/1930488
- Subject Headings
- Emergency transportation, Government policy, Emergency management, Evacuation of civilians, Electronic traffic controls
- Format
- Document (PDF)
- Title
- Rain-wind-induced cable vibrations in cable-stayed bridges.
- Creator
- Calle, Oscar F., Reddy, Dronnadula V., Florida Atlantic University, College of Engineering and Computer Science, Department of Civil, Environmental and Geomatics Engineering
- Abstract/Description
-
This research is aimed at investigating and analyzing the rain-windinduced cable vibration phenomena experienced in cables of cable-stayed bridges and also the countermeasures employed by engineers to mitigate the large-amplitude vibration problem reported by various researchers around the world. In order to investigate the problem of the water rivulet creation at the top of the cable surface, a single-degree-of-freedom (SDOF) analytical model was developed and analyzed. This thesis studies...
Show moreThis research is aimed at investigating and analyzing the rain-windinduced cable vibration phenomena experienced in cables of cable-stayed bridges and also the countermeasures employed by engineers to mitigate the large-amplitude vibration problem reported by various researchers around the world. In order to investigate the problem of the water rivulet creation at the top of the cable surface, a single-degree-of-freedom (SDOF) analytical model was developed and analyzed. This thesis studies the aerodynamic instability of cables in cable-stayed bridges by doing literature review of a typical in-situ test, developing a single degree-of-freedom (SDOF) analytical model, and an ANSYS finite element model. Furthermore, a linear viscous damper that acts as a countermeasure to the large amplitudes of vibration is reported and analyzed. The suppression characteristics and damper effectiveness of such countermeasure are summarized.
Show less - Date Issued
- 2014
- PURL
- http://purl.flvc.org/fau/fd/FA00004271, http://purl.flvc.org/fau/fd/FA00004271
- Subject Headings
- Bridges -- Aerodynamics, Bridges -- Vibration -- Prevention, Cable stayed bridges -- Maintenance and repair, Damping (Mechanics), Structural dynamics, Vibration -- Mathematical models, Wind resistant design
- Format
- Document (PDF)
- Title
- Investigating the impact of recurrent and non-recurrent congestion on highway operations.
- Creator
- Ferri, Marcello G., Kaisar, Evangelos I., Florida Atlantic University, College of Engineering and Computer Science, Department of Civil, Environmental and Geomatics Engineering
- Abstract/Description
-
Traffic congestion is one of the most concerning issues in the transportation system. Recurrent congestion and non-recurrent congestion are explored in this research. This research will investigate one of the most concerning issues with the transportation system, congestion, using an overall delay analysis study. A developed fused database program was used to access and analyze the complete database data. Two online databases were used for obtaining traffic, incident and weather data. Eleven...
Show moreTraffic congestion is one of the most concerning issues in the transportation system. Recurrent congestion and non-recurrent congestion are explored in this research. This research will investigate one of the most concerning issues with the transportation system, congestion, using an overall delay analysis study. A developed fused database program was used to access and analyze the complete database data. Two online databases were used for obtaining traffic, incident and weather data. Eleven different scenarios such as peak-hours, rain scenario, incidents scenario, and work zone scenario were developed for the analysis. An overall delay study was performed on all scenarios to find the impact recurring and non-recurring congestion on the highway. The results of this research were interesting for future adjustment and improvements on the two segments of highways selected.
Show less - Date Issued
- 2014
- PURL
- http://purl.flvc.org/fau/fd/FA00004283, http://purl.flvc.org/fau/fd/FA00004283
- Subject Headings
- Intelligent transportation systems, Traffic congestion, Traffic estimation, Traffic flow, Transportation -- Finance -- Decision making, Transportation -- Finance -- Decision making
- Format
- Document (PDF)
- Title
- Fire resistance of corroded structural concrete.
- Creator
- Martinez, Fernando Jose, Reddy, Dronnadula V., Florida Atlantic University, College of Engineering and Computer Science, Department of Civil, Environmental and Geomatics Engineering
- Abstract/Description
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One of the major causes of structural repairs worldwide is the corrosion of reinforced concrete structures, such as residential buildings and piers, which are exposed to harsh marine environments. This investigation aims to provide experimental evidence of the fire resistance of corroded high strength reinforced concrete. For this, 14 reinforced concrete beams of three different concrete mix designs (different strengths) were prepared along with concrete cylinders for compression strength...
