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Various empirical equations have been offered to facilitate the prediction of the concentration of pollutants in different phases in the environment. Using one such equation, Brown and Flagg (1981), the predicted separation between the...
ABSTRACT A limited number of studies using various types of cover materials to attenuate H2S emissions have been performed both at the laboratory and field scales. These results have demonstrated that H2S emissions can be effectively...
Due to shrinking federal, state, and local utility budgets, city management structures requiring more cost effect utility operating models, and ever more stringent environmental regulations requiring technical expertise, engineers are...
Microbial fuel cell (MFC) technology has been practiced in the treatment of landfill leachate. However, it is a big challenge for the usage of MFCs to treat landfill leachate with high ammonium content. The purpose of this study was to...
The purpose and focus of this research was on studying the hazard to Florida's coastal bridges from storm surge induced wave forces inflicted on the bridges during hurricanes. It has been observed in recent years that bridges located in...
Understanding the characteristics of probability distribution of extreme water levels is important for coastal flood mitigation and engineering design. In this study, frequency analysis has been conducted to investigate probability...
Vortex-Induced Vibration (VIV) in cables is a prevalent phenomenon affecting the structural health of bridges and their components. Past studies have shown both passive and active methods are beneficial in the reduction of vibrations, ...
Coral reef ecosystems provide essential goods and services to civilizations around theworld but are threatened by local and global anthropogenic disturbances. As we enter the United Nation’s Decade of Ocean Science for Sustainable...
High groundwater table exerts detrimental effects on the roadway base and the whole pavement. Base clearance guidelines have been developed to prevent water from entering the pavement system in order to reduce its detrimental effects....
Decay of waste within landfills is a contributing source to the greenhouse effect due to the production of methane. Larger landfills tend to have gas collection systems, which collect and convert gas into energy or flare it. Older and...
Developing Design and Evaluation Criteria for Transit Station with the Focus on Intermodal Connectivity Developing Design and Evaluation Criteriafor Transit Station
The continued population growth is continually challenging transportation officials to institute measures to meet travel needs at a desirable level of service. A customer-oriented transit service which provides intermodal travel would...
Chlorination of water is among the cheapest and mostly widely used drinking water disinfection methods. It also produces many disinfection by-products (DBPs) that are considered carcinogenic. DBPs are the result of chlorine reaction with...
This dissertation presents the work of groundwater long-term monitoring optimization based on an ant colony optimization algorithm and Bayesian analysis. Groundwater longterm monitoring (LTM) is required to assess human health and...
Landfills are the most widely used facilities for solid waste disposal. Landfill covers are used to reduce the quantity of water that infiltrates into solid waste landfills, isolate solid waste from the environment and control gas...
Wastewater collection systems and treatment facilities are known for emitting offensive odors that cause neighboring residents to complain. One of the main odor compound contributors is hydrogen sulfide (H2S). Presently, H2S removal from...
Colloid transport is believed to be controlled by their interactions with the porous media. The dominating forces are the electrostatic interactions that are determined by colloid surface charge density. Although it is well accepted that...
This research study examines the safety impacts of the existing operator hours of duty policies in the state of Florida. Thus, this study uses questionnaire surveys, incident data archived by transit agencies and bus driver schedules to...
The final discharge point for collected landfill leachates is frequently the local municipal wastewater treatment facility. The salinity, color, and/or nutrient and organics contamination of leachates often necessitate some form of pre...
Recent innovation in the engineered wood industry has produced Structural Composite Lumber (SCL) that tends to achieve maximum strength, stiffness and efficient use of wood. Product variations of SCL such as Laminated Veneer Lumber (LVL)...
Methane is one of two primary gases produced from the decomposition of landfill waste. Studies have been directed to collection and mitigation of methane gas. In small landfills, collection is not an economically feasible solution. Bio...
Calibration and Evaluation of Link Congestion Functions: Applying Intrinsic Sensitivity of Link Speed as a Practical Consideration to Heterogeneous Facility Types within Urban Network
This paper explores the use of archived data to calibrate volume delay functions (VDFs) and updates their input parameters (capacity and free-flow speed) for planning applications. The sensitivity analysis of speed to change in...
A standard deck is defined as a deck slab on longitudinal beams with main reinforcement placed perpendicular to traffic. As outlined in Article 9.6.1 of the AASHTO-LRFD Bridge Design Specifications, it allows three design methods or...
Buildings' Sustainability Analysis: Analytical Hierarchy Process to Analyze Cost, Leed Credits, and Carbon Neutrality Utilizing a Building Information Modeling Platform
For building owners, there are several factors that they must consider when thinking about whether or not a building has achieved the goals set up for it. With increases in energy prices, knowledge about the damage being done to our...
Local scour around a bridge pier (a cylinder) is a problem of much concern to hydraulic engineers. This is a complex phenomenon resulting from the interaction of the three-dimensional turbulent flow field around the cylinder and the...
