Civil and Environmental Engineering Commons^™

Corrosion Behaviour Of Brass In The Vembanad Estuary, India, Andy Mathiazhagan, Rani Joseph, Kanjiramparayil Puthilon Narayanan, Palaniandy Seralathan

Journal of Marine Science and Technology–Taiwan

Corrosion characteristics of brass panels were investigated in the Vembanad estuarine water (Cochin Harbor), India over a period of one year. The corrosion rate of brass samples during exposure was determined by gravimetric method and fouling on panels was assessed, exposure-wise, in terms of biomass. Corrosion products were identified by X-Ray diffraction. The results of the study were discussed in the light of the seawater characteristics.

Optimal Estimation For Key Parameters Of The Marine Quality Model Using Data-Driven Neural Network, Ming-Chang Li, Shu-Xiu Liang, Zhao-Chen Sun, Guang-Yu Zhang

Journal of Marine Science and Technology–Taiwan

Marine water quality models are complicated because of their multi-parameter and multi-response characteristics. One major difficulty with water quality models is the accurate estimation of model parameters. In this paper, a new method based on a data-driven model (DDM) is developed to retrieve the value of model parameters. All training data are calculated by numerical water quality models from results of multiparameter matching design cases so the physical properties are not disturbed. The concept is to find the relationship between model parameters and the pollution concentration values of interior stations. Field data are imported into the relationship for inversing optimal …

Maintenance Algorithm And Management System Of Sidewalk Facility, Lee-Kuo Lin, Chen-You Jian

Journal of Marine Science and Technology–Taiwan

Sidewalk is one kind of infrastructure systems in each city, because every sidewalk facility is used by pedestrians, so the maintenance algorithm should be evaluated and worked with users’ role. To echo this reasonable concept, this research investigates several using influence factors, which were collected and evaluated from pedestrians. For statistical analysis, scientific tools including Delphi method, analytic hierarchy process (AHP), and fuzzy theory were used to analyze and establish a preliminary evaluation model of sidewalk maintenance system. In order to use this model pragmatically, this research also establishes a portable prototype system at PDA hardware. With this portable system, …

A Wide Speed Range Sensorless Control Technique Of Brushless Dc Motors For Electric Propulsors, Min-Fu Hsieh, Hung-Ju Liao

Journal of Marine Science and Technology–Taiwan

This paper presents a sensorless drive technique for permanent-magnet brushless DC motors applied to electric propulsors of small ships or underwater vehicles. Propulsors enveloping electric motors (e.g., POD or subsea thrusters) have been increasingly applied due to their advantages of excellent maneuverability, high efficiency and low maintenance costs. To secure reliable operation under water, sensorless control is considered as an appropriate technique. However, conventional sensorless techniques often suffer problems of narrow speed range and low efficiency, particularly when the propulsors sustain heavy load at high speed operation. Hence, a sensorless technique with a wide speed range is developed in this …

A Study Of Identifying Success Variables For Construction Partnering Via Sem Framework, Tung-Tsan Chen, Chih-Han Kao

Journal of Marine Science and Technology–Taiwan

Owners and contractors in construction partnerships cooperate to quickly achieve results with reduced start-up costs, achieve a win-win result for both parties, increase efficiency, and reduce the possibility of conflict in construction projects. This study explored success variables (SVs) in construction partnerships via a novel framework. A questionnaire survey was distributed to experienced practitioners in the Taiwan construction industry. Factor analysis was applied to extract SVs based on the questionnaire results. Structural equation modeling (SEM) was then used to verify the relationships between the SVs identified in construction partnership. The analytical results showed that four success factors (SFs) in construction …

The Study Of Ship Collision Avoidance Route Planning By Ant Colony Algorithm, Ming-Cheng Tsou, Chao-Kuang Hsueh

Journal of Marine Science and Technology–Taiwan

Maritime traffic is becoming more complex every day. At present, due to technological advances and to new maritime regulations, there is increasing demand for new nautical marine instruments to be installed into the bridge, and the breadth of navigational information complicates on-duty officers’ decisions. Therefore, if decision support tools can be used to help deal with navigational decision-making, human errors arising from subjective judgments can be reduced, and sea transport safety improved. This research uses the concept of e-navigation as a framework, positioning collision avoidance path planning as the main theme, and applies an Ant Colony Algorithm (ACA) in the …