Show moreOne of the major causes of structural repairs worldwide is the corrosion of reinforced concrete structures, such as residential buildings and piers, which are exposed to harsh marine environments. This investigation aims to provide experimental evidence of the fire resistance of corroded high strength reinforced concrete. For this, 14 reinforced concrete beams of three different concrete mix designs (different strengths) were prepared along with concrete cylinders for compression strength testing (ASTM C39). After proper moist curing, all beams were corroded, in two phases, with impressed current, then “crack scored ”for corrosion evaluation, after which half were exposed to fire, also in two phases, following the ASTM E-119-12 time-temperature curve, using a gas kiln. The fire damage was evaluated and compared between phases by using Ultrasonic Pulse Velocity technology. Finally, all specimens were tested for flexural strength by using the third-point loading method (ASTM C78) and the effects of fire on the corroded beams were analyzed according to the level of corrosion.
Show less - Date Issued
- 2014
- PURL
- http://purl.flvc.org/fau/fd/FA00004304, http://purl.flvc.org/fau/fd/FA00004304
- Subject Headings
- Concrete -- Effect of temperature on, Fire resistant materials, Reinforced concrete -- Corrosion, Thermodynamics
- Format
- Document (PDF)
- Title
- Risk of injection using reclaimed water for aquifer recharge using rotavirus as surrogate contaminant.
- Creator
- Phonpornwithoon, Pollop, Bloetscher, Frederick, Florida Atlantic University, College of Engineering and Computer Science, Department of Civil, Environmental and Geomatics Engineering
- Abstract/Description
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Groundwater aquifers are precious resources that has been serving human consumption for many centuries. This resource is pristine in comparison with surface waters such as lakes and canals, however, as population grows exponentially so does the demand for groundwater and the need to study the potential of groundwater replenishment programs. The injection of treated water or wastewater into an aquifer is a method to protect this resource for current and future generations. Health concerns...
Show moreGroundwater aquifers are precious resources that has been serving human consumption for many centuries. This resource is pristine in comparison with surface waters such as lakes and canals, however, as population grows exponentially so does the demand for groundwater and the need to study the potential of groundwater replenishment programs. The injection of treated water or wastewater into an aquifer is a method to protect this resource for current and future generations. Health concerns would be expected since migration of water of “impaired quality” can affect the drinking water by contamination. Regulatory barriers resulting from the perceived risks of adverse health effects from pathogens such as viruses have limited the concept of this impaired water resources from being used for groundwater replenishment programs. The objective of this study is to examine the risk assessment using computational modeling with MODFLOW and MT3D groundwater transport simulation. The results from the simulation showed that after two years, the risk of contamination based on concentration contours from the injection well to the production wellfields for the City of Hollywood stabilized below 10- 6. The risk assessment provided important aspect to demonstrate the concept of using injection of treated water as an option for groundwater replenishment.
Show less - Date Issued
- 2014
- PURL
- http://purl.flvc.org/fau/fd/FA00004317, http://purl.flvc.org/fau/fd/FA00004317
- Subject Headings
- Aquifer storage recovery, Artificial grounddwater recharge, Drinking water -- Contamination, Environmental health -- Mathematical models, Groundwater -- Pollution -- Mathematical models, Health risk assessment, Viral pollution of water
- Format
- Document (PDF)
- Title
- The correlations between OSTDS sites and the pollution of the surface water bodies in Broward County.
- Creator
- Rocher, Yvel, Bloetscher, Frederick, Florida Atlantic University, College of Engineering and Computer Science, Department of Civil, Environmental and Geomatics Engineering
- Abstract/Description
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Sampling data of many surface water bodies in Broward County tend to reveal abnormal levels of bacterial concentrations for total coliform, Escherichia coli and Enterococcus. Given the presence of septic systems in geohydrologically sensitive areas throughout the County, several studies (Morin 2005 and Bocca 2007) suggested a correlation in the high bacterial densities and the septic sites.
- Date Issued
- 2014
- PURL
- http://purl.flvc.org/fau/fd/FA00004324, http://purl.flvc.org/fau/fd/FA00004324
- Subject Headings
- Bacterial pollution of water, Groundwater -- Pollution, Pathogenic microorganisms -- Detection, Sewage disposal, Sewerage, Water -- Pollution -- Point source identification, Water quality -- Management
- Format
- Document (PDF)