Hot Mix Asphalt (HMA) is a viscoelastic material and has been broadly used in pavement structures. It is important to understand the mechanism of complex behaviors of HMA mixtures in field for improving pavement mechanical performance....
The purpose of this research is to assess the performance of an American Association of State Highway and Transportation Officials (AASHTO) girder bridge under blast loading. The AASHTO has specified probability based design methodology...
Federal, State, and local agencies use vehicle classification data for planning, design, and conducting safety and operational evaluation of highway facilities. The Federal Highway Administration (FHWA) Office of Highway Planning...
Modern prestressed reinforced concrete bridges are designed per LRFD standards, and are lighter with smaller safety factors. At the same time bridges are loaded with heavier vehicles with substantial masses when compared to the mass of...
Modeling traffic crashes is a complex undertaking. Previous research studies have used a variety of techniques to analyze crashes. Conventionally, traffic crashes have been modeled using regression models. Recently, intelligent systems...
The use of post-tensioning in bridge girders causes tensile bursting stresses to occur some distance ahead of the anchorage device in a region known as the general zone. Large amounts of mild steel reinforcement are placed in this area...
The use of biochar as a soil amendment for agricultural purposes in various cultures has been around for centuries, perhaps millennia. This study seeks to advance this practice by investigating the use of engineered biochar, by chemical...
This paper examines the application of Evolver, a genetic algorithm (GA) solving program, in a three-parameter optimization of a steel truss floor system with a concrete slab floor deck. The floor system is comprised of truss girders...
Parapets placed on bridge deck surfaces, commonly known as barriers, are purposely omitted from the structural analysis model for design or load rating. Barriers should not be considered primary structural members because they are...
Paratransit buses are custom built as the major vehicle manufacturer produces the custom built passenger cage installed on the chassis for the Paratransit bus. In order for these Paratransit bus members to be sufficient, they have to be...
Streams of the coastal plain were inventoried and surveyed for large woody material (LWM) in relationship with fluvial geomorphic characteristics. This empirical data was used to identify wood density based on stream channel hydraulic...
Elevated iron concentrations have been observed in the groundwater downgradient of the landfills in Northwest Florida. It is suspected microbial mediated iron reduction should be responsible for the iron release. The purpose of this...
Concrete is a poor conductor of heat due to its incombustible nature and low thermal diffusivity, which guarantee a slow propagation of thermal transients within the structural members. Despite exhibiting a good behavior at high...
Residential wastewater management in urban fringe and rural areas in northwest and north central Florida is commonly accomplished using on-site wastewater treatment systems (OWTSs), typically consisting of septic tank and drainfield...
Invasive plants are a nuisance and a hazard across the United States. Many states spend large amounts of money in an attempt to control and prevent the spread of these plants. This study seeks to take these invasive, low value plants and...
The Florida Department of Transportation (FDOT) is currently implementing the AASHTO Pontis® Bridge Management System (BMS) to support network-level and project-level decision making at the state and district levels. User cost models in...
The Federal Highway Administration's (FHWA) ``Every Day Counts'' initiative aims to shorten the overall project delivery time, enhance safety, and protect the environment both on and around construction projects. Using innovative...
Paratransit buses consist of a custom body mounted to a GM/Ford cutaway chassis by a secondary manufacturer called body builder. Paratransit buses form a significant segment of the bus market in the US nowadays. They are used as a...
The Florida Department of Transportation--Transit Office has endeavored to quantify the safety of a paratransit bus in a side impact collision. They have provided funded to produce this work. The goal of this work is to determine the...
There has been much research done on the reduction, or attenuation, of hydrogen sulfide (H2S), particularly within landfill cover soils, as H2S can cause many issues when exposed to the atmosphere. The objective of this research study...
The practice of posting minimum speed limits on rural Interstate freeways is predicated on the desire to reduce vehicle conflicts caused by speed variability in a traffic stream. In some states, minimum speed limit signs are posted on...
Older drivers may have more difficulty than the general driving public in attending to the driving task, and they may be slower at processing information, especially when required to make complex decisions. Traffic crashes caused by...
Land application is one of the natural treatment processes for raw or partially treated domestic wastewater. Examples include application of septic tank effluent to soil for subsurface infiltration, slow-rate (SR) wastewater irrigation, ...
Methane emissions from solid waste landfills are a significant portion of total anthropogenic greenhouse gas emissions. Present means of dealing with landfill gas emissions are too costly for many old and small landfills where gas...
Since 1984 the author has provided engineering services to property owners, insurance companies, attorneys, and others. The scope of those services typically included identifying the cause and origin of damage to residential and...
The increase in commodity flow and just-in-time pick up and delivery activities in urban areas have led to increase in truck traffic on urban roadways which raises safety and operational concerns. The concerns are related to trucks'...
Some of the material in is restricted to members of the community. By logging in, you may be able to gain additional access to certain collections or items. If you have questions about access or logging in, please use the form on the Contact Page.