Determination Of Interfaces In Soil Layers By Sound Wave Analysis With Cone Penetration Tests, Huei-Wen Chang, Tseng-Hung Chang, Viet-Tuong Nguyen, Chih-Wei Wang

Journal of Marine Science and Technology–Taiwan

This experimental study precisely identifies the soil layer interface using sound signals collected during cone penetration tests (CPTs). Using the high sensitivity of the sound sensor at the cone tip, this study effectively increases the accuracy in identifying the soil interface location. Shiluo sand and Jhongda Lateritic soil were used to construct large-scale soil layers. An acoustic CPT was applied to determine sound pressure and its root mean square (RMS). The Fourier spectrum and Hilbert-Huang transform (HHT) method were utilized and compared in their ability to analyze sound signals. The HHT method with a local energy-instantaneous frequencytime distribution performed well. …

Agenda: Opportunities And Obstacles To Reducing The Environmental Footprint Of Natural Gas Development In The Uintah Basin, Utah State University. Bingham Entrepreneurship And Energy Research Center, University Of Colorado Boulder. Natural Resources Law Center. Intermountain Oil And Gas Bmp Project, Houston Advanced Research Center. Environmentally Friendly Drilling Systems Program

Opportunities and Obstacles to Reducing the Environmental Footprint of Natural Gas Development in Uintah Basin (October 14)

A public workshop to discuss “Opportunities and Constraints to Reducing the Environmental Footprint of Natural Gas Development” was held in Vernal, Utah on October 14, 2010 at the Vernal campus of Utah State University. The workshop was sponsored by Utah State University, The Bingham Energy Research Center; The University of Colorado Natural Resources Law Center; and the Houston Advanced Research Center, Environmentally Friendly Drilling Program.

The meeting included presentations and panel discussions on:

• Trends and environmental issues related to natural gas development
• Examples of environmental innovations being used in the Uintah Basin
• Examples of innovation & tools from outside the …

Slides: A Working Model For Oil And Gas Produced Water Treatment, Lee Schafer

Opportunities and Obstacles to Reducing the Environmental Footprint of Natural Gas Development in Uintah Basin (October 14)

Presenter: Lee Schafer, Integrity Production Services, Inc., for Anticline Disposal LLC

11 slides

Slides: Assessing Opportunities And Barriers To Reducing The Environmental Footprint Of Oil And Gas Development In Utah, Douglas Jackson-Smith, Lorien Belton, Brian Gentry, Gene Theodori

Opportunities and Obstacles to Reducing the Environmental Footprint of Natural Gas Development in Uintah Basin (October 14)

Presenter: Dr. Douglas Jackson-Smith, Utah State University--Logan Campus

37 slides

Slides: The Environmentally Friendly Drilling Systems Program, David Burnett

Opportunities and Obstacles to Reducing the Environmental Footprint of Natural Gas Development in Uintah Basin (October 14)

Presenter: David Burnett, Texas A&M University and Houston Advanced Research Center

44 slides

Slides: Acts: Anadarko Completion Transport System, Jeff Dufresne

Opportunities and Obstacles to Reducing the Environmental Footprint of Natural Gas Development in Uintah Basin (October 14)

Presenter: Jeff Dufresne, Completions Manager, Anadarko Corporation

18 slides

Slides: Drilling Waste, Blake Scott

Opportunities and Obstacles to Reducing the Environmental Footprint of Natural Gas Development in Uintah Basin (October 14)

Presenter: Blake Scott, Scott Environmental Services, Inc.

24 slides

Slides: Intermountain Oil And Gas Bmp Project, Kathryn Mutz

Opportunities and Obstacles to Reducing the Environmental Footprint of Natural Gas Development in Uintah Basin (October 14)

Presenter: Kathryn Mutz, Natural Resources Law Center, University of Colorado at Boulder

21 slides

Slides: Enhanced Reclamation Program, Stephanie Tomkinson

Opportunities and Obstacles to Reducing the Environmental Footprint of Natural Gas Development in Uintah Basin (October 14)

Presenter: Stephanie Tomkinson, Senior Biologist, QEP Company

33 slides

Slides: Engaging Stakeholders, Duane Zavadil

Opportunities and Obstacles to Reducing the Environmental Footprint of Natural Gas Development in Uintah Basin (October 14)

Presenter: Duane Zavadil, Bill Barrett Corporation

5 slides

Slides: Geospatial Decision Support For Shale Gas Site Development, Malcolm Williamson, Jackson Cothren, Peter Smith

Opportunities and Obstacles to Reducing the Environmental Footprint of Natural Gas Development in Uintah Basin (October 14)

Presenter: Malcolm Williamson, Center for Advanced Spatial Technologies, University of Arkansas

50 slides

Reliability Estimation Of Complex Numerical Problems Using Modified Conditional Expectation Method, Christopher D. Eamon, Bulakorn Charumas

Civil and Environmental Engineering Faculty Research Publications

A simulation-based structural reliability analysis method is presented. It is intended as an alternate approach to estimate reliability for problems for which most-probable point of failure methods fail and when computational resources are limited. The proposed method combines conditional expectation and estimating the PDF or CDF of a selected portion of the limit state. In the proposed approach, complex limit state functions are simplified to two random variable problems. The success of the simplification depends on the quality of the CDF estimate. Results indicate that the method may provide accurate and efficient solutions for some difficult reliability problems.

Effects Of Thermal Gradient And Fines Content On Frost Heave Of An Alaska Base Material, Adam Ray Homewood

Theses and Dissertations

The objective of this research was to investigate the effects of thermal gradient and fines content and the interaction between these two factors on the frost heave characteristics of a typical Alaska base material. The laboratory frost heave testing involved one type of aggregate base material, three thermal gradients, and three fines contents in a full-factorial experimental design with two replicates. The aggregate was classified in the American Association of State Highway and Transportation Officials soil classification system as A-1-a; the thermal gradients were 0.15, 0.30, and 0.45 ºC/cm; and the fines contents were 6, 8, and 10 percent. After …

A Review Of Zero Discharge Wastewater Treatment Systems Using Reed Willow Bed Combinations In Ireland, Sean O'Hogain, Liam Mccarton, Anna Reid, John Turner

Conference papers

The concept of a reed willow bed combination has the potential to achieve a zero discharge wastewater treatment system. This paper will present results from a two year study to monitor the performance of a reed willow bed facility at Lynches Lane, Co. Dublin, Ireland. Outline design specifications for the facility will be presented. Monitoring results for a two year period including influent and effluent parameters, rainfall, potential evapotranspiration, and soil classification will be presented and discussed. During the two year monitoring period the system achieved a zero discharge. This paper will discuss the potential widespread application of similar systems …

Study Of Load Transfer Efficiency Of Airfield Rigid Pavement Joints Based On Stresses And Deflections, Ashish Wadkar

Theses and Dissertations

The concept of joint load transfer efficiency is very important and fundamental to Federal Aviation Administration's (FAA) airfield rigid pavement thickness design procedures. The FAA procedure assumes 25% of stress applied to the edge is transferred to the adjoining slab. Moreover, since it is not convenient or practical to measure stress-based load transfer efficiency [LTE (S)], field measurement of load transfer efficiency includes computation of the ratio of unloaded slab deflection to loaded slab deflection. Falling weight deflectometer (FWD) generally serves the purpose of measurement of deflection-based load transfer efficiency [LTE (6)]. The true load transfer is defined by stress …

Assessment Of State Recycling Regulations In The United States, Nazli Yesiller, James L. Hanson, Samuel A. Vigil

Civil and Environmental Engineering

This investigation was conducted to identify the current status of state recycling regulations in U.S. using an extensive survey. Questions were included regarding: baseline waste generation and recycling trends; recycling regulatory trends; quantitative thresholds; integration of science, engineering, and economic principles; material properties; and legislative status of regulations. The majority of the surveyed states had regulations for recycling activities, which were less strict than solid waste regulations, and required permits for operation of recycling facilities. A low percentage of the states regulated generators, transporters, and handlers and a high percentage regulated recyclers. In general, transfer stations and recycling centers were …

Ebec Phase Ii Wind Energy Project Feasibility Study: Asa Project 10-060, Final Report, Applied Science Associates, Inc.

East Bay Energy Consortium Documents

Subsequent to the Phase I preliminary wind energy feasibility and siting study EBEC contracted again with ASA to perform a Phase II study with the scope of performing a detailed feasibility study of developing a project at the Tiverton site. The detailed study, presented herein, evaluated the project size and layout options, siting considerations, procurement and development considerations, ownership structures, financing opportunities, and legislation considerations. The results are presented as four different options for EBEC to act as owner, developer and operator, evaluating the associated development cost and potential revenue streams as well as a third party developer owned and …

Scale Dependence Of Radar Rainfall Uncertainty: Initial Evaluation Of Nexrad's New Super-Resolution Data For Hydrologic Applications, Bong Chul Seo, Witold F. Krajewski

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

This study explores the scale effects of radar rainfall accumulation fields generated using the new super-resolution level II radar reflectivity data acquired by the Next Generation Weather Radar (NEXRAD) network of the Weather Surveillance Radar-1988 Doppler (WSR-88D) weather radars. Eleven months (May 2008-August 2009, exclusive of winter months) of high-density rain gauge network data are used to describe the uncertainty structure of radar rainfall and rain gauge representativeness with respect to five spatial scales (0.5, 1, 2, 4, and 8 km). While both uncertainties of gauge representativeness and radar rainfall show simple scaling behavior, the uncertainty of radar rainfall is …

A Junction And Drop-Shaft Boundary Conditions For Modeling Free Surface, Pressurized, And Mixed Free Surface-Pressurized Transient Flows, Arturo S. León, Xiaofeng Liu, Mohamed S. Ghidaoui, Arthur R. Schmidt, Marcelo H. García

Civil Engineering Faculty Publications and Presentations

A junction and drop-shaft boundary conditions (BCs) for one-dimensional modeling of transient flows in single-phase conditions (pure liquid) are formulated, implemented and their accuracy are evaluated using two Computational Fluid Dynamics (CFD) models. The BCs are formulated for the case when mixed flows are simulated using two sets of govern- ing equations, the Saint Venant equations for the free surface regions and the compressible water hammer equations for the pressurized regions. The proposed BCs handle all possible flow regimes and their combinations. The flow in each pipe can range from free surface to pressurized flow and the water depth at …

The Operation Of Hybrid Reed Bed And Willow Bed Combinations In Ireland - Zero Discharge And The Potential For No Monitoring Of Domestic Applications Of This Combination, Sean O'Hogain, Liam Mccarton

Conference papers

This paper will briefly trace the development of reed beds, the treatment mechanisms involved and the evolution of the more popular designs, with emphasis on the hybrid reed bed. It will also present a review of the concept of using willow beds to deal with waste water. It will examine the Danish guidelines. It will also review the application of willows to treat effluent from a hybrid reed bed system and the evolution of this system in Wales. The theory of willow bed treatment will also be discussed with particular emphasis on the factors that effect evapotranspiration. Two alternative designs …

A Realistic Technology And Engineering Assessment Of Algae Biofuel Production, T. J. Lundquist, I. C. Woertz, N. W. T. Quinn, J. R. Benemann

Civil and Environmental Engineering

This report assesses the economics of microalgae biofuels production through an analysis of five production scenarios. These scenarios, or cases, are based on technologies that currently exist or are expected to become available in the near-term, including raceway ponds for microalgae cultivation, bioflocculation for algae harvesting, and hexane for extraction of algae oil. Process flow diagrams, facility site layouts, and estimates for the capital and operations costs of each case were developed de novo. This report also reviews current and developing microalgae biofuel technologies for both oil and biogas production, provides an initial assessment of the US and California …

A Classification Tree Based Modeling Approach For Segment Related Crashes On Multilane Highways, Anurag Pande, Mohamed Abdel-Aty, Abhishek Das

Civil and Environmental Engineering

Introduction: This study presents a classification tree based alternative to crash frequency analysis for analyzing crashes on mid-block segments of multilane arterials.

Method: The traditional approach of modeling counts of crashes that occur over a period of time works well for intersection crashes where each intersection itself provides a well-defined unit over which to aggregate the crash data. However, in the case of mid-block segments the crash frequency based approach requires segmentation of the arterial corridor into segments of arbitrary lengths. In this study we have used random samples of time, day of week, and location (i.e., milepost) …

Halloysite Clay Nanotubes For Controlled Delivery Of Chemically Active Agents, Elshard Abdullayev

Doctoral Dissertations

In this work we explored the capabilities of halloysite nanotubes as capsules for encapsulation and controlled delivery of the chemically and biologically active substances. Halloysite is a two-layered aluminosilicate which has a predominantly hollow tubular structure in the submicron range and is chemically similar to kaolinite [1, 2].

In the first section of this work, we analyzed the structure of the halloysite nanotubes as well as its capability to encapsulate and deliver biologically and chemically active agents, similarities and differences between release characteristics of different agents and how these differences relate with their chemical structure. Models were used to describe …

Env Engineering Engagement, Maya Trotz

Service-Learning Syllabi

No abstract provided